国防科技大学学报2013，Vol.35Issue(1)：70-76,7.
GPS接收信号中线性扫频干扰的抑制
LFM interference mitigation in GPS received signal
摘要
Abstract
Linear Frequency Modulation (LFM) interference mitigation in received GPS signal by antenna array was studied. The pivotal problem of LFM interference suppression is the instantaneous frequency estimation, With this conception, the cross-term in the time-frequency distribution must be suppressed. Thus the received signal vector was whitened and the Spatial-Time-Frequency Distribution (STFD) matrix was formed by utilizing the whitened signal vector. A decision variable which is different from traditional one was deduced. By using the decision variable, the auto-term in the time-frequency distribution of the LFM signal can be selected clearly. Based on the time-frequency distribution of the auto-terms, the parameters and the instantaneous frequency of the LFM signals can be estimated. According to the instantaneous frequency, corresponding notch filters can be formed, which can mitigate the interferences. Through simulation, it can be viewed that the time-frequency distribution of the received signal which is interfered seriously by the cross-term can be mapped into a clear time-frequency distribution of auto-terms of the signal. Under the condition that the number of snap is enough, the LFM interferences can be suppressed clearly.关键词
LFM信号/空时频分布矩阵/白化矩阵/判决变量/陷波器Key words
LFM signal/ spatial-time-frequency distribution/ whitening matrix/ decision variable/ notch filter分类
信息技术与安全科学引用本文复制引用
周柱,卢树军,张尔扬,李耀明..GPS接收信号中线性扫频干扰的抑制[J].国防科技大学学报,2013,35(1):70-76,7.基金项目
国家部委资助项目(9140C0202011003) （9140C0202011003）
