Title :
Reduction of multipath-induced bias of GPS time-of-arrival
Author :
Fante, R.L. ; Vaccaro, J.J.
Author_Institution :
MITRE Corp., Bedford, MA, USA
Abstract :
We investigate a blind method for cancelling the multipath effects, in order to improve the time-of-arrival estimate. Our approach uses early-late gate processing on an objective function derived from an adaptive FIR filter that attempts to match the crosscorrelation of the received signal with a multipath-free replica of the desired crosscorrelation. This method performs reasonably well, and decreases the bias by approximately a factor of 2, even in very stressing multipath environments.
Keywords :
FIR filters; Global Positioning System; adaptive filters; correlation methods; multipath channels; parameter estimation; radiowave propagation; GPS time-of-arrival; adaptive FIR filter; blind multipath cancellation method; early-late gate processing; multipath-free crosscorrelation replica; multipath-induced bias reduction; objective function; received signal crosscorrelation matching; very stressing multipath environments; Bandwidth; Delay effects; Delay estimation; Finite impulse response filter; Global Positioning System; Position measurement; Satellites; Signal processing; Time measurement; Voltage;
Conference_Titel :
Position Location and Navigation Symposium, 2002 IEEE
Print_ISBN :
0-7803-7251-4
DOI :
10.1109/PLANS.2002.998891
