基于信道化谱增强的混合DS/FH扩频信号跳速估计
doi: 10.3724/SP.J.1146.2009.00094
Hop Rate Estimation of Hybrid DS/FH Spread Spectrum Signals Based on a Channelized Spectral Enhancement Strategy
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摘要: 该方法首先利用非线性变换获得携带跳速信息的参考信号，并利用循环谱预估计该信号的频率集；在此基础上，提出一种新的信道化谱增强系统。该系统所具有的外在线性内在非线性(ELIN)特性能够在防止信号失真的前提下有效克服噪声及干扰对后续时频分析的影响；最后，通过SPWVD(平滑伪Wigner-Ville分布)实现精确的跳速估计。该算法无需信号的先验知识，并易于通信侦测接收机实现。仿真实验证明了该算法在低信噪比下对跳速估计的有效性。
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关键词:
- 通信对抗; 混合扩频; 参数估计; 跳速
Abstract: This paper addresses new hop rate estimation schemes for hybrid DS/FH_BPSK signals which employ a novel channelized spectral enhancement preprocessor and time-frequency analysis. Good performance is achieved by following three stages. Firstly, a nonlinear process is used to produce the reference signal which has the same hop rate as the original signal and its frequencies could be estimated by the cyclic spectrum. Then a novel Externally-Linear-Internally-Nonlinear(ELIN) channelized spectral enhancement system is employed to realize interference-suppression and enhance noisy signal without losing detail information. Finally, based on the reliable signal enhancement results, SPWVD(Smooth-Pseudo-Wigner-Ville Distribution) is used to estimate the hop rate of the hybrid DS/FH spread spectrum signal. Since no prior information of signals are needed, the proposed method is easy to implement for the reconnaissance receiver. The simulation results show that the proposed method can operate effectively even under low SNR conditions. -
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