Receiving and processing method of coherent frequency control array radar in frequency-phase coordination mode

Abstract

This invention discloses a coherent frequency-controlled array radar receiving and processing method in a frequency-phase cooperative mode, belonging to the field of FDA radar receiving and processing technology. First, based on the target azimuth information provided by the phased array radar, the coherent frequency-controlled array radar performs transmit beamforming to transmit a frequency-controlled array signal with a small frequency offset. Then, the received frequency-controlled array signal with a small frequency offset is sampled and stored at high speed. The sampled sequence of the echo is split to multiple receiver channels, and carrier frequency demodulation and matched filtering processing suitable for coherent frequency-controlled arrays are used. Finally, the phase terms corresponding to the time delay difference between the transmit channels are compensated for the output results of each receiver channel of all receiving array elements, forming a multi-channel data sequence. Based on a unique matched filter setting, this invention effectively demodulates the spectral aliasing signal transmitted by the coherent frequency-controlled array, forming a sharp target response in the matched filter output of each receiver channel, exhibiting high array gain, and without any limitations on the radar transmit waveform.

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