Digitized Design of Pseudo-Random Code CW Radar Receiver

摘要

In the traditional pseudo-random phase-coded continuous wave (PRC-CW) radar, several correlators are used repetitively to detect targets in different range cells, and sinusoidal frequency modulation is used for sensitivity-time control (STC). To reduce the scanning period and improve the measure accuracy, a digitized receiver scheme is proposed. By using high speed fixed-point DSP, convolution algorithm is implemented to replace the analogue multi-channel correlators. The sinusoid-modulated signal is recovered by measuring its phase. After convolution, STFT (Short Time Fourier Transform) is performed for each cell, and target detecting algorithm based on time-frequency CFAR is used. The feasibility of the scheme is simulated and the effectiveness is validated via experiments finally.