Device for processing phasonicularized radar signals

FIELD: radio engineering, communication.

SUBSTANCE: method is implemented by introducing a Doppler accumulation unit, a master signal generator, and (N-1) sub-optimal filters (where N is the number of Doppler channels) and performing phase-manipulated signal compression, taking into account the Doppler frequency shift.

EFFECT: preservation of the performance characteristics of the compression of phase-shifted radar signals in the presence of a Doppler frequency shift signal reflected from moving aircraft.

5 dwg

 



 

Same patents:

FIELD: radio, communication.

SUBSTANCE: emitting of pulse phase-code-manipulated (PCM) signals is carried out with the change in the code of the phase manipulation from period to period of sensing, receiving of reflected signals and their processing is carried out, and in each period of sensing one of two PCM signals matched with each other is emitted, which amplitudes of side lobes of autocorrelation functions are equal in module but have opposite signs, and the main peaks of the autocorrelation functions are equal. When receiving the reflected signals their compression is carried out for each sensing period separately to obtain readings of the compression results. The emitting, receiving and processing the PCM signals is carried out over two clock intervals, in one of which in each period of sensing the same PCM signal is emitted, and in the other clock interval two PCM signals are used, the emitting of which I carried out alternatively sequentially from period to period of sensing. Upon receipt of the compression results readings in both clock intervals for each obtained range element an N-point discrete Fourier transforming is carried out to obtain spectral readings (discrete spectrum). The discrete spectra obtained for each clock interval are compared, and thereby the components are isolated, relating to the main peaks (desired signal).

EFFECT: increase in resolving capacity of radar systems.

8 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used in radar stations with linear co-phased arrays. Quadrature components of the signal complex envelope are formed. Each of these components is subjected to conversion into a digital form, then the digital signal is distributed between the antenna elements of a co-phased array. After that, the signal is multiplied by the corresponding first complex coefficient in each of the antenna elements and then additionally multiplied by the second complex coefficient. Then the quadrature modulation of the signal is performed. Next, the signal is converted to an analogue form, amplified and radiated by an antenna element of the co-phased array.

EFFECT: expansion of the linear co-phased array bandwidth when forming the array pattern in a digital form and radiating a linear frequency modulated signal.

7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention may be used in radar stations with active phased antenna arrays (APAA) during digital beamforming and use as probing pulsed wideband chirp signals. In the transmit operating cycle of the APAA, quadrature components of the complex envelope of the chirp signal are generated; the signal is converted to digital in each quadrature component; the digital signal is distributed across antenna elements; the obtained signal is converted to analogue and its spectrum is transferred to the low frequency region, amplified and emitted by an antenna element to form a resultant beam pattern (for transmission); in the receive operating cycle of the APAA, signals received in each m-th antenna element are amplified; their complex envelopes are selected; the obtained complex envelopes of the signals are converted to digital; a resultant beam pattern (for transmission and reception) is obtained for each digital reading of the complex envelope of the received signal.

EFFECT: wider transmission band of an active phased antenna array during digital formation of its beam pattern for both transmission and reception and during use as a probing pulsed wideband chirp signal.

7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: emitted pulse consists of multiple time sections with serially varying duration; inside each time section, a quasirandom phase-modulated sequence of harmonic signal readings is generated and then converted to voltage which is passed through a low-pass filter which forms the modulation bandwidth ΔFm; from the output of filter, the signal is transferred to carrier frequency, power-amplified and transmitted to the antenna for radiation; reflected pulses received by the antenna are amplified, filtered at carrier frequency by a band-pass filter with transmission band ΔFm, time-sampled with frequency FD≥2ΔFm and level-quantised by an analogue-to-digital converter; the formed readings are transferred to zero frequency by digital quadrature heterodyning of a complex sinusoid with frequency ΔFm/2, and then filtered with a digital quadrature low-pass filter, readings at the output of which are formed with repetition frequency FS≥ΔFm and then processed with a compression filter, the pulse characteristic of which on duration, on the phase modulation function and on the expected Doppler frequency shift is matched with the reflected pulse, wherein the delay obtained at the output of the filter of maximum signal amplitude relative the beginning of the reception cycle corresponds to distance to the detected target, and frequency of the pulse characteristic at which maximum amplitude is obtained corresponds to Doppler shift of the frequency of the target, uniquely associated with its radial velocity.

EFFECT: measuring distance to targets with constant resolution in the entire range of distance and simultaneous measurement of radial velocities of targets when emitting one modulated pulse and when receiving reflected pulses, duration of which can be shorter than duration of the probing pulse.

24 dwg

FIELD: radio-location equipment, possible use for engineering of radio-location stations, meant for navigation and detection of targets.

SUBSTANCE: in detection method, modulated probing signals are generator and emitted, reflected signals are received and process, length of proving pulses and digit capacity of phase manipulation code is selected in accordance to certain conditions, with closing in of target parameters of probing pulses are changed, let-through bands of receipt device, complex circling line of binary-quantized signals after phase detection and joined compressed signal. Radio-location station has synchronization device 22, frequency readjustment block 8, exciting device 5, phase manipulator 4, power amplifier 3, antenna switch 2, antenna 1, high frequency amplifier 9, mixer 10, intermediate frequency amplifier 11, phase detectors block 12, video amplifiers block 13, amplifier quantizing devices block 14, adjustable discontinuous filters 181, 182, block for joining quadratures 19, antenna drives block 23, device for calculating Doppler frequency 17, code-frequency transformer 16, compensator of Doppler frequency 15, block for threshold generation 21.

EFFECT: improved concealment of probing emission, improved resistance to interference and ecological cleanness of radio-location station.

2 cl, 11 dwg

FIELD: computer science.

SUBSTANCE: device has first and second analog-digital converters, inputs of which are combined and are an input of device, and outputs are connected appropriately to inputs of first and second memory devices, digital signal processing processor, module of digital processors for processing signals for rough estimate of distance, generator of cyclic signal, containing serially joined first adder, third memory device and second adder. Output of first memory device is connected to first inputs of first adder of cyclic signal generator and signals processing microprocessor unit module, and output of second memory device is connected to their second inputs. Output of second adder of cyclic signal generator is connected to first input of digital signals processing microprocessor unit, to second input of which first output of signals processing microprocessor unit module is connected, second output of which and output of digital microprocessor unit for processing signals are, respectively, first and second device outputs.

EFFECT: simplified construction, lower costs, higher quality, higher efficiency.

5 dwg

The invention relates to the field of radio and can be used in the development of nonlinear radar for Executive electronic control devices explosion

Radar // 2170444
The invention relates to radar systems and can be used for radio navigation, in particular for navigation

Radar // 2131612
The invention relates to radar systems and can be used for radio navigation, in particular for navigation

FIELD: computer science.

SUBSTANCE: device has first and second analog-digital converters, inputs of which are combined and are an input of device, and outputs are connected appropriately to inputs of first and second memory devices, digital signal processing processor, module of digital processors for processing signals for rough estimate of distance, generator of cyclic signal, containing serially joined first adder, third memory device and second adder. Output of first memory device is connected to first inputs of first adder of cyclic signal generator and signals processing microprocessor unit module, and output of second memory device is connected to their second inputs. Output of second adder of cyclic signal generator is connected to first input of digital signals processing microprocessor unit, to second input of which first output of signals processing microprocessor unit module is connected, second output of which and output of digital microprocessor unit for processing signals are, respectively, first and second device outputs.

EFFECT: simplified construction, lower costs, higher quality, higher efficiency.

5 dwg

FIELD: radio-location equipment, possible use for engineering of radio-location stations, meant for navigation and detection of targets.

SUBSTANCE: in detection method, modulated probing signals are generator and emitted, reflected signals are received and process, length of proving pulses and digit capacity of phase manipulation code is selected in accordance to certain conditions, with closing in of target parameters of probing pulses are changed, let-through bands of receipt device, complex circling line of binary-quantized signals after phase detection and joined compressed signal. Radio-location station has synchronization device 22, frequency readjustment block 8, exciting device 5, phase manipulator 4, power amplifier 3, antenna switch 2, antenna 1, high frequency amplifier 9, mixer 10, intermediate frequency amplifier 11, phase detectors block 12, video amplifiers block 13, amplifier quantizing devices block 14, adjustable discontinuous filters 181, 182, block for joining quadratures 19, antenna drives block 23, device for calculating Doppler frequency 17, code-frequency transformer 16, compensator of Doppler frequency 15, block for threshold generation 21.

EFFECT: improved concealment of probing emission, improved resistance to interference and ecological cleanness of radio-location station.

2 cl, 11 dwg

FIELD: radio engineering, communication.

SUBSTANCE: emitted pulse consists of multiple time sections with serially varying duration; inside each time section, a quasirandom phase-modulated sequence of harmonic signal readings is generated and then converted to voltage which is passed through a low-pass filter which forms the modulation bandwidth ΔFm; from the output of filter, the signal is transferred to carrier frequency, power-amplified and transmitted to the antenna for radiation; reflected pulses received by the antenna are amplified, filtered at carrier frequency by a band-pass filter with transmission band ΔFm, time-sampled with frequency FD≥2ΔFm and level-quantised by an analogue-to-digital converter; the formed readings are transferred to zero frequency by digital quadrature heterodyning of a complex sinusoid with frequency ΔFm/2, and then filtered with a digital quadrature low-pass filter, readings at the output of which are formed with repetition frequency FS≥ΔFm and then processed with a compression filter, the pulse characteristic of which on duration, on the phase modulation function and on the expected Doppler frequency shift is matched with the reflected pulse, wherein the delay obtained at the output of the filter of maximum signal amplitude relative the beginning of the reception cycle corresponds to distance to the detected target, and frequency of the pulse characteristic at which maximum amplitude is obtained corresponds to Doppler shift of the frequency of the target, uniquely associated with its radial velocity.

EFFECT: measuring distance to targets with constant resolution in the entire range of distance and simultaneous measurement of radial velocities of targets when emitting one modulated pulse and when receiving reflected pulses, duration of which can be shorter than duration of the probing pulse.

24 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention may be used in radar stations with active phased antenna arrays (APAA) during digital beamforming and use as probing pulsed wideband chirp signals. In the transmit operating cycle of the APAA, quadrature components of the complex envelope of the chirp signal are generated; the signal is converted to digital in each quadrature component; the digital signal is distributed across antenna elements; the obtained signal is converted to analogue and its spectrum is transferred to the low frequency region, amplified and emitted by an antenna element to form a resultant beam pattern (for transmission); in the receive operating cycle of the APAA, signals received in each m-th antenna element are amplified; their complex envelopes are selected; the obtained complex envelopes of the signals are converted to digital; a resultant beam pattern (for transmission and reception) is obtained for each digital reading of the complex envelope of the received signal.

EFFECT: wider transmission band of an active phased antenna array during digital formation of its beam pattern for both transmission and reception and during use as a probing pulsed wideband chirp signal.

7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used in radar stations with linear co-phased arrays. Quadrature components of the signal complex envelope are formed. Each of these components is subjected to conversion into a digital form, then the digital signal is distributed between the antenna elements of a co-phased array. After that, the signal is multiplied by the corresponding first complex coefficient in each of the antenna elements and then additionally multiplied by the second complex coefficient. Then the quadrature modulation of the signal is performed. Next, the signal is converted to an analogue form, amplified and radiated by an antenna element of the co-phased array.

EFFECT: expansion of the linear co-phased array bandwidth when forming the array pattern in a digital form and radiating a linear frequency modulated signal.

7 dwg

FIELD: radio, communication.

SUBSTANCE: emitting of pulse phase-code-manipulated (PCM) signals is carried out with the change in the code of the phase manipulation from period to period of sensing, receiving of reflected signals and their processing is carried out, and in each period of sensing one of two PCM signals matched with each other is emitted, which amplitudes of side lobes of autocorrelation functions are equal in module but have opposite signs, and the main peaks of the autocorrelation functions are equal. When receiving the reflected signals their compression is carried out for each sensing period separately to obtain readings of the compression results. The emitting, receiving and processing the PCM signals is carried out over two clock intervals, in one of which in each period of sensing the same PCM signal is emitted, and in the other clock interval two PCM signals are used, the emitting of which I carried out alternatively sequentially from period to period of sensing. Upon receipt of the compression results readings in both clock intervals for each obtained range element an N-point discrete Fourier transforming is carried out to obtain spectral readings (discrete spectrum). The discrete spectra obtained for each clock interval are compared, and thereby the components are isolated, relating to the main peaks (desired signal).

EFFECT: increase in resolving capacity of radar systems.

8 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method is implemented by introducing a Doppler accumulation unit, a master signal generator, and (N-1) sub-optimal filters (where N is the number of Doppler channels) and performing phase-manipulated signal compression, taking into account the Doppler frequency shift.

EFFECT: preservation of the performance characteristics of the compression of phase-shifted radar signals in the presence of a Doppler frequency shift signal reflected from moving aircraft.

5 dwg

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