An Improved Adaptive Multi-Frequency GPS Carrier Tracking Algorithm for Navigation in Challenging Environments

Rong Yang, Dongyang Xu, Yu Morton

Abstract:	This paper presents an improved adaptive multi-frequency (AMF) carrier tracking algorithm applicable to receivers operating in challenging environments. This algorithm is achieved by adaptively switching between the singlefrequency tracking (ST) mode and the joint-frequency tracking (JT) mode according to the signal carrier to noise ratio (C/N0) estimates. The ST mode only considers measurements from a single carrier. In the JT mode, states for multiple carriers are modeled and estimated based on measurements obtained utilizing the inter-frequency Doppler relationships among the carriers. The real multifrequency GPS data collected on Hawaii Island with strong tropospheric and ocean surface multipath scintillations were firstly characterized and analyzed and then used to verify the performance of the proposed algorithm. Tracking results demonstrate that the improved AMF algorithm can improve tracking accuracy over conventional tracking methods in the presence of nonconcurrent frequency selective fading during strong scintillations.
Published in:	2018 IEEE/ION Position, Location and Navigation Symposium (PLANS) April 23 - 26, 2018 Hyatt Regency Hotel Monterey, CA
Pages:	899 - 907
Cite this article:	Yang, Rong, Xu, Dongyang, Morton, Yu, "An Improved Adaptive Multi-Frequency GPS Carrier Tracking Algorithm for Navigation in Challenging Environments," 2018 IEEE/ION Position, Location and Navigation Symposium (PLANS), Monterey, CA, April 2018, pp. 899-907.
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