Using frequency agility of carrier wave (G01S13/24)

Radar location method with carrier frequency tuning from pulse to pulse // 2628526
FIELD: radio engineering, communication.SUBSTANCE: radar location method with carrier frequency tuning from pulse to pulse consists in obtaining a signal of carrier frequency by direct heterodyning method of radio pulses of a fixed frequency up in frequency by the frequency value of the heterodyne signal and receiving the reflected signal by return heterodyning method by shifting it down in frequency, followed by filtering of the reflected signal at frequency of radio pulses of a fixed frequency by a frequency-selective device. Carrier frequency tuning is carried out by changing the frequency of the heterodyne signal, in case of direct heterodyning, the response of the frequency-selective device to the ultrashort pulse action is used as the fixed frequency radio pulses, and after return heterodyning, the filtering of the reflected signal is performed by the same frequency-selective device. Direct and return heterodyning are performed by the same device.EFFECT: ensuring the optimal reception of reflected signals during carrier frequency tuning of the emitted radio pulses from pulse to pulse without requiring long-term stability of the frequency parameters of the incoming devices and with a simpler practical implementation.2 cl, 4 dwg

ethod for increasing range resolution of radar station // 2596229
FIELD: radars.SUBSTANCE: invention relates to radiolocation and is intended to improve range resolution of radar stations. Said result is achieved due to that, stack of N signal pulses is formed at different carrier frequencies and N reference signals in the form of orthogonal M-sequences, where N is an integer greater than or equal to two, each pulse is phase-modulated by the reference signal, successively coherently radiated and reflected stack of N signal pulses is received. Then convolution of each received pulse is performed with appropriate reference signal in the form of M-sequence, doppler filtration of stack of N signal pulses is performed, N range resolution elements are formed.EFFECT: technical result is higher signal/noise ratio of the received signal due to suppression of signals, received from multiple ranges from previous radiated pulses on adjacent carrier frequencies, as well as from the side lobes of the spectrum of the previous radiated pulses.1 cl, 5 dwg
 
2551017.
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