Nyquist folding receiver (NYFR) is a novel ultra-wideband receiver architecture which can realize wideband receiving\nwith a small amount of equipment. Linear frequency modulated/binary phase shift keying (LFM/BPSK) hybrid\nmodulated signal is a novel kind of low probability interception signal with wide bandwidth. The NYFR is an\neffective architecture to intercept the LFM/BPSK signal and the LFM/BPSK signal intercepted by the NYFR will\nadd the local oscillator modulation. A parameter estimation algorithm for the NYFR output signal is proposed.\nAccording to the NYFR prior information, the chirp singular value ratio spectrum is proposed to estimate the\nchirp rate. Then, based on the output self-characteristic, matching component function is designed to estimate Nyquist\nzone (NZ) index. Finally, matching code and subspace method are employed to estimate the phase change points and\ncode length. Compared with the existing methods, the proposed algorithm has a better performance. It also\nhas no need to construct a multi-channel structure, which means the computational complexity for the NZ\nindex estimation is small. The simulation results demonstrate the efficacy of the proposed algorithm.
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