METHOD OF OPERATING A RADAR SYSTEM WHEN MEASURING THE SPEED OF AN UNMANNED AERIAL VEHICLE OF A SMALL CLASS OF MULTI-COPTER TYPE AND ITS RANGE Russian patent published in 2019 - IPC G01S13/52 

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to radar ranging and can be used to measure the speed of an unmanned aerial vehicle of a small class such as multi-copter (MC) and its range in far and near zones (FZ and NZ) relative to the protected object (PO). Method consists in generation of high-frequency sequence of probing pulses at carrier frequency f_c^(PD), amplification thereof, radiation with the help of the first receiving-transmitting antenna in the direction of the air target – multi-copter (AT-MC) during its initial flight in the FZ relative to the PO, reception, amplification, conversion of the reflected signals to intermediate frequencies, their selection by range and Doppler frequency, measured current range D_CUR to MC is compared to upper limit of range D_NZ near zone relative to PO, at D_CUR>D_NZ at radar system (RS) output values of MC flight speed and range are formed during RS operation in pulsed Doppler (PD) mode, at D_CUR=D_NZ in addition to the operating mode of the radar station, the mode of operation thereof with the probing signal continuous emission (CE), for which a continuously modulated high-frequency probing signal is generated with a carrier frequency f_c^(CE), its amplification and radiation with the help of the second receiving-transmitting antenna in the direction of the AT-MC during its flight in the NZ relative to the PO, receiving signals reflected from the MC, amplification thereof, conversion to intermediate frequencies and selecting a differential frequency signal f_d=(2F_mΔf_m D_CUR/c)+f_d^(CE), where F_m and Δf_m respectively modulation frequency and frequency deviation value; c is speed of light; f_d^(CE)=2Vf_c^(CE)/c is Doppler frequency, determined by MC flight speed V in radar station and operation of radar station in CE mode of probing signals, measurement of difference frequency f_d, compensation of Doppler frequency f_d^(CE) using radar operating in PD mode by introducing correction f_d^(CE)=f_c^(CE)f_d^(PD)/f_c^(PD), where f_d^(PD)=2Vf_c^(PD)/c is Doppler frequency determined by MC flight speed V and RS operation in PD mode, conversion of Doppler-compensated difference frequency f_dif^(c) in range to MC during its flight in NZ in accordance with expression D_CUR=c f_dif^(c)/2F_mΔf_m, formation during flight of MC in NZ relative to PO at RS output of values of speed of flight of MC during operation of RS in PD mode and distance to it during combined operation of RS in PD mode and mode with CE probing signal.

EFFECT: broader functional capabilities of a radar system which combines a pulsed Doppler (PD) radar station and a radar station with CE, when measuring the flight speed of MC and its range in the FZ and NZ relative to PO.

1 cl, 3 dwg