Title :
GPS C/A code tracking with adaptive beamforming and jammer nulling
Author :
Seung-Jun Kim ; Iltis, Ronald A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
A space-time adaptive processing (STAP) algorithm for delay tracking and acquisition of the GPS signature sequence with interference rejection capability is developed. The interference can consist of both broadband and narrowband jammers. The narrowband jammers are modeled as vector autoregressive (VAR) processes and rejected by temporal whitening. The spatial nulling is implicitly achieved by estimating a sample covariance matrix and feeding its inverse into the extended Kalman filter (EKF). Computer simulations demonstrate robust performance of the algorithm in severe jamming, and also show that the algorithm outperforms the conventional delay-locked loop (DLL).
Keywords :
Global Positioning System; Kalman filters; array signal processing; autoregressive processes; covariance matrices; delays; fading channels; interference suppression; jamming; parameter estimation; signal detection; space-time adaptive processing; tracking filters; EKF-based tracking; GPS signature sequence; STAP algorithm; adaptive antenna array techniques; adaptive beamforming; broadband jammers; code tracking; covariance matrix; delay tracking; delay-locked loop; extended Kalman filter; flat fading channel; interference rejection; jammer nulling; narrowband jammers; space-time adaptive processing; temporal whitening; vector autoregressive processes; Array signal processing; Computer simulation; Covariance matrix; Delay; Global Positioning System; Interference; Jamming; Narrowband; Reactive power; Robustness;
Conference_Titel :
Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7576-9
DOI :
10.1109/ACSSC.2002.1196929