A parameter estimation algorithm for LFM/BPSK hybrid modulated signal intercepted by Nyquist folding receiver.
A parameter estimation algorithm for LFM/BPSK hybrid modulated signal intercepted by Nyquist folding receiver.
复制标题
奈奎斯特折叠接收机截获的LFM/BPSK混合调制信号参数估计算法
DOI：
10.1186/s13634-016-0387-2
复制
发表时间：
2016
影响因子：
1.9
通讯作者：
Tang B
中科院分区：
文献类型：
--
作者：
Qiu Z;Wang P;Zhu J;Tang B
奈奎斯特折叠接收机（NYFR）是一种新型的超宽带接收机结构，它可以用少量的设备实现宽带接收。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截获概率信号。NYFR是一种有效的LFM/BPSK信号截获结构，NYFR截获的LFM/BPSK信号将加入本振调制。提出了一种NYFR输出信号的参数估计算法。根据NYFR先验信息，提出了利用啁啾奇异值比谱估计啁啾速率的方法。然后，根据输出自特性，设计匹配分量函数估计奈奎斯特区（NZ）指数。最后，采用匹配码和子空间方法估计相位变化点和码长。与现有方法相比，该算法具有更好的性能。该算法不需要构造多信道结构，NZ指数估计的计算复杂度较小。仿真结果验证了该算法的有效性。
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.