Radar signal detection system

FIELD: passive systems of detection of radar signals, in particular, remote antenna devices, applicable at equipment of floating facilities of various purpose.

SUBSTANCE: the radar signal detection system has a series-connected receiving antenna, input device, in which the received signals are divided into two frequency channels and amplified by microwave, receiving device including a unit of detectors of amplifiers of pulse and continuous signals, as well as two units of signal processing connected by means of an interface trunk of the series channel to the device of secondary processing, control and representation made on the basis of a computer.

EFFECT: expanded functional potentialities of the system that is attained due to the fact that the radar signal detection system has a series-connected receiving antenna, etc.

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The invention relates to passive systems of detection of radar signals, and in particular to systems with external antenna device, and can be used for equipping ships for various purposes.

Known passive-active radar system [1], the passive part of which contains an n-element receiving antenna, connected to a multichannel receiver, each channel contains connected in series amplifier high frequency, block frequency selection (bandpass filter), the unit of the amplitude detector and the block of the video amplifier. The outputs of the receiving device is connected to the block detection and measurement including units of quantization narrow-band signals of the respective frequency bands, random access memory and a decoder, coupled to the input of the survey (switching) unit detection and measurement, the output of which is connected with a secondary data processing.

The system provides a sectoral overview of the space in the horizontal plane, the detection of radio emission sources, assessing their intensities and determination of their azimuthal position.

The disadvantage of the system is its limited functionality, which is connected with its supporting role in the active-passive radiolocation the Noi station.

The closest analogue, taken as a prototype of the proposed system is the system of detection and object recognition [2].

The system prototype contains the antenna, the input device, which is split into two frequency channel and the amplification at high frequency, block detectors, amplifiers, pulsed and continuous signals and the signal processing unit, coupled to the secondary device processing and display via the interface line of the serial channel.

The disadvantage of the system prototype are limited frequency range (two fixed frequencies) and the limited capacity of the signal processing part of the parameter definition and classification of emitters. In addition, the system does not provide the detection and recognition of complex, such as phase-shift keyed signals.

The invention aims to expand the functionality of the system, detection of radar signals.

The invention consists in that in the detection of radar signals containing connected in series receiving antenna, an input device, which is the separation of the received signals in two frequency channel and the gain on the ultra-high frequency receiving device in the with block detectors, amplifiers, pulsed and continuous signals, and a signal processing unit connected through the interface line of the serial channel with the device of the secondary processing, control and display based on electronic computers, the input device is made with the additional possibility of modulation of continuous signals and is connected to the receiver via a long cable path, the receiving device further comprises sequentially connected to the inputs-outputs signals of the respective frequency channels channel correction block fading, channel block amplifiers and attenuators and block bandpass filters, which is the separation of the signals of each frequency channel into narrowband frequency ranges, as well as a measure of the instantaneous frequency of one and the other frequency channels whose inputs are connected to the corresponding outputs of the dual-block amplifiers and attenuators, block adjustment voltage compensation of the parasitic amplitude modulation noise, the outputs of which are connected with the corresponding compensation inputs of block detectors, amplifiers, pulsed and continuous signals, and the generator of the reference voltage, to the respective outputs of which are connected to the input modulation input devices support the moves of the block adjustment voltage compensation of the parasitic amplitude modulation noise and reference inputs of the block detectors, amplifiers, pulsed and continuous signals, information the input of which is connected to respective outputs of the block of bandpass filters, in addition to the above, in the system a second signal processing unit, similar to the first signal processing unit, each signal processing unit is designed for the primary processing of signals of the respective frequency channel and contains a digital signal processor, connected through a system interface main memory device, long-term storage device and the controller serial channel that is connected to the interface line of the serial channel, digital-to-analogue Converter connected to the output serial digital signal processor, measuring the parameters of the pulse signals by the number of narrowband frequency ranges frequency channel and multi-channel meter parameters of continuous signals, the information outputs are connected to respective inputs of the multiplexer associated with a digital signal processor through the interface line direct access, is connected to the register control signals and the parameter register block signals, highway controller direct access connected to the input-output signal sync is implementing a digital signal processor, outputs synchronization signals of measuring the parameters of the pulse signals and multi-parameter meter continuous signals and the input synchronization signal multiplexer, register control signals and register settings lock signals, in addition to the above, the signal processing unit contains the referee meter instantaneous frequency shaper addresses serially connected analog switch analog-to-digital Converter of continuous signals and the detector, and analog-to-digital converters pulse signals, the output of each of which is connected to the information input of the corresponding parameter meter pulse signals, and the input is connected to the input of the corresponding comparator and connected to the corresponding output pulse signal of the detection unit-pulse amplifiers and continuous signals, outputs a continuous signal which is connected to the corresponding inputs of the analog switch, a control input and an address input multi-parameter meter continuous signals connected to the output of the shaper address, the output of the analog-to-digital Converter continuous signals are directly connected to the information input multi-parameter meter continuous signals and the via detector - to input signal detection threshold input of the detector is connected to the corresponding multi-parameter meter continuous signals, and the output of the detector is connected also to the input of the continuous detection signals of the resolver measuring the instantaneous frequency corresponding to the input of which the signal detection pulse signals are combined with the same inputs of the respective measuring the parameters of the pulse signals and is connected to the outputs of the respective Comparators and threshold inputs of the Comparators are connected to respective outputs of the first group of outputs of the digital to analogue Converter, the second group of outputs of which are connected with inputs of the voltage compensation unit adjusting voltage compensation of the parasitic amplitude modulation of noise, the control input of which a switch-off signal compensation connected to the corresponding output register control signals, the inputs of measuring the parameters of the pulse signals and multi-parameter meter continuous signals according to the code signal frequency, the signal detection phase manipulation and photomanipulating the video signal connected to the same outputs of measuring the instantaneous frequency of the corresponding frequency channel, the output of the synchronization signal which is connected to the input synchro is Itachi resolver measuring the instantaneous frequency, outputs which signals permissions read codes frequency connected to the same input multi-parameter meter continuous signals and measures the parameters of the pulse signals, the inputs of the block are connected to respective outputs of the register settings of the lock signal, the output of register control signals for the switch-off signal modulation is connected to the control input of the generator reference voltages, and outputs the control signals attenuators input device connected to the corresponding inputs of the latter.

The invention is illustrated by drawings, which depict:

figure 1 - structural diagram of the system of detection of radar signals;

figure 2 - structural diagram of the input device;

figure 3 is a structural diagram for dual block correction attenuation;

4 is a block diagram of the detector-amplifier pulse and continuous signals;

5 is a block diagram of the block adjustment voltage compensation of the parasitic amplitude modulation noise;

6 is a block diagram of the measuring instantaneous frequency;

7 is a block diagram of the signal processing unit.

1 is a block diagram of detection of radar signals, the following notation:

1 - reception antenna, made in the form of Shirokov Lesnoy becouse antenna polarizer,

2 - input device

3 - receiving device,

4 - the longest cable path, which is the transmission of microwave signals and control signals and the modulation

5 - channel correction block attenuation (DBCS),

6 - channel block amplifiers and attenuators,

7 - block bandpass filters,

81, 81- attenuators,

91, 92- low-noise amplifiers (LNA),

101, 102- directional couplers,

111, 112- low-noise amplifiers,

121, 122- power splitters,

131, 132, 141, 142, 151, 152- bandpass filters

161, 162- low-noise amplifiers,

171, 172- power splitters,

18 is a block detectors, amplifiers, pulsed and continuous signals (remote control unit IP-NS),

191,..., 196detectors - amps pulsed and continuous signals (hereinafter referred to as a detector-amplifiers - Doo),

20 generator reference voltages (GON),

21 is a block adjustment voltage compensation of the parasitic amplitude modulation noise (hereinafter referred to as the block adjustment voltage compensation - RNA),

221, 222- measuring the instantaneous frequency of the first and second frequency channels, respectively,

23 - the primary processing device,

241, 242blocks about is abode signals of the first and second frequency channels, respectively,

25 - line interface serial channels

26 - device secondary processing, control and display,

27 - electronic computing machine, made in the form of a single-Board computer with a frame comprising operational and long-term storage devices, video and adapter digital I / o with galvanic separation for communication with the control panel

28 - indicating instrument,

29 control panel that includes a set of buttons for inputting control signals,

30 - unit external relations,

31 - interface trunk information exchange with external systems.

According to figure 1 receiving antenna 1 is connected with an input device 2, which is the separation of the received signals on two frequency channels (2 to 8 GHz 8 to 18 GHz) and the gain on the ultra-high frequency. The input device 2 is connected with the receiving device 3 through the longest cable path 4 (length of 10-12 m), and the output signals of the respective frequency channel is connected to the appropriate input channel block 5 correction of attenuation, which is sequentially connected to the channel unit 6 amplifiers and attenuators, and the corresponding outputs of the latter are connected with the inputs signals of the first and second frequency channels of the block 7 of bandpass filters.

In the first chaston the m channel dual-channel unit 6 amplifiers and attenuators are connected to the attenuator 8 1, low noise amplifier 91, a directional coupler 101, low noise amplifier 111and the divider 121power. Similarly, the second frequency channel contains connected in series attenuator 82, low noise amplifier 91, a directional coupler 102, low noise amplifier 112and the divider 122power. Second outputs of the directional couplers 101and 102connected to the inputs of the probes 221and 222the instantaneous frequency, respectively.

Unit 7 inputs of bandpass filters bandpass filters 131(2-4 GHz) and 141(4-8 GHz) connected to the outputs of the power splitter 121. To the output of the bandpass filter 141connected to the divider 171power to the second output of which through the LNA 161connected band-pass filter 151configured to frequency F1with the band ΔF1(F1±ΔF1). The first output of the divider 171power and outputs of bandpass filters 151, 131form a group of outputs of narrow-band signals in the range of the first frequency channel, which is connected to information inputs of the detector-amplifier 191, 192, 193block 18 DN IP-NS.

Similarly to the outputs of the power splitter 122in the second frequency channel is connected band-pass filters 132(8-GC) and 14 2(12-18 GHz), and to the output of the bandpass filter 142through the divider 172power and LNA 162connected band-pass filter 152configured to frequency F2with the band ΔF2(F2±ΔF2). The first output of the divider 172power and outputs of bandpass filters 152, 132, which are narrow-band signals in the frequency range of the second frequency channel, connected to information inputs of the detector-amplifier 194, 195and 196block 18 DN IP-NS.

To the first output of the generator 20 reference voltages connected to the input of the signal-modulation ("MOU") of the input device 2, to its second group of outputs connected to the inputs reference voltages (reference input) detector-amplifiers 191,..., 196(The"OPB,..., 6), and the third reference inputs ("Op", "Op") unit 21 of the adjustment voltage compensation, the outputs of which are connected to the compensation input ("COMPU,...DO") of the respective detectors amplifiers 191,..., 196.

The device 23 primary processing contains two block 241, 242signal processing, in which the primary processing of the signals of the respective frequency channels and the generation of control signals by the receiver. Each of the blocks 241, 242associated with the device 26 secondary processing, control indicatii through line interface 25 serial channel (for simplicity, the diagram of figure 1 shows one combined channel).

An information input unit 241processing signals from the first frequency channel, which serves pulse signals (BA1, BA2, BA3) and continuous signals (NSA, NSA, NSA), connected to respective outputs of the group of detector-amplifiers of the first frequency channel (191, 192, 193), and inputs the signal code frequency (Code f), the signal detection phase shift keying ("OBN. FM), phase-shift keyed signal (Video FM") and ready signal (sync) measuring the instantaneous frequency ("Sync. IMC") connected to the corresponding outputs of the meter 221the instantaneous frequency. The outputs of block 241signal processing, which generates control signals attenuators input module ("Wprintf") and the frequency-dividing module ("Oprators") of the first frequency channel of the input device 2 that is connected to the corresponding inputs of the latter. The output of block 241the switch-off signal compensation ("Otche-3") and outputs, which are generated voltage compensation ("U.1", "U.2", "U.3") for detector-amplifiers of the first frequency channel, connected to respective inputs of the block 21 adjustment voltage compensation, and an output at which a signal is generated to disable modulation ("Odlo")connected to the control input of the generator 20 of the reference voltage is response.

Similarly, the information input unit 242processing signals of the second frequency channel on which signals are "WE," "WE", "VA", "NSA", "NSA", "NSA, connected to the outputs of the detector-amplifier 194, 195, 196and inputs the signals "Code f", "UPD. FM", "FM Video", "Synchronic connected to the outputs of the meter 222the instantaneous frequency. The outputs of block 242the signals Otche-6", "U.4", "U.5", "U.6, connected to respective inputs of the block 21 adjustment voltage compensation, and outputs the signals Wprintw" and "Oprators" - to the corresponding inputs of the input device 2.

The device 26 of the secondary processing, the control unit contains a computer 27 is connected to an indicator device 28, the panel 29 of the control unit 30 external links that is connected to the interface line 25 consecutive channels and front-end highway 31 exchange of information with external systems.

The input device 2 is made according to the scheme given in figure 2, where indicated:

32 - input module (VM),

33 - frequency-dividing module (CRM),

34 - power splitter

35 is a lowpass filter (LPF),

36 - high-pass filter (HPF),

371, 372- terminators,

381, 382- attenuators input module,

391, 392- modulators,

40 , 402- low-noise amplifiers,

411, 412- attenuators frequency-dividing module,

421, 422- LNA,

431, 432- bandpass filters (PF).

As shown in figure 2, the input device 2 includes sequentially connected on two inputs-outputs (one or the other frequency channels) input module 32 and the frequency-dividing module 33.

In the input module 32 to the input of the divider 34 power is the input device 2. To the respective outputs of the divider 34 of the power of the connected low-pass filter 35 and 36 HPF. To the output of the LPF 35 is connected in series United limiter 371the attenuator 381the modulator 391and LNA 401and to the output of the HPF 36 is connected in series limiter 372the attenuator 382the modulator 392and LNA 402. The second inputs of the modulators 391and 392form input Mod input device 2 and the control input attenuators 381, 382its inputs the signals Wprintw" and "Wprintf".

The input attenuators 411412frequency-dividing module 33 is connected to the outputs of the LNA 401and 402respectively, and their control inputs comprise inputs of the input device 2 according to signals Oprators" and "Oprators". The outputs of the attenuators 411, 412connected respectively to the LNA 421 2connected to band-pass filters 431, 432the outputs are the outputs of the respective frequency channels of the input device 2.

Dual block 5 correction of attenuation (DBCS) is designed to compensate for high-frequency signals for transmitting over the cable route 4 alignment of the amplitude-frequency characteristics for the range.

An example implementation of a dual channel unit 5 correction of attenuation is shown in figure 3.

According to figure 3 DBCS 5 in each of the frequency channels contains consistently United correcting filter 441(442), the attenuator 451(452) and low noise amplifier 461(462). The reference inputs of the LNA 461, 462connected to the stabilizer 47 voltage, and outputs comprise outputs DBCS 5. (The scheme of power distribution does not relate directly to the invention and for simplicity are not shown).

The detector-amplifier 191,..., 196made equally in the scheme shown in figure 4.

The input of the detector amplifier 191(192,..., 196) is the input of the directional coupler 48. To the first output of the directional coupler through the detector 49 is connected pre-amplifier 50 covered by the feedback chain of the amplifier 51 and the block 52 for automatic adjustment of the gain is of the noise (the ORB). The output of pre-amplifier 50 is connected to the logarithmic amplifier 53, the output of which is formed a pulse signal "BA1" ("BA2",..., "V") of the respective frequency range.

The second output of the directional coupler 48 is connected circuit including serially connected low noise amplifier 54, the detector 55, the pre-amplifier 56 covered by the feedback chain of the amplifier 57 and block 58 BALL, the amplifier-limiter 59, logarithmic amplifier 60, block 61 sample-hold and filter 62 (400 Hz), the output of which is formed a continuous video signal "SA" ("NSA",..., "NSA") of the respective frequency range. Reference sign "OPB" ("APB",..., "OPB") of the detector-amplifier 191(192,...196) is the second input unit 61 selection, retention, and compensation "COMPU" ("COMPU",..., "COMPU") is the second input (reference voltage) of the logarithmic amplifier 60.

Block 21 of the adjustment voltage compensation of the parasitic amplitude modulation of the noise made by the scheme of figure 5, including the amplifiers 631,..., 636and the keys 641,..., 646, 651, 652.

According to figure 5, the inputs of the amplifiers 631,..., 636form inputs signal compensation "U1",..., "U.6 respectively block 21 RNA.

The reference input signal Op and operated the speaker input signal "Otche-3" block 21 RNA formed by the signal and control inputs key 65 1, the output of which is connected to control inputs of the keys 641, 642, 643signal inputs are connected to the outputs of the amplifiers 631, 632, 633respectively, and the outputs form the outputs of the block 21 RNA signals "COMPU", "COMPU" and "COMPU".

The reference input signal Op" and the control input signal "Otche-6" block 21 RNA formed by the signal and control inputs key 652, the output of which is connected to control inputs of the keys 644, 645, 646signal inputs are connected to the outputs of the amplifiers 634, 635and 636respectively, and the outputs form the outputs of the block 21 RNA signals "COMPU", "COMPU" and "COMPU".

Measures 221and 222the instantaneous frequency (IMC) made by the scheme shown in Fig.6, where indicated:

66 - bandpass filter,

67 - generator calibration frequency

68 - switch channels (primary and calibration),

69 - amplifier-limiter,

70 - multichannel power divider,

711,..., 715- frequency discriminatory,

721,..., 7210differential amplifiers

731,..., 7310- analog-to-digital converters (ADC),

74 - programmable memory (ROM),

75 - block detection of phase-shift keyed signals.

According to the SNO 6 to respective inputs of the switch 68 of the channels connected to the output of the generator 67 calibration frequency and the output of the bandpass filter 66, the entrance is the entrance IMC 221(222). The output of switch 68 channels via the amplifier-limiter 69 is connected to the multichannel input of the divider 70 power to the respective outputs of which are connected to the inputs of frequency discriminators 711,..., 715. The outputs of each frequency discriminator 711,..., 715on which are formed quadrature components of the reference (input) signal and the signal delayed relative to the reference, connected in series through the respective differential amplifiers 721,..., 7210and ADC 731,..., 7310connected to inputs of the ROM 74, the outputs of which are formed the signal code frequency Code "f" and the ready signal (sync) "Synchronic forming the same outputs IMC 221(222).

The outputs of one of the frequency discrimination (715connected also to the input of block 75 discovery phase manipulation, the outputs of which form the outputs IMC 221(222) signals ABNF" and "Video FM".

Blocks 241, 242signal processing designed to handle signals of the respective frequency channels and generating control signals for the receiver. Blocks 241, 242are identical and differ only in the presence of an additional signal Odlo, in which f is to reroutes at the output of either one, or the other of the blocks 241, 242.

Figure 7 example of circuit implementation of biofeedback 241mark:

76 - unit analog-to-digital converters, which includes three analog-to-digital Converter pulse signals,

77 - block Comparators, including three comparator

78 analog switch

79 - analog-to-digital Converter continuous signals,

80 - detector,

81 - shaper address,

821, 822, 823- measuring the parameters of the pulse signals

83 - multi meter settings continuous signals,

84 - resolver measuring the instantaneous frequency

85 - multiplexer,

86 - front line direct access

87 - highway controller direct access

88 - register settings lock signals

89 - register control signals,

90 - digital signal processor (DSP),

91 - random access memory (RAM),

92 long - term storage device (DZU),

93 controller serial channels

94 - system interface line,

95 - analog Converter (DAC),

96 - clock,

97 - synchronizer.

According to Fig.7. a digital signal processor 90 is connected via a system interface line 94 with the RAM 91, DZU 92 and the controller 93 consequently the x channel, connected to the interface line 25 of the serial channel. DAC 95 connected to the output of the serial interface DSP 90.

Information outputs of the probes 821, 822, 823the parameters of the pulse signals and multi-channel meter 83 parameters continuous signals connected to respective inputs of the multiplexer 95, which is connected with a digital signal processor 90 via interface line 86 direct access to which is connected also register 89 control signals and register 88 of the block signals. The outputs of the synchronization signals "plucked, produces C1", "CU2", "PPE" measures 821, 822, 823and synchronization signals SI NA 1-3 multi-meter 83 is connected to the controller 87 highway direct access, which is connected to the input / output synchronization signal digital signal processor 90 and the input synchronization signal of the multiplexer 85, register 88 of the block signals and register 89 control signals.

The input of each analog-to-digital Converter block 76 ADC, coupled to the input of the corresponding comparator unit 77 Comparators, forms the input pulse signal (BA1 BA2, BA3) of the respective frequency range biofeedback 241. The output of each ADC block 76, which is formed of wolmers the command code of the amplitude of the pulse signal of the respective frequency range, connected to the information input of the corresponding meter 821(822, 823parameters of pulse signal.

The inputs of the analog switch 78 form the information inputs biofeedback 241the signals NSA", "NSA", "NSA", its output is connected to the ADC 79, and its control input and address input multi-meter 83 parameters continuous signals connected to the output of the shaper 81 addresses. The output of the ADC 79 continuous signals, which are sequentially formed eight-digit codes amplitude continuous video signals of the respective frequency bands connected to the information input multi-meter 83 parameters of continuous signals and the input of the detector 80, the threshold input ("Threshold") which is connected to the corresponding multi-meter 83 parameters continuous signals.

The output of detector 80, which is formed by the detection signal continuous signal WITH NSA, connected to the same inputs multi-meter 83 parameters of continuous signals and the arbiter 84 measuring the instantaneous frequency corresponding to the input of which the signal detection pulse signals ("DC1", "CO2", "BD3") connected to the same inputs of the respective gauges 821, 822, 823the parameters of the pulse signals and connected to you is the od of the respective Comparators block 77 Comparators.

The threshold input of the comparator unit 77 is connected to the group of outputs of the digital to analogue Converter 95, on which are formed the signal detection threshold in the relevant frequency range (for simplicity, shows one line).

The second group of DAC outputs 95, which is formed of the voltage compensation "U.1", "U.2", "U.3 for transmission in block 21 RNA receptor, produces the same outputs biofeedback 241.

Inputs biofeedback 241the signals "Code f", "ABNF", "Video FM" formed by interconnected same inputs gauges 821, 822, 823the parameters of the pulse signals and multi-channel meter 83 parameters continuous signals whose inputs are the signals enable (confirm) read codes frequency Potvin 1", "Potvin 2", "Potvin 3" and "Potvin the national Assembly connected to the corresponding outputs of the arbiter 84 measuring the instantaneous frequency. The input signals of the lock "Bliss", "Bliss", "Bliss" measures 821, 822, 823pulse signals lock "BLS" multi-meter 83 continuous signals connected to respective outputs of the register 88 of the block signals.

The outputs of register 89 control signals, which are signals Odlo", "Otche-3", "Wprintf", "Oprators", the image of the t same outputs biofeedback 24 1.

The output of the clock generator 96 is connected to the input clock frequency controller 93 consecutive channels, digital signal processor 90 and synchronizer 97, the output of which is connected to the synchronization input of the shaper 81 address.

The detection of radar signals is as follows.

Accepted by the antenna 1 radar signals are received through the divider 34 power (see figure 2), the filter 35 of the lower frequencies and the filter 36 of the upper frequencies, which divide a signal frequency by two channels of reception: from 8 GHz and below and between 8 GHz and above. In each of the frequency channels, the signals are sent to the limiter 371, (372), which protects low-noise amplifier when receiving strong signals. Next, the signals are sent to the controlled attenuators 381(382), providing for incoming commands Wprintw", "Wprintf" the weakening of the signal by approximately 20 DB.

These signals control the attenuators are issued by the operator panel 29 of the control device 26 of the secondary processing, control and display, are formed in the computer 27 via the interface line 25 consecutive channels are transmitted in block 241, (242) signal processing, in which (see Fig.7) through the controller 93 serial channels on the system front-end highway 94 post the time in a digital signal processor 90, and from there through line 86 direct access to the control input of the corresponding register 89 control signals, which control signal "Wprintf" ("Wprintf") is transmitted to the control input of the attenuator 381(382).

For the possible reception of continuous signals, microwave signals modulated semiconductor modulators 391, 392, control voltage "Mod" which comes from the output of the generator 20 reference voltages. The output signal of the modulator 391, 392come on low-noise amplifiers 401, 402that provide the necessary gain (30 dB), and then in the frequency-dividing module 33.

In CRM 33 received signals are sent to the controlled attenuators 411, 412that provide their attenuation by approximately 15 dB when entering commands Oprators", "Oprators". Team management attenuators 391, 392issued by the operator panel 29 control similar to the control signals attenuators input module. Further, the output signal of the attenuators through low-noise amplifiers 421, 422with a gain of about 20 dB and band-pass filters 431, 432emitting signals with a bandwidth of 2-8 GHz 8-18 GHz, proceed in the cable paths 4 transmission of microwave signals from the antenna and amplifier the disorder to the receiving device 3.

The passage of cable ducts with a length of 10-12 meters microwave signals have a significant weakening, uneven in the operating frequency range. To eliminate the effect of this non-uniformity dynamic range of the receiver is entered block 5 attenuation correction, equalizing the frequency response of the microwave paths (see figure 3).

Frequency response DBCS 5 is formed separately in the range of 2-8 GHz 8-18 GHz through corrective filters 441, 442contributing to the lower frequency range attenuation 10 dB greater than the upper frequency. With outputs correction filters 441, 442signals through the attenuators 451, 452(attenuation 6 dB) are fed to the inputs of low-noise amplifiers 461, 462providing the necessary gain at least 20 dB. Attenuators 451, 452provide isolation on inputs LNA 461, 462.

With outputs DBCS 5 microwave signals are fed to the inputs of a two-channel unit 6 amplifiers and attenuators, where after additional gain in the LNA 91, 92(15 dB) are fed to the directional couplers 101, 102served part of the power of microwave signals to the probes 221, 222the instantaneous frequency.

Another part of power after an additional gain LNA 111, 112(13 dB) cher is C the dividers 12 1, 122power is supplied to bandpass filters 131, 141, 132, 142that distinguish each frequency channel reception on the two narrow-band range: 2-4 GHz 4-8 GHz 8-12 GHz 12-18 GHz. This division provides instant detection of radiation in a wide frequency range and increases the sensitivity of the receiver. For the detection of weak signals in certain narrow areas of the frequency range, these areas are identified by dividers 171, 172power and bandpass filters 151, 152in a special receiving channels at frequencies F1±ΔF1and (F2±ΔF2). In these channels provide additional signal amplification by LNA 161, 162(10 dB). Thus, in block 7 of bandpass filters is allocated six narrowband frequency bands and each of the selected signals is introduced in the detector-amplifier 191,..., 196block 18 detectors, amplifiers, pulsed and continuous signals.

To obtain a high sensitivity receiver for continuous signals in the detector-amplifiers 191,..., 196method is used to separate detection and subsequent amplification of pulsed and continuous signals.

The input signal is divided in detec what the op amplifier 19 1(192,..., 196through the directional coupler 48 to the processing channels of pulse and continuous signals (see figure 4).

In the pulse channel microwave signals being received by the detector 49, proyektirovaniye signals are sent to pre-amplifier 50 with the circuit 52 BALL, then the logarithmic amplifier 53, the output of which is formed a pulse signal "BA1" ("BA2",..., "V") of the respective frequency range. Block 52 the BALL maintains a constant level of noise at the output of pre-amplifier 50 when changing the input noise level.

When processing continuous signals is further increased by LNA 54 with a gain of 10 dB, the detection by the detector 55. Proyektirovaniye signals are sent to pre-amplifier 56 with the circuit 58 BALL, then to the amplifier-limiter 59, logarithmic amplifier 60, block 61 sample-hold and filter 62 of the lower frequencies, the output of which is formed a narrow-band continuous video "NSA" of the respective frequency range.

Amplifier-limiter 59 prevents the infiltration of pulse signals well above the noise level in the channel processing continuous signals.

Block 61 sample-hold with a variable time constant and iltr 62 of the lower frequencies with a bandwidth of 400 Hz are synchronous detector, providing continuous demodulation of a signal modulated by a voltage Mod supplied to the modulator 39 generator 20 reference voltages. Block 61 sample-hold synchronously controlled by the reference voltage "OPB" ("APB",..., "OPB") from the generator 20 reference voltages, providing rapid increase of the output voltage in the intervals, when the modulator 39 input module 32 is open, and save the output voltage when closed modulator.

Preliminary and logarithmic video amplifier, as well as the ORB made in the form of specialized chips on the base of matrix crystals (BMC), which allows to significantly reduce the dimensions videocasting schemes receiving device and to realize a highly stable video amplifier with high gain.

Logarithmic amplifier 60 in the channel processing continuous signals has a special compensation input (second) for supplying the compensating voltage "COMPU" ("COMPU",..., "COMPU"), produced by the block 21 adjustment of voltage compensation.

The block 21 RNA is intended to provide a voltage compensation of the parasitic amplitude modulation (PAM) noise arising from the operation of the modulator and can lead to false continuous signal at the output of the detector-amplifier 191(19 ,..., 196).

The block 21 RNA (see figure 5) produces six of the compensation signals COMPU",..., "COMPU", each of which is intended for submission to a logarithmic amplifier 60 of the corresponding detector-amplifier 191,..., 196. The inputs "U.1",..., "U.6" block 21 RNA from digital to analogue converters 95 blocks 241, 242 signal processing receives a positive input voltage compensation (0 to 2), which with the help of amplifiers 631,..., 636amplified and converted into a range of values from-4V to +4V. Further, these voltage with key 641,..., 646and supplied to them through the public keys 651, 652the reference voltage "Op" ("Op") from the generator 20 reference voltages is converted into a square wave with a frequency modulation of the Mod and are fed to the inputs of compensation logarithmic video amplifier 60 detector-amplifiers 191,..., 196.

The polarity and amplitude of the output voltage compensation unit 21 RNA are set so that the sum on the logarithmic amplifier 60 compensating voltage and the signal spurious amplitude modulation were out of phase and equal in amplitude.

Installation of the compensating voltage "U.1",..., "U.6" is made when adjusting the receiving device 3 as part of the detection system is radiolokatsionnykh signals by filing with the panel 29 of the control units 24 1and 242code the amplitude of the voltage compensation via the interface line 25, the controller 93 serial channels on the system front-end highway 94 in a digital signal processor 90, which via the serial port - in d / a Converter 95.

Through the keys 651, 662block 21 RNA feed on their control inputs control signals Otche-3" ("Otche-6") from the panel 29 of the control unit 241(242) signal processing is done off of a compensating voltage at the time of incorporation of controlled attenuators 381, 382the input module 32, as this parasitic amplitude modulation noise is absent.

The generator 20 reference voltages synchronously generates the modulation signal Mod and the signals of support received at the reference input of the detector-amplifier 191,..., 196and block 21 RNA. The stop issuing and modulating the reference signal is control signal "Off. fashion.", issued by the operator panel 29 control via the interface line 25 consecutive channels in the block 241(or 242) processing signals, wherein said signal is transmitted via the system interface line 94 in DSP 90 and from there through line 86 direct access to the register 89 control signals, which will occupait on the control input GON 20. The system provides the possibility to use additional frequency modulation and reference signals (by programming).

The measurement of instantaneous carrier frequency of the microwave signal are implementing measures 221, 222the instantaneous frequency (see Fig.6).

The microwave signal received at the input IMC 221, (222after bandpass filter 66, limiting the operating range of the input frequency, is fed through switch 68 channels on the amplifier-limiter 69, providing amplification of signals at 55-60 dB and the limit signal amplitude, and further multi-channel divider 70 power, dividing the signal strength at several stages of measurement. The basic measurement elements IMC 221(222) are frequency discriminatory 711,... 715. Each frequency discriminator 71 contains a power splitter into two channels, one of which is the reference, and the other contains a delay line with a known time delay. In addition, each frequency discriminator has a phase detector, which measures the phase difference between the reference channel and the channel delay line. Delay lines provide a constant delay time regardless of its frequency, i.e. they are non-dispersive. Each phase detector provides the resolution phase is not more 11,25#x000B0; . The phase detector has two quadrature channels, each of which contains a directional coupler and two amplitude detector.

To obtain sufficient accuracy and unambiguity of the measurement frequency in the desired frequency range is used several stages of frequency measurement implemented by the collection of multiple frequency discriminators 711,..., 715containing a delay line multiple length. Discriminatory short delay lines provide unambiguous measurement frequency, and with a long delay line is the resolution and accuracy of frequency measurement. Each discriminator 711(712,..., 715) is connected to two differential amplifiers 721-722(723-724,..., 729-7210) with a frequency band of 10 MHz each, and a gain of 1000. After amplification and analog-to-digital conversion in the ADC 731,..., 7310the signals in the ROM 74, and from there to the inputs "f" measures 821, 822, 823the parameters of the pulse signals and multi-channel meter 83 parameters continuous signals in blocks 241, 242the signal processing.

ADC 731(732,..., 7310each discriminator produces non-positional code in Johnson or gray code) frequency (phase) of the signal, the low-order bits which use the SJ to disambiguate measure the frequency (phase) in the frequency discriminator with delay lines of smaller length.

In ROM 74 non-positional codes of each discrimination one INCH converted for no more than 200 NS in 12-bit binary position code of the frequency, while IMC 22 generates the ready signal (sync)is input to the synchronization input of the arbiter 84 measuring the instantaneous frequency of the block 241(242) signal processing. At the same arbitrator 84 IMC generates signals permissions read codes frequency for which the system is reading information from the ROM 74 and transfer it to the gauges 82 the parameters of the pulse signals and multi-channel meter 83 parameters continuous signals.

Block 75 detection of phase-shift keyed signals performs the recognition of the FM signals by counting the number of phase transitions (0°, 180°) and after a 10π-manipulation produces a signal "ABNF" to the inputs of the probes 82 the parameters of the pulse signals and the input of the meter 83 parameters continuous signals in the BOS 241(242). After that IMC 221(222) outputs a signal "Video FM" as a sequence of pulses coinciding in time with the shifting of the phase of the input signal.

Pulsed and continuous signals generated at the outputs of detectors, amplifiers 191, 192, 193the first frequency channel (2-8) GHz, proceed for further processing on the information input unit is 24 1processing signals and the video signals generated at the outputs of detectors, amplifiers 193, 194, 195the second frequency channel (8-18) GHz, arrive in BOS 242.

Each channel processing, the signal processing unit performs:

detection signal upon exceeding a constant detection threshold;

- measurement of pulse parameters: amplitude, duration, period, pulse sequence (only for pulse signals);

- define the lower and upper carrier frequency of a received signal, determining a characteristic linear frequency modulation;

- define the number of phase transitions of the FM signal;

- Association of pulses of one source packet assignment of identification numbers source;

- calculation of the averaged parameters of pulses in a packet;

- selection of the main lobe of the directivity diagram (DN) of the source and determine its width and time of occurrence;

- support signal source;

- formation forms with parameters of signal sources.

Block 241(242) signal processing operates as follows. (Hereinafter, for simplicity, an example of the operation unit 241).

After power-on signal from the control circuit (for simplicity not shown) is loaded programmatically-m is a thematic digital signal processor 90 of DZU (flash memory) 92. Then DSPS 90 through technological serial port SPORTO loads of programmable logic integrated circuits, which are implemented gauges 82, 83 of signal parameters, the configuration program stored in DZU 92. After that, the signal processing unit is ready for operation.

The pulse signals "BA1", "BA2", "BA3" from outputs of detectors, amplifiers 191, 192, 193proceed to the appropriate analog-to-digital converters block 76 ADC, which carry out the conversion of the amplitude in 8-bit code with tact 50 NS. The detection pulse signals to reduce the time delay is performed on the analog comparator block 77 Comparators. The threshold voltage detection is formed on the first group of outputs of the digital to analogue Converter 95 is running on a serial channel from the DSP 90. This allows manual (with panel 29 of the control device 26 of the secondary processing of information through the computer 27 and the block 30 external links further along the interface line 25, through the controller 93 serial channels and system interface highway 94 in DSPS 90) or automatic adjustment of the detection threshold.

Other DAC outputs 95 are used for forming the stress compensation (U comp, U comp, U comp) for block 21 RNA receiving device.

Continuous video is igrali "NSA", "NSA", "NSA" from outputs of detectors, amplifiers 191, 192, 193first, are fed to the analog switch 78 and further turns on the ADC 79. The detection of these signals is performed by code of the amplitude, which is transmitted to the input of the detector 80 of the ADC 89 synchronously with the signal Threshold of the multi-meter 83 settings and in synchronism with the address signal channel continuous signal, which is transmitted from the output of the shaper 81 address on the address input of the meter 83 and the control input of analog switch 78.

The logic of interaction with the meter 221the instantaneous frequency is implemented measures 82, 83 characteristics of signals to corresponding inputs of which receives 12-bit code of the instantaneous carrier frequency of the signal. Fixing code frequency is on the leading edge of signal detection "DC1", "CO2", "BD3", coming to 82 meters from the outputs of the block Comparators 77 and signals "NSA"from the meter 83 from the output of the detector 80. The presence of these signals in the respective frequency bands coming also to the inputs of the arbiter 84 measuring the instantaneous frequency, and the presence of a synchronization signal output IMC 221at the input of the synchronization arbitrator 84, the respective outputs of the resolver signals are formed "Podvig", "Podvig", "Podvig", "Potvin NA" is adresine (confirm) read codes frequency, arriving at the control inputs of the probes 821, 822, 823, 83. Next, the sample code frequency of this pulse is done with tact 300 not. In the case of simultaneous occurrence of signals in two or more channels of resolver 84 blocks the reading and notes such case, the special feature in the form of a pulse.

Measures 821, 82282383 parameters of pulse signals, virtually no bandwidth constraints, software-generated forms of the signals (time of arrival, amplitude, duration (pulse signal), the period of the pulse sequence, the carrier frequency), which through the multiplexer 85 is transmitted in a digital signal processor 90 through line 86 direct memory access.

To prevent overloading of DSPS 90 in conditions of excessive flow of signals from separate sources provided by the program rejectee signal parameters. Parameters resectively signals transmitted from the DSP 90 through line 86 direct access to the register 88 of the block signals and under control of the controller 87 highway direct access go to the inputs of block gauges 821, 82282383 signal parameters.

Software processing of signals from sources in the DSP 90 includes three phases: capture, with the formation of the primary form the source, measurement of parameters with the formation of the full form source and support with the periodic formation of a simplified form of the radiation source. In each of these stages, the following processing stages forms pulses. At first merge forms in packs of pulses from one source. The second is the clarification and measurement of parameters of signals in packs, in particular the definition of the parameters of the envelope packs: maximum amplitude, temporal position and width of the main lobe of the NAM. The third is the generation and transfer form with the parameters of the radiation source in the device 26 secondary data processing.

In the DSP 90 may be simultaneously processed signals to 255 sources. System software processing forms of the pulses is limited in bandwidth at the level of 100 thousand pulses per second.

Exchange of information with the device 26 secondary processing is performed on two highways 25 serial RS-422A through the controller 93 serial-type channels UART. Managing the exchange process is performed by computer 27. Messages contain or control commands data processing in the BOS 241, 242or control command receiving device 3 or contain a request for the transfer of the Fort is Ulanov signals.

The computer 27 carries out the formation and maintenance of forms, purposes, classification purposes by comparing the forms existing in the memory of a priori data (classification library), the secretion signal the presence of dangerous purpose, the generation of data for display on the display device 28, the formation and transfer of the blocks 24 of the signal processing control commands by the system.

In addition, provided communications system, detection of radar signals with external systems through the block 30 external links over the standard interface highways 31.

Thus, the proposed system provides reception, processing and classification of both continuous and pulsed and phase-shift keyed radar signals in a wide frequency range.

The introduction of the block attenuation correction eliminates distortion of the signal when passing long cable paths and to use the spatial remote from the equipment information processing antenna device that allows to take into account the structural features of the object that hosts the system, without compromising its performance.

Using the device information processing programmable logic elements, DSP, and standardized elements the evaluator is s systems provides high system performance allows you to extend the range of tasks and integrate the system into a single network of information provision and management of the object.

Presents drawings and description of the system allows using existing components, to make the industrial system and method to use to detect radar signals, which characterizes the present invention as industrially applicable.

References

1. RF patent №2124221, IPC G 01 S 13/42, publication 27.12.98,

2. RF patent №2166769, IPC G 01 S 13/02, publication 10.05.2001, the prototype.

The detection of radar signals containing connected in series receiving antenna, an input device, which is the separation of the received signals in two frequency channel and adjustable gain on the ultra-high frequency, and a receiving device, comprising a block detectors, amplifiers, pulsed and continuous signals, in addition, contains a signal processing unit connected through the interface line of the serial channel with the device of the secondary processing, control and display based on electronic computing machines, characterized in that the input device is made with the additional possibility of modulation of continuous signals, and its connection with receiving ustroystvo.ranee a long cable tract, the receiving device further comprises sequentially connected to the inputs-outputs signals of the respective frequency channels channel correction block fading, channel block amplifiers and attenuators and block bandpass filters, which is the separation of the signals of each frequency channel into narrowband frequency ranges, as well as a measure of the instantaneous frequency of one and the other frequency channels whose inputs are connected to the corresponding outputs of the dual-block amplifiers and attenuators, block adjustment voltage compensation of the parasitic amplitude modulation noise, the outputs of which are connected with the corresponding compensation inputs of block detectors, amplifiers, pulsed and continuous signals, and the generator reference voltages, corresponding to the outputs of which are connected to the input modulation input device, the control unit adjusting the voltage compensation of the parasitic amplitude modulation noise and reference inputs of the block detectors, amplifiers, pulsed and continuous signals, the information input of which is connected to respective outputs of the block of bandpass filters, in addition to the above, in the system a second signal processing unit connected through the interface line follower is on channel device secondary treatment, control and display, with each signal processing unit is designed for the primary processing of signals of the respective frequency channel and contains a digital signal processor, connected through a system interface main memory device, long-term storage device and the controller serial channel that is connected to the interface line of the serial channel, digital-to-analogue Converter connected to the output serial digital signal processor, measuring the parameters of the pulse signals by the number of narrowband frequency ranges frequency channel and multi-parameter meter continuous signals, the information outputs are connected to respective inputs of the multiplexer associated with a digital signal processor through the interface line direct access, connected to the register control signals and the parameter register block signals, highway controller direct access connected to the input / output synchronization signals of the digital signal processor outputs the synchronization signals of measuring the parameters of the pulse signals and multi-parameter meter continuous signals and input the mi synchronization signal multiplexer, register control signals and register settings lock signals, in addition to the above, each signal processing unit contains a clock generator, the clock, the referee meter instantaneous frequency shaper addresses serially connected analog switch analog-to-digital Converter of continuous signals and the detector continuous signals, and analog-to-digital converters pulse signals, the output of each of which is connected to the information input of the corresponding parameter meter pulse signals, and the input is connected to the input of the corresponding comparator and connected to the corresponding output pulse signal of the detection unit-amps pulsed and continuous signals, outputs a continuous signal which is connected to the corresponding inputs analog switch, the output of the analog-to-digital Converter continuous signals are directly connected to the information input multi-parameter meter continuous signals and through the detector continuous signals to the input of the detection signal, the threshold input of the detector continuous signals connected to the corresponding multi-parameter meter continuous signals, the output of detector continuous signals compounds is also input continuous detection signals of the resolver measuring the instantaneous frequency, corresponding inputs of which the signals of the detection pulse signals are combined with the same inputs of the respective measuring the parameters of the pulse signals and is connected to the outputs of the respective Comparators and threshold inputs of the Comparators are connected to respective outputs of the first group of outputs of the digital to analogue Converter, the second group of outputs of which are connected with inputs of the voltage compensation unit adjusting voltage compensation of the parasitic amplitude modulation of noise, the control input of which a switch-off signal compensation connected to the corresponding output register control signals, the output of which on a switch-off signal modulation is connected to the control input of the generator of the reference voltage inputs of measuring the parameters of the pulse signals and multi-parameter meter continuous signals according to the code signal frequency, the signal detection phase manipulation and photomanipulating the video signal connected to the same outputs of measuring the instantaneous frequency of the corresponding frequency channel, the output of the synchronization signal which is connected to the synchronization input of the resolver measuring the instantaneous frequency, the outputs of which signals permissions read codes frequency connected to the same inputs multichannel measure concentration of the El parameters of continuous signals and measuring the parameters of the pulse signals, the inputs of the block are connected to respective outputs of the register settings of the lock signal, the output clock generator connected to corresponding inputs of a controller of the serial channels, the digital signal processor and synchronizer, the output of which is connected to the synchronization input of the shaper address, and to the output of the shaper addresses connected to the control input of the analog switch and the address input multi-parameter meter continuous signals.



 

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