NDLI: Dynamics Performance of Carrier and Code Tracking Loops in Ultra-Tight GPS/INS/PL Integration

Content Provider	IEEE Xplore Digital Library
Author	Babu, R. Jinling Wang
Copyright Year	2005
Description	Author affiliation: School of Surveying and Spatial Information Systems, University of New South Wales, Sydney, 2052, Australia, E-mail: s.ravi@unsw.edu.au (Babu, R.)
Abstract	Integrating the correlator measurements, I (in-phase) and Q (quadrature), with position, velocity and attitude from INS in a Kalman filter characterizes the ultra-tight GPS/INS integrated system. The Doppler feedback derived from the corrected INS is fed back to the carrier-tracking loop to remove the dynamics from the GPS/PL ranging signals, thereby reducing the carrier tracking bandwidth. This reduction in bandwidth results in better code and carrier measurements accuracy. Therefore accurate estimation of the Doppler frequency from the INS becomes paramount in leveraging the benefits of ultra-tightly coupled systems. Although the code loops are not directly aided by the INS derived Doppler in ultra-tightly coupled system, nevertheless, an accurate knowledge of Doppler information from INS results in better code thresholds. This improvement in threshold further increases the accuracy of raw measurements and also jamming immunity. In unaided mode, the carrier and code tracking loop bandwidths are about 15 Hz and 3 Hz respectively, whereas in ultra-tight integration mode the bandwidths can be reduced to 3 Hz and 1 Hz respectively. In this paper, the performance of the carrier and code tracking loops are analyzed. A Software GPS receiver is used to perform the analysis. A Costas Loop is used for carrier tracking with an arctan discriminator function, while a narrowband DLL with a E-L/E+L discriminator is used for the code tracking loops.
Starting Page	233
Ending Page	236
File Size	1229275
Page Count	4
File Format	PDF
ISBN	0780395034
DOI	10.1109/INDCON.2005.1590162
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-11
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tracking loops Q measurement Feedback loop Bandwidth Position measurement Frequency estimation Correlators Performance analysis Velocity measurement Global Positioning System
Content Type	Text
Resource Type	Article

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