Device for side lamps suppression at pulsed compression of symmetrically crossed multiphase codes (versions)

FIELD: radio engineering, communication.

SUBSTANCE: suppression of side lobes occurring during the compression process is performed, which provides an increase in the number of multiphase N-length codes, for all values of time shifts (counts), excluding two ±N, in which the relative level of the side lobes is in the range from -20 lgN -6 to -20 lgN -8 dB due to the use of symmetrically truncated codes formed by the consecutive removal of an equal number of first and last symbols of codes of a longer length. The width of the main lobe at -6 dB is 2τ, at the PSL level lies in the range 3÷4τ, and the signal-to-noise loss at the device output is -1.7 dB. The sidelobe suppression device for pulse compression of symmetrically truncated multiphase N-length codes comprises an input first digital filter with FIR of order N-1 and a digital correction signal generator consisting of a series-connected code converter into a complex conjugate code and a second digital filter with finite impulse response of order N+1, whose output is connected to the first input of the adder, and the output of the first digital filter is connected to a delay line for a duration of one to and the first input of the subtracter, the second input of which is connected to the output of the delay line, and the output is connected to the second input of the adder.

EFFECT: improving the quality of signal compression.

3 cl, 4 dwg

 



 

Same patents:

FIELD: radio engineering, communication.

SUBSTANCE: device includes adjustable generator 1, π/2 phase shifter 2, the first and the second phase detectors 3 and 4, the first and the second voltage comparators 5 and 6, signal polarity circuit 7, reversible counter 8, digital-to-analogue converter 9, the first adder 10, time delay line 11, integrator 12, EXCLUSIVE OR logic circuit 13, pulse shaper 14, signal multiplier 15, the first and the second units for raising the current voltage value to the second power 16 and 17, the second adder 18, unit for raising the current voltage value to 1/2 power 19, the first voltage divider 20 and the second scaling voltage divider 21.

EFFECT: complex improvement of the main parameters of a synchronisation system; enhanced interference immunity; improved filtering properties of the system; enlarging capture ranges and retaining a synchronous operating mode; reducing the beginning time of the synchronous operating mode; providing a zero static error as to phase and providing correct operation of the device under conditions of availability of changes and fluctuations of an input signal amplitude or changes in transmission factor of phase detectors.

3 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to frequency selection and filtration of radio signals. A selection method of radio signals consists in the fact that out of N selection circuits there chosen is a selection circuit with the widest band-pass, for which a suppressing signal is fully or the maximum possible part of its power is beyond its band-pass. If the suppressing signal is within the band-pass of the selection circuit with the narrowest band-pass, then a selection circuit with the widest band-pass is chosen. A device for determining the interference situation includes N selection circuits, N detectors, N-1 comparison units, N-1 or N threshold devices and a decision device with N-1 or N inputs. This device produces a selection signal of the selection circuit as per the specified method. A radio signal selection device includes N selection circuits and a controlled switch. With that, the decision device can control the choice of the selection circuit through control of the switch in accordance with the method.

EFFECT: technical result consists in the adaptation of radio signal selection devices to the interference situation, as well as a possibility of control of their power consumption.

24 cl, 15 dwg

FIELD: radio engineering, communication.

SUBSTANCE: digital synthesiser of double-level signals comprises a reference generator 1, a formation and delay unit 2, a first memory register 3, a digital storage 4, a first multiplexer 5, a second memory register 6, a third memory register 7, a variable-ratio divider 8, a counter 9, a second multiplexer 10, a fourth memory register 11. Inputs of the first, second, third and fourth memory registers are respectively the first, second, third and fourth digital inputs of the digital synthesiser of double-level signals, and the output of the first multiplexer is the digital output of said synthesiser.

EFFECT: enabling generation of packets of rectangular pulses with given pulse repetition, number of pulses per packet and repetition period of the pulse packets.

2 dwg

FIELD: radio engineering, communication.

SUBSTANCE: device includes two frequency-phase detectors (1 and 9), two low-pass filters (2 and 10), a voltage-controlled generator (3), a power splitter (4), a frequency divider (5), a low-frequency switch (6), a mixer (7), a reference frequency generator (8) and a control unit (12).

EFFECT: reduced level of phase noise in the output signal, frequency tuning time and level of parasitic spectral components.

3 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used in devices for transmitting analogue information flow over a packet communication channel (network). The result is achieved by increasing the period of the discriminator curve 2n times. The device comprises a low-pass filter and a code-controlled generator, as well as a record counter, a reading counter, two subtractors, an initial setting pulse former and a storage device. A 2n-1 constant (n is the counter capacity) is transmitted to the second (inverting) input of the second subtractor. The first input and output of the storage device are the data input and data output of the device, respectively, the clock pulse input of which is the first input of the record counter, and the output of the code-controlled generator is the clock pulse output of the device.

EFFECT: compensating for high clock pulse stray (jitter).

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: in one version, the side lobe suppression apparatus with pulsed compression of multi-phase codes of length N comprises a digital filter By for a code P3 and a digital correcting signal former, consisting of series-connected converter for converting a code to a complex-conjugate code and a finite impulse response (FIR) digital filter of the order N+1 with N+2 coefficients -1,1, 0,0,0, 1,-1, a delay line with delay equal to the duration of one code element m, an adder and a two-input subtractor. In another version, the side lobe suppression apparatus with pulsed compression of multi-phase codes of length N comprises, connected at the input, a digital filter By for a code P4 and a digital correcting signal former, a first adder, a delay line with delay equal to one code element m and a second two-input adder.

EFFECT: improved side lobe suppression with code compression.

2 cl, 3 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method of generating frequency and phase of an output signal of a controlled generator of a holding mode synchronisation unit involves, in synchronous operating mode, preliminary accumulation of sets of parameters which characterise the dependency of frequency deviation of the output signal of the controlled generator on ageing effects of the controlled generator and on ambient temperature changes; generating frequency and phase of the output signal of the controlled generator in holding mode by predicting frequency deviation of the output signal of the controlled generator from the initial value based on the accumulated sets of parameters, operation time in holding mode and current ambient temperature values, wherein the required changes in the digital control signal of the controlled generator are calculated based on the predicted frequency deviation values in order to compensate the predicted frequency deviation values and taking into account prediction of uncompensated frequency deviation.

EFFECT: high accuracy of generating a highly stable output signal of a controlled generator of a holding mode synchronisation unit.

4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: frequency grid synthesiser has a pulsed frequency-phase detector, a charge pumping current source, a capacitive element, a switching element, a control loop filter, voltage controlled generator, a fractionally variable ratio divider (FVRD), a division ratio control circuit in the FVRD, a fractionality compensation current source, the output of which is connected to the output of the charge pumping current source.

EFFECT: eliminating residual pulsations of fractionality noise in the control signal of a voltage-controlled generator.

7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: system for automatic adjustment of frequency of scattered lasers with a continuous radiation mode includes multiple coupled automatic frequency adjustment circuits, each including series-connected photomixer, discriminator, integrator and direct current amplifier connected to a piezoelectric corrector of the radiation frequency of the corresponding continuous wave laser, wherein one automatic frequency adjustment system from two continuous wave lasers is mounted on an artificial earth satellite which is fixed relative the earth, and the other two are mounted on the earth's surface.

EFFECT: enabling measurement of blue shift of monochromatic radiation of a powerful continuous wave laser which is aimed at the earth's surface from an artificial earth satellite which is fixed over a given point on the earth's surface due to the effect of the earth's gravitational field.

2 dwg

FIELD: information technologies.

SUBSTANCE: each unit of a network element blocks a signal of clock synchronisation of a unit of an upper level network element via a physical channel, and creates a network of clock synchronisation; each above unit of a network element uses a blocked signal of clock synchronisation for time count, and using this count, it executes time compensation for realisation of time synchronisation with the help of a network time protocol (NTP), besides, each unit of a network element applies a blocked clock signal for time count, and according to such count, it performs time compensation for realisation of clock synchronisation. Therefore a problem is solved in appropriate equipment, when a cumulative effect of phase transmission causes a too evident time delay, and the phase delay is reduced.

EFFECT: improved accuracy of time synchronisation and noise immunity.

10 cl, 7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radar, radio communication, radio navigation and radio control and can be used in radio electronic systems for detecting signals. The integrated device is a multichannel device and has, in each channel, a matched filter, two function generators, made in a certain manner, and a data transmission line, as well as an adder and a threshold device. The listed components are connected to each other in a certain manner.

EFFECT: smaller volume of transmitted information and high signal-to-noise ratio at the output of the device.

2 dwg

FIELD: weapons and ammunition.

SUBSTANCE: group of inventions relates to weapons systems. In the method of self-homing of missile with weapon to the target, the target is irradiated with the continuous signal with frequency modulation on unilateral sawtooth linear increase law (NLCHM signal). The NLCHM signals transmitted from the target are received with receiving antennas, which are arranged at the same distance from the axis of the missile on the circumference with the centre coinciding with the longitudinal axis of the missile, and in a perpendicular axis of the plane. The received and transmitted signals are multiplied twice, and differential signals are isolated twice. If the moments of detection of the signals do not coincide, the missile is moved to a position where they start to coincide. Then the missile is rotated by 90° around its longitudinal axis and the above operations are repeated until the moment when the signals start to be detected simultaneously. The missile with a self-homing device to the target comprises a radar station (RS) with the transmitting antenna, two receiving antennas, two mixers, two detectors of difference signal (DDS), two motors of correction (MC) of braking and acceleration, MC of turning of the missile by 90°, the means of attack (MA).

EFFECT: self-homing of missile to the target is ensured.

2 cl

FIELD: physics, optics.

SUBSTANCE: invention relates to laser engineering and can be used in optical location of high-speed objects. In a method for laser location of a mobile target, based on generating and receiving laser radiation reflected from a target, interference modulation of the received radiation, conversion thereof into an electrical signal and subsequent processing of the signal, interference modulation of the received radiation is carried out by mixing with radiation of the laser source, converting the modulated oscillations into an electrical signal and then into a digital code by sampling, performing spectral analysis of the obtained digital signal, measuring the Doppler velocity of the target, selecting a target by comparing the measured Doppler velocity of the target with a given velocity, calculated from predicted data, using the comparison results to determine presence of a target with given parameters in space, wherein calculation of the Doppler velocity of the target takes into account the results of measuring Doppler velocities of other targets, as well as deviation of the real trajectory of approach with the target from the predicted trajectory; converting the electrical signal into a digital code by sampling the signal with a period shorter than the period of the modulated oscillations.

EFFECT: high efficiency of optical location and selection of high-speed targets in an environment with interference.

3 cl, 2 dwg

FIELD: measurement equipment.

SUBSTANCE: inspected section of the road surface is probed by electromagnetic waves, the electromagnetic waves reflected from this surface section are received, the phase shift between the falling and reflected waves or change of amplitude (power) of the received waves is determined with reference to their values for the falling waves, respectively, the main phase shift of these waves or the main change of amplitude (power) of these waves in absence of the covering layer on the road surface is determined. A passive reflector of the falling electromagnetic waves reflecting them in the direction opposite to the direction of the probing waves is buit-in into the surface layer of the inspected section of the road. The sounding is performed by the fixed frequency electromagnetic waves at some angle other than a right angle, and by the size of additional phase shift with reference to the main phase shift or additional change of amplitude (power) of the received waves with reference to the main change of amplitude (power) of these waves the state of the road surface is obvious.

EFFECT: higher accuracy.

4 cl, 5 dwg

FIELD: physics, navigation.

SUBSTANCE: invention relates to radar and can be used in self-contained on-board radar aircraft landing control systems. The pulsed-phase radar altimeter system employs a direct method of measuring Doppler frequency by counting the number of periods thereof over a given time. The sign of the Doppler frequency is determined using the fact that the sign of the phase difference of quadrature components changes when the sign of the Doppler frequency changes. The pulsed-phase radar altimeter system comprises a discretely controlled microwave generator, a directional coupler, a pulse modulator, a phase-changer, a controlled attenuator, a circulator, a low-noise high frequency amplifier, a phase detector, a video amplifier, an analogue-to-digital converter, buffer random-access memory, a synchroniser, a computing device, an exchange controller, a gain adjustment unit, an attenuation adjustment unit, a current source, controlled voltage, a three-beam transceiving antenna, an antenna switch, an antenna switch control unit and a displacement computer. The listed devices are made and connected to each other in a certain manner.

EFFECT: broader functional capabilities owing to measurement of velocity vector components.

12 dwg

FIELD: measurement equipment.

SUBSTANCE: monitored section of the road surface is probed by electromagnetic waves along the normal line to its surface, the electromagnetic waves reflected from this surface section are received. Sounding is performed by fixed frequency electromagnetic waves, the probing and received electromagnetic waves are mixed, the main phase shift of these waves in absence of the covering layer on the road surface is pre-determined. Then the phase shift of these waves in presence of this layer is determined and by the value of additional phase shift with reference to the main phase shift the state of the road surface is obvious.

EFFECT: higher accuracy.

2 dwg

FIELD: radio-engineering, communication.

SUBSTANCE: current value of width of the selecting pulses Δt(i) is changes after each i detection of the reflected signals as Δt(i)≥Δt1+2Δtp(i-1), where Δtp(i-1) is average error signal between received reflected signal and reference signal upon accurate tracking during previous detection of the reflected signals at third stage.

EFFECT: increased reliability of the method of distance determination to earth surface due to adaptation of selecting pulses width to speed of change of time delay of the reflected signal at second sub-stage of signal detection of third stage.

FIELD: radio engineering, communication.

SUBSTANCE: in the method for protection from synchronous repeater jamming, based on using a longer probing period, upon detecting signals at distances exceeding the maximum radar detection range of a real target, said signals are considered repeater jamming signals, the features thereof are determined and used to detect said interference along with received signals at any range. Said result according to the first version is achieved also due to that the feature used is angular coordinates of the beginning and the end of the spatial packet of signals, angular coordinates of the centre of the spatial packet of signals and the strength of the interference signals. Said result according to the second version is achieved also due to that in the method for protection from pulsed interference, based on using a longer probing period, upon detecting signals at distances exceeding the radar detection range of a real target, said signals are considered interference, the phase difference thereof is measured at spaced-apart reception points and then used as the feature of the interference. The technical result of the second version is achieved due to that the phase difference is determined between signals received by main and auxiliary radar antennae.

EFFECT: generating features of pulsed, and particularly, synchronous repeater jamming and recognition thereof at any range.

6 cl

Adjustment shield // 2548690

FIELD: radio engineering, communication.

SUBSTANCE: adjustment shield simulates forward radio signals and radio signals specularly reflected from the earth, propagating from a missile and a target to a final homing area. The adjustment shield is located in the far zone of a radio direction-finding antenna and comprises laser and infrared emitters. To simulate signals from a missile transponder and signals reflected from a target, the shield is provided with a radio pulse generator with a frequency synthesiser.

EFFECT: high accuracy of adjustment.

3 dwg

FIELD: radio engineering, communication.

SUBSTANCE: disclosed is a reader of an object identification system. The reader comprises a receiving-transmitting antenna, a circulator, first and second directional couplers, a power amplifier, a high-frequency signal generator and a mixer. The receiving channel of the reader also includes a compensation device. The compensation device includes a vector modulator, a microcontroller, a high-frequency signal adder, a third coupler and a rectifier.

EFFECT: high sensitivity of the receiving channel of the receiving-transmitting circuit of the reader owing to the use of a compensation device, which compensates for parasitic reflected radiation in the receiving channel of the reader.

2 dwg

FIELD: medicine; medical engineering.

SUBSTANCE: device has scanner unit and transceiver unit allocated on objects belonging to risk group. The scanner unit has driving oscillator, power amplifier, circulator, transceiver antenna, high frequency amplifier, phase detector and computer. The transceiver unit is manufactured as piezocrystal with aluminum thin-film interdigitated converter covering its surface and connected to microstrip antenna and a set of reflectors. The interdigitated converter has two comb electrode systems covering acoustic duct surface. The electrodes belonging to each of the combs are connected to each other via busses. The busses are connected to the microstrip antenna in their turn.

EFFECT: wide range and field of functional applications.

2 cl, 3 dwg

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