基于改进小波脊线的PSK信号载频提取技术仿真  

Simulation of PSK Carrier-Frequency Extraction Based on Improved Wavelet-ridge Method

作　　者：池庆玺[1,2] 袁健全[2] 陈旭情[2] 佟富欣 

机构地区：[1]哈尔滨工程大学,信息与通信工程学院,黑龙江哈尔滨150001 [2]中国航天科工飞航技术研究院,北京机电工程研究所,北京100074 [3]中国航天二院科研部,北京100854

出　　处：《系统仿真学报》2008年第23期6338-6342,共5页Journal of System Simulation

摘　　要：针对低截获概率(LPI)雷达中相位编码(PSK)信号的二相编码(BPSK)、四相编码(QPSK)信号载频估计,提出了小波脊线迭代法下PSK信号载频提取技术及其抗噪性能,分析了其在载频提取中迭代初始参数选取、迭代结果精度以及发散点迭代等不足,给出了用于PSK载频提取的改进小波脊线。改进方法在发挥运算量小、抗噪性能的同时,提高了PSK信号载频估计精度。MATLA仿真验证了改进算法的有效性,表明其较传统相位差分法信噪比门限降低了5dB。Aiming at estimating the carrier-frequency of the BPSK and QPSK signal in the LPI radar, the iterative wavelet-ridge method for PSK carrier-frequency and its anti-noise performance was produced. The wavelet-ridge problems were discussed during the extraction process, including the choice of initial parameter, the precision of iterative result and the iteration of divergence point. As a result, the improved wavelet-ridge method was proposed. The improved method not only maintains the slight computational complexity and anti-noise performance, but also increases the estimation precision of carrier-frequency. The MATLAB simulation verifies the improved method＇s prior performance, and demonstrates that its SNR threshold is lower 5dB than the conventional phase difference.

关 键 词：低截获概率雷达 相位编码 载频提取 小波脊线 相位差分法 

分 类 号：TN911.72[电子电信—通信与信息系统]