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

中文翻译：

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奈奎斯特折叠接收机截获的LFM / BPSK混合调制信号的参数估计算法。

奈奎斯特折叠式接收器（NYFR）是一种新颖的超宽带接收器体系结构，可以用少量设备实现宽带接收。线性调频/二进制相移键控（LFM / BPSK）混合调制信号是一种新型的宽带低概率截获信号。NYFR是一种有效的架构，可以截获LFM / BPSK信号，而NYFR截获的LFM / BPSK信号将增加本地振荡器调制。提出了一种用于NYFR输出信号的参数估计算法。根据NYFR先验信息，提出了线性调频奇异值比率谱来估计线性调频率。然后，基于输出的自身特征，设计匹配组件函数以估计奈奎斯特带（NZ）指数。最后，匹配码和子空间方法被用来估计相变点和码长。与现有方法相比，该算法具有更好的性能。它还不需要构造多通道结构，这意味着NZ索引估计的计算复杂度很小。仿真结果证明了该算法的有效性。