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Proceedings Paper

Performance analysis of subspace projection techniques for FM interference rejection in GPS receivers
Author(s): Liang Zhao; Moeness G. Amin; Alan R. Lindsey
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Paper Abstract

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 GPA C/A spreading codes. The instantaneous frequency (IF) estimate, provided by the time-frequency distribution, 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.

Paper Details

Date Published: 28 August 2001
PDF: 10 pages
Proc. SPIE 4395, Digital Wireless Communication III, (28 August 2001); doi: 10.1117/12.438281
Show Author Affiliations
Liang Zhao, Villanova Univ. (United States)
Moeness G. Amin, Villanova Univ. (United States)
Alan R. Lindsey, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 4395:
Digital Wireless Communication III
Raghuveer M. Rao; Soheil A. Dianat; Michael D. Zoltowski, Editor(s)

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