Self‐assisted first‐fix method for GPS receiver with autonomous short‐term ephemeris prediction. Issue 11 (1st November 2019)

• Record Type: Journal Article
• Authors: Yang, Ruihong; Song, Zhongguo; Xi, Xiaoli
• Is Part Of: IET radar, sonar & navigation. Volume 13:Issue 11(2019)
• Page Start: 1974
• Page End: 1980
• Publication Date: 2019-11-01
• Subjects: artificial satellites -- Global Positioning System -- radio receivers -- celestial mechanics; GPS receiver -- short‐term ephemeris prediction -- key parameters -- global position system receiver -- autonomous satellite orbit prediction algorithm -- usable ephemeris -- broadcast ephemeris -- experimental results -- ephemeris prediction algorithm -- cold start mode -- presented algorithm -- empirical SRP model -- simulation results -- GPS PRN 5 -- constant parameters -- 5 days -- position error -- simulated satellite signals -- positioning results -- size 10.0 m -- time 5.0 d; Signal processing -- Periodicals; Radar -- Periodicals; Sonar -- Periodicals; Electronics in navigation -- Periodicals; Navigation -- Periodicals; 621.3848
• DOI: 10.1049/iet-rsn.2019.0003
• Languages: English
• ISSNs: 1751-8784

Abstract

Abstract : The time needed to get the first position is one of the key parameters to assess the performance of a global position system (GPS) receiver. Here, the authors present an autonomous satellite orbit prediction algorithm to provide usable ephemeris before the broadcast ephemeris is completely collected. Experimental results show that, with the ephemeris prediction algorithm, the TTFF of the receiver saves ∼74% in cold start mode. Furthermore, the accuracy of the presented algorithm is improved by using an empirical SRP model with parameters depending on the angle between the Sun and the satellite's orbital plane. Simulation results show that, for GPS PRN 5, when the SRP model with constant parameters is used to extrapolate the orbit for 5 days, only 43% of the position error is within 10 m, but this percentage can reach to 87% using the SRP model presented here. In addition, some single point positioning experiments with simulated satellite signals and real satellite signals are conducted to analyse the positioning results of the receiver with ephemeris prediction. The experimental results verify the effectiveness of the proposed algorithm.