METHOD OF PULSE-DOPPLER RADAR AND DEVICE WITH AUTODYNE TRANSCEIVER FOR MONITORING TWO ZONES OF TARGET SELECTION BY RANGE Russian patent published in 2024 - IPC G01S13/18 G01S13/34 G01S13/42 G01S13/53 

FIELD: radar and radio navigation.

SUBSTANCE: invention relates to short-range radar systems (SRRS) designed to detect and determine motion parameters of targets in at least two range selection zones. Can be used in self-contained information-measuring systems as proximity sensors for detecting approaching targets, for example, in collision prevention systems of vehicles. Disclosed method consists in the fact that a high-frequency (HF) generator is impacted by a sequence of paired start-up pulses with steep fronts and oscillations coherent relative to frequency of triggering pulses are generated in HF generator during each radio pulse. Frequency of the first radio pulses of each pair is shifted relative to the frequency of the second radio pulses by an intermediate frequency (IF) value. Controlled space is irradiated with sounding radio pulses formed in the HF generator. Radio pulses reflected from near and far zones of targets are received from the first probing radio pulse of each pair. Oscillations of the received radio pulses are mixed with natural oscillations of the high-frequency generator, causing autodyne changes in the amplitude of oscillations, as well as current and/or voltage in the supply circuit of the high-frequency generator. Autodyne changes are selected in the form of video pulses of the near selection zone during formation of the first probing radio pulse and in the form of differential frequency (RF) radio pulses during formation of the second probing radio pulse. Radio frequency pulses are mixed with the reference IF oscillations in the mixer, converting the radio frequency pulses to the region of low Doppler frequencies in the form of video pulses of the far selection zone. Then, instantaneous values of the first and second video pulses are sampled separately and values of samples are used to obtain information on presence of targets in near and far selection zones, as well as distance and parameters of their movement. Disclosed device, which implements disclosed method, comprises HF generator connected to antenna, configured to electrically control the generation frequency, connected to the autodyne signal extraction device. Output of the latter is connected to the signal input of the signal switch (SS), the first output of which is connected to the mixer, and the second output is connected to the signal input of the second sampling-storage device (SSD). First output of the programmable synchronization and control unit (PBCU) is connected to the control input of the frequency of the high-frequency generator and the control input of the SS. Between the second output of the PBCU and the start-up input of the HF generator, an impact excitation pulse generator (IEPG) is introduced, the third output of the PBCU is connected to the heterodyne input of the mixer, the output of which is connected to the input of the first SSD. At the same time control inputs of the first and the second SSD are connected to the fourth and fifth outputs of the PBCU, respectively.

EFFECT: elimination of "dead zone" in close proximity to SRRS and formation of second (near) working selection zone in this range, which provides the possibility of detecting and determining movement parameters of a target both in the far selection zone and in the immediate vicinity of the SRRS.

9 cl, 4 dwg