Ground-based transmitters called pseudolites have been proposed to augment the basic Global Positioning System (GPS) in environments where satellite visibility is limited. One difficulty in their use is the so-called near-far problem, where in close proximity to the ground transmitter, the pseudolite signal can be orders of magnitude stronger than the satellite signals. This large range of signal levels prevents a conventional receiver from simultaneously detecting both types of signals. This paper describes the application of a signal processing technique, known as successive interference cancellation (SIC), to the acquisition and tracking of weak satellite signals in the presence of a nearby pseudolite and possible multipath reflections of this pseudolite signal. The SIC architecture is implemented on simulated and experimental near-far data sets. The results are compared with a conventional detector and improvements in acquisition and tracking performance are illustrated.
Application of successive interference cancellation to the GPS pseudolite near-far problem
IEEE Transactions on Aerospace and Electronic Systems ; 39 , 2 ; 481-488
2003-04-01
810245 byte
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Application of Successive Interference Cancellation to the GPS Pseudolite Near-Far Problem
Online Contents | 2003
|Modified GPS/Pseudolite Navigation Message
Online Contents | 2012
|