Unambiguous Delay-Doppler Recovery From Random Phase Coded Pulses

Pulse Doppler radars suffer from range-Doppler ambiguity that translates into a trade-off between maximal unambiguous range and velocity. Several techniques, like the multiple PRFs (MPRF) method, have been proposed to mitigate this problem. The drawback of MPRF method is received samples are not processed jointly, decreasing signal noise ratio (SNR). To overcome drawbacks MPRF, we employ random pulse phase coding approach increase region while preserving region. Our encodes each with phase, varying pulse, then processes jointly resolve ambiguity. This technique increases SNR through joint processing without parameter matching procedures required in method. recovery algorithm designed based on orthogonal pursuit so it can be directly applied either Nyquist or sub-Nyquist samples. delay-Doppler condition derived compressed sensing theory noiseless settings. In particular, an upper bound number targets given, respect repetition interval transmit pulses. Simulations show both regimes our outperforms popular terms hit rate.