Station interference

 

(57) Abstract:

Usage: in electronics for the jamming pulse Doppler radar early warning. The inventive device for jamming device management and synchronization (UUS), dissipator, N switches channels, N devices for measuring time intervals. Improving the efficiency of the JV during the suppression of the pulse Doppler radar early warning is based on the peculiarities of its functioning, namely through the creation of intermittent interference. Information about the duration of operation of the pulse - Doppler radar early warning on each of the repetition frequency of the pulses from the output of the device for measuring time intervals of each frequency channel in the form of a parallel digital code is supplied to the device management and synchronization, which on the basis of this information produces a decision about the numbers and the sequence of jamming in these frequency channels, and the interference parameters. 5 Il.

The invention relates to electrical engineering and can be used for the jamming pulse Doppler radar early warning.

Known station radiopro-transmitting antenna switch the transfer pulse generator transceiver, UHF mixer of the receiver if amplifier, limiter, discriminator, cascades of sound frequency, a frequency discriminator, a modulator, an oscillator, a high frequency circuit, the transmitter mixer, the intermediate frequency generator, a modulator, a frequency modulator, which produces alternating turning on the transmitter and receiver, allowing the receiver frequency detection signal station of the enemy and providing automatic frequency transmitter to the frequency of the received signal.

A disadvantage of the known station interference (JV) is the low channels, as in the situation when the directivity of the antenna (BOTTOM) JV is multiple radars operating at different frequencies will be suppressed only one of them.

Also known electronic jamming (U.S. Patent N 4307400, CL G 01 S 13/40, 22.12.81) containing a receiving antenna, a receiver, a filter, a generator of a continuous signal, the detector signals, pulse generator, a Gating scheme, transmitting antenna provides a CW signal at the operating frequency of the radar, interrupted synchronously with each peri electronic jamming, she single-channel to serve purposes in circumstances where the BOTTOM can be several of them.

The closest in technical essence to the proposed JV is a multichannel automated device for jamming radar stations (U.S. Patent N 3896439, CL H 04 K 3/00, 31.10.55) containing the receiving antenna, the input switch, broadband UHF, which is both a source of thermal noise generated continuously over the entire operating frequency range of the receiver, splitter, the adder, the frequency channels with bandpass filters and key structure, consisting of a detector, amplifier, shaper gate control, as well as the key switch circuit, driver strobe, switch, output UHF and transmitting antenna and the output of the input switch, the first input connected to the output of the receiving antenna and a second input connected to the first output of the shaper strobe connected to the input of a broadband UHF, the output of which is connected to the input of the splitter and the input of the switch, the output of which is connected to the first input of the output UHF, the output of which is connected to the transmitting antenna, the second input of the output UHF linked with moves N bandpass filters, the outputs are connected to respective channel of the first input key switches circuits and detectors key circuits whose outputs are connected to inputs of the video amplifier of its channels, the first outputs of which are connected with inputs of forming gate control their channels, the outputs of which are connected to second inputs of the switches of the key schemes of their channels whose outputs are connected to respective inputs of adder signal, the output of which is connected to the first input of the output UHF.

The known device operates as follows.

The signals taken by the receiving antenna, through open exploration mode input switch, amplified UHF input, in accordance with its carrier frequency fall together with the noise signal in one of the frequency channels, where detected, amplified and fed to the gate driver control channel. Shaper gate control channel is composed of a threshold scheme, the threshold is set high enough to prevent accidental system start-up from noise. In response to the received signal, the amplitude of which exceeds a certain threshold level in the frequency designal interference is generated by modulation of the received signal radar thermal noise, subsequent summation of the signals in the adder and the gain in the output amplifier.

To provide isolation between the input and output circuits and control detected radar is alternately Gating the input switch and the output UHF. If you work more than one radar, but several, each on its frequency, it can be open simultaneously two or more frequency channels. This reduces the spectral power density of the interference, and thus decreases the efficiency of suppression of the radar.

An additional feature of this device is the ability to simultaneously create and barrage jamming. In this case, the noise source, which is used as an input amplifier, a switch may be connected directly to the output amplifier.

The disadvantage of this device is that it effectively creates interference airborne radar (radar), working in close frequencies (in one frequency channel). In the situation when at the BOTTOM of the JV is several radar and they work on different frequencies in different frequency channels), because of the increased width of the spectrum of the noise power density noise will be reduced.

Napoleoniche, posed by each of them, will be reduced in two times, and therefore, the range of suppression will decrease 1.4 times.

The invention improves the efficiency of the suppression pulse Doppler radar early warning, operating on different frequencies, without reducing the power density of the interference. The possibility of increasing the efficiency of the JV during the suppression of the pulse Doppler radar early warning is based on the peculiarities of their functioning by creating intermittent interference. For data RLS is characterized by the occurrence of the ambiguity of the measurement range of purposes due to the high pulse repetition rate. Resolving the ambiguity of the measurement range is achieved by using modulation of the transmitted signal (discrete change in the pulse repetition rate). It is a signal consisting of Z burst with its repetition frequency of the pulses. The definition of the range with multiple (usually two or three) fixed frequency pulse repetition requires consistent ambiguous measurement range for each frequency of recurrence with subsequent comparison of the measurement results and to eliminate ambiguity.

The need to detect the pressure pulse Doppler radar early warning by reducing below an acceptable quality of detection of at least one of these packages.

To achieve this effect, interference may be a response intermittent noise synchronized with the emission of one of the packs. The duration and repetition period of intermittent interference are selected from the condition

sup{ MiTci}zi=1CRTMiTciwhere z is the number of burst with his pulse repetition frequency (CPI);

Mithe number of pulses in the i-th bundle;

Tcithe repetition period of the pulses in the i-th bundle;

CRTCRthe duration and period of intermittent interference.

Mathematical modeling dependences of the probability of correct tracking of targets (Ponfrom the duty cycle intermittent interference (QCR) and the signal/interference // at z 3, M100, NC50 (number of goals), allowing to determine Qother protected areas.Tso opt/ other protected areas..

Pause intermittent noise enable (without reducing the power density of the interference) to create intermittent interference on other frequencies, which allows to increase the channels of the JV.

The purpose of the invention, is achieved by the fact that the device containing the receiving antenna, the input switch, broadband UV is tel, the adder frequency channels with bandpass filters and key structure, consisting of a detector, amplifier, shaper gate control, as well as the key switch circuit, driver strobe, switch, output UHF and transmitting antenna and the output of the input switch, the first input connected to the output of the receiving antenna and a second input connected to the first output of the shaper strobe connected to the input of a broadband UHF, the output of which is connected to the input of the splitter and the input of the switch, the output of which is connected to the first input of the output UHF, the output of which is connected to the transmitting antenna, second input of the UHF output connected to a second output of the shaper strobe, N outputs of the signal splitter connected to respective inputs of the N bandpass filters whose outputs are connected to respective channel of the first input key switches circuits and detectors key circuits whose outputs are connected to inputs of the video amplifier of its channels, the first outputs of which are connected with inputs of forming gate control their channels, the outputs of which are connected to second inputs of the switches of the key schemes of their channels, the output of the adder signal is, switches channels, N devices for measuring time intervals, each of which consists of M channels of the measurement periods of repetition of the pulses, and each channel of the measurement periods of the pulse repetition consists of a delay line for pulse repetition period, schemes And schemes OR coding devices, and in each frequency channel to the second output of the amplifier is connected to the inputs of the delay lines and the first inputs of the circuits And all M channels of the device for measuring time intervals, the output of the delay line is connected to a second input circuit, And the output of which is connected to the first input of encoder his channel measurement of the periods of repetition of the pulses and inputs (M 1) schemes OR other channels of measurement of the periods of repetition of the pulses, the outputs of which are connected with the second input of the coding device of their channels measurement of the periods of repetition of the pulses, the outputs are in the form of parallel digital codes connected with the corresponding frequency channel inputs UUS, the first output of which is connected to the input of the decoder, the N outputs of which are connected with the first inputs of the switches of the channels of the respective frequency channels, the outputs of which are connected with the corresponding frequency is Nala, second, third and fourth outputs of the MCU is connected with the third, fourth and fifth inputs of the coding devices all M channels of the measurement periods of the pulse repetition all N frequency channels, respectively.

The proposed JV contains known and widely used in practice elements. In particular, delay lines, schemes And schemes, OR encoders, decoder, can be implemented based on standard elements. As UUS can be used by the computer based on a microprocessor TO BM 86.

The newly introduced elements provide while in the BOTTOM JV multiple pulse Doppler radar early warning working at different frequencies, their consistent suppression intermittent noise synchronized with the emission of one of the packs each radar interference.

This positive effect is to increase the efficiency of the JV by increasing its channeling of the suppression pulse Doppler radar early warning, held simultaneously in the BOTTOM of the JV and operating at different frequencies due to the use of all the distinctive signs. This set of distinctive priznaki the new radar, there were no comments.

In Fig.1 shows the proposed JV, General view; Fig.2 the unit of measurement of time intervals; Fig.3 the encoder of Fig.4 the dependence of the probability of correct tracking of targets on the duration and repetition period of intermittent interference, where RPSthe probability of correct tracking of targets (the ratio of the average number of correctly tracked targets to the total number of goals);

CRthe duration of the intermittent interference;

TCRthe repetition period of intermittent interference;

QCRduty cycle intermittent interference

(QCR=1/=TCR/CR);

the signal-to-noise ratio.

In Fig. 5 the algorithm for determining the parameters of noise intermittent noise (l the number of suppressed radar; m(l) numbers of frequency channels;n(l) the duration of the intermittent interference; TAvethe repetition period of intermittent interference).

The proposed JV contains a receiving antenna 1 for receiving signals of the pulse-Doppler radar early warning, its output connected to the first input of the input switch 2; input 2 switch for locking the receiver at the time of radiation interference transmitter noise, its output connected to the input of the UHF 3, the second input sedimenting 1 signals, which is also the source of thermal noise, its output connected to the input of switch 4 and the input of the signal splitter 5; switch 4 to connect the UHF 3, which is a source of thermal noise to the first input of the output UHF 13 in create mode barrage jamming;

the signal splitter 5 to the input signal to the inputs of bandpass filters 6, N its outputs connected to respective N inputs of bandpass filters 6;

bandpass filters 6 for dividing the input signal by their carrier frequency, their outputs connected to first inputs of the switches of the key schemes 10 frequency channels and detectors key schemes 7 frequency channels;

the key detector circuit 7 for detecting an input signal of a given frequency channel, its output connected to the input of the amplifier 8;

amplifier 8 for amplifying detected signal are being shown, its first output connected to the input of the shaper gate control 9, a second output connected to the input of the measurement of time intervals 16;

the gate driver control 9, having in its composition a threshold scheme, the threshold is set high enough that prevents what about the output connected to the second input of the key switch circuit 10 of this frequency channel;

the key switch circuit 10 to control the frequency of the channel under the influence of the received radar signals exceeding the threshold gate driver control 9, and its output connected to the second input of the switch channel 18;

the decoder 11 for recognition code combinations and control the operation of the switches of the channels 18, its N outputs connected to first inputs of respective switches of the channels 18;

the adder signals 12 for supplying signals of frequency channels at the first input of the output UHF 13;

output UHF 13 to enhance the interfering signal, its output connected to the input of the transmitting antenna 15, the second input is connected to the second output of the shaper strobe 14;

shaper strobe 14 to provide alternate Gating admissions (intelligence and analysis) and transmitting subsystems (suppression);

the transmitting antenna 15 for radiation noise and interference signals in the direction explored pulse Doppler radar early warning;

the unit of measurement of time intervals 16 for separating signals according to the period in which they replicate, determine the duration of the operation of the pulse-Doppler radar early warning on each repetition frequencies in the form of digits is 17;

UUS 17 to control the operation of the frequency channels and the formation of interference parameters, its first output connected to the input of the decoder 11, the second output from the third input, a third output from the fourth output, the fourth output from the fifth inputs of the coding device 16-3 all channels;

the channel switch 18 to unlock the frequency channel under the influence of the control signal from the decoder 11, and its output is connected with the corresponding frequency channel input of the adder 12.

The proposed JV is as follows.

The signals taken by the receiving antenna 1 through the opened in exploration mode input switch 2, amplified UHF input 3, in accordance with its carrier frequency through a band-pass filter 6, get together with the noise signal in one of the frequency channels, where are detected by the detector 7, amplified WAC 8 and come to the gate driver control channel 9 and the unit of measurement of time intervals of the channel 16. In response to the received signal, the amplitude of which exceeds a certain threshold level of gate driver control 9, in this frequency channel is the closure of the key switch circuit 10.

In the unit of measurement of time intervalley delay varies and ranges from minimum to maximum CPI pulse Doppler radar early warning increments, equal to the pulse duration of this radar.

The pulses appear at the output of the circuit And 16-2, which will be the same periods of the pulse repetition radar and delay time3.

Thus, the two (three) the outputs of circuits And 16-2 (determined by the applied pulse-Doppler radar early warning number of CPI) are formed sequentially in time sequence of pulses that differ from each other by the pulse repetition period.

Pulse one CPI arrive at the input of the coding device 16-3 your channel measurement periods of the pulse repetition device for measuring time intervals 16 of this channel, as well as on the inputs (M 1) schemes OR 16-4 other channels measurement periods of the pulse repetition device for measuring time intervals 16 of the channel and further to the second inputs of the remaining (M 1) coding devices 16-3 device for measuring time intervals 16 of this channel.

Received at the first input of the coding device 16-3 device for measuring time intervals of 16 pulses at the input S of the trigger 16-3-1 and pulses are "beginning" of the encoded time interval. Pulses postupivshij R trigger 16-3-1 and pulses are the "end" of the encoded time frame.

The pulses of one of CPI as pulses "start" encoding time interval for one of the coding device 16-3, pulses are "the end" encoding of time intervals for the rest of the coding device 16-3 given frequency channel due to the fact that the sequence of pulses at different CPI follow sequentially in time and pass through different channels for the measurement of the periods of repetition of the pulses of a given frequency channel.

The output trigger signal 16-3-1 encoding device 16-3 has the form of a rectangular pulse with amplitude equal to the logical level "1", and the same duration as the coded frame. The specified pulse from the output Q of the trigger 16-3-1 arrives at the first input schema matching 16-3-2 encoding device 16-3. The pulses of the clock generator with a repetition period of Tgdo UUS 17 to the fourth input of the coding device 16-3 and serves to the second input schema matching 16-3-2. The output of the circuit matches 16-3-2 transmitted only those pulses of the clock sequence, which coincide in time with the pulse trigger 16-3-1. Further transformation of the signal is the number of pulses coming from the output of the circuit by sovjetskom encoding device 16-3, consisting of triggers 16-3-3.

The number of digits of the counter is selected based on the expected maximum duration of work on one CPI. Code written in triggers counter 16-3-3, through schema matching 16-3-4 is read by the signal reading coming from the MCU 17 to the fifth input of the coding device 16-3 and served on schema matching 16-3-4. Information about the duration of operation of the pulse-Doppler radar on each of CPI in this frequency channel in the form of a parallel digital code is supplied to a corresponding one of the M inputs associated with a given frequency channel, the MCU 17. Thus, a single frequency channel can flow into the MCU 17 encoded information about the duration of work on two (three) CPI pulse Doppler radar early warning. Similar information is supplied to corresponding inputs of the MCU 17 with other frequency channels.

In UUS 17 on the basis of information received from the frequency channels produces a solution (one of the options implemented algorithm in UUS 17 shown in Fig.5) the number of frequency channels on which there will be interference, and the interference parameters (duration, period) in each of the frequency channels suppressed.pdigital parallel codes, information about the numbers of frequency channels on the decoder 11. The decoder 11, by recognizing the code combination, provides a corresponding output control signal to the corresponding code combination switch channel 18. The duration of each control signal is determined by the duration of the interfering signal pfor this channel, a certain UUS 17.

Thus, the switch of the channel 18 of the corresponding channel will be open for a time equal to the duration and repetition period of the interference in this frequency band.

The interference signal is formed by modulating the received signal radar thermal noise, passing through the open switches key circuits 10, which adopted the signals, switches, channels 18, which has received the control signal from the decoder 11, subsequent summation of the signals in the adder 12, and the gain in the output UHF 13.

Intermittent noise disturbance from the output of the output UHF 13 is fed to the transmitting antenna 15 and is emitted in the direction of the suppressed pulse Doppler radar early warning. When applying for UUS 17 information about the operation of the pulse-goplerhavet the number of suppressed radar, the order of their suppression and settings intermittent interference in the frequency channel.

Thus, the invention lies in the exclusion of the reception pulse Doppler radar one burst its complex signal consisting of z packs, and thus the failure to unambiguously measure the distance to a target in the radar station.

This allows suppression of the short pulse Doppler radar early warning, operating on different frequencies and are in the BOTTOM of the JV without reducing the power density of the interference by rotating their suppression intermittent noise and clutter.

So for the prototype, for example, the simultaneous presence at the BOTTOM of the JV more than two working pulse Doppler radar at different frequencies will decrease more than twice posed by each of these power density of the interference, and hence, reduce the range of suppression of more than 1.4 times.

The suppression of the same number of pulse Doppler radar early warning in the same conditions of the proposed JV by rotating their suppression intermittent noise and clutter, the power density of the noise is not reduced and, therefore, does not decrease the range of suppression.

STATION INTERFERENCE, containing the receiving antenna, the input switch, broadband UHF splitter, the adder, the frequency channels with bandpass filters and key structure, consisting of a detector, amplifier, shaper gate control, as well as the key switch circuit, driver strobe, switch, output UHF and transmitting antenna and the output of the input switch connected to the first input with the output of the receiving antenna, a second input with the first output driver strobe connected to the input of a broadband UHF, the output of which is connected to the input of the splitter and switch, the output of which is connected to the first input of the output UHF, the output of which is connected to the transmitting antenna, the second input of the UHF output connected to a second output of the shaper strobe, N outputs of the splitter connected to respective inputs of the N bandpass filters frequency channels, each frequency channel output bandpass filter connected to the first input of the key switch circuit and the detector, the output of which is connected to whoo connected to the second input of the key switch circuit, the output of the adder connected to the first input of the output UHF, characterized in that it introduced the device management and synchronization, the decoder, the N switches of channels, N devices for measuring time intervals, each of which consists of M channels of the measurement periods of repetition of the pulses, and each channel of the measurement periods of the pulse repetition consists of a delay line for pulse repetition period, schemes And schemes OR coding devices, and in each frequency channel to the second output of the amplifier is connected to the inputs of the delay lines and the first inputs of the circuits And all M channels of the device for measuring time intervals, in each of the M channels, the output of the delay line is connected to the second input circuit And the output of which is connected to the first input of the coding device and to the corresponding inputs of the circuits OR other M-1 channels, the output of the circuit OR connected to a second input of the coding device, and outputs the coding device M channels of the measurement periods of the pulse repetition connected with corresponding frequency channel M inputs device control and synchronization, the first output of which is connected to the input of the decoder, the N outputs of which are connected respectively to the first inputs of the respective frequency channel, and the output from the respective given frequency channel input of the adder, while the second, third and fourth outputs of the device management and synchronization are connected respectively with the third, fourth and fifth inputs of the coding device M channels of the measurement periods of the pulse repetition M frequency channels.

 

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