Performance analysis of subspace projection techniques for FM interference rejection in GPS receivers

被引：2
|
作者：
Zhao, L [1 ]
Amin, MG [1 ]
Lindsey, AR [1 ]
机构：
[1] Villanova Univ, Dept Elect & Comp Engn, Villanova, PA 19085 USA
来源：
DIGITAL WIRELESS COMMUNICATION III | 2001年 / 4395卷
关键词：
GPS; spread spectrum; interference rejection; subspace projection; time-frequency;
D O I：
10.1117/12.438281
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Subspace projection techniques are effective in excising FM interferers in GPS receivers. The FM jammers are instantaneously narrowband and have clear time-frequency (t-f) signatures that are distinct from the GPS C/A spreading codes. The instantaneous frequency (IF) estimate, provided by the time-frequency distribution (TFD), or any other estimator, is used to form the jammer subspace. The interference rejection is implemented by projecting the received data onto the orthogonal subspace of the jammer subspace. Errors in IF estimations, however, perturb the projection matrix and allow some of the jammer power to escape the projection operation. This in turn leads to degraded receiver performance and lower SINR. This paper derives the signal-to-interference-and-noise ratio (SINR) of the GPS receivers in the presence of Gaussian IF estimation errors. It is shown that IF estimation errors can substantially impede interference rejection in GPS using subspace projection techniques.
引用
收藏
页码：145 / 154
页数：10
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