A pulse-Doppler processing scheme for quadrature compressive sampling radar

Quadrature compressive sampling (QuadCS) is a sub-Nyquist sampling system for acquiring inphase and quadrature (I/Q) components of radio-frequency signals. This paper discusses the application of the QuadCS system to pulse-Doppler radars and develops a compressive sampling pulse-Doppler (CoSaPD) processing scheme from the sub-Nyquist samples. The Doppler estimation is realized through spectrum analyzer as in classic processing. The detection is done on the Doppler bin data. The range estimation is performed through sparse recovery algorithms on the detected targets. Due to inherent detection property of the recovery algorithms, the detection threshold can be set at a low value and then the introduced false targets are removed in the range estimation stage. Simulation results show that the CoSaPD scheme with the data at one eighth the Nyquist rate and for SNR above -25dB can achieve performance of the classic processing with Nyquist samples.