Vol.70, No.3, 2022, pp.6159-6176, doi:10.32604/cmc.2022.020793
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ARTICLE
Data Wipe-Off Technique for Tracking Weak GPS Signals
  • Dah-Jing Jwo*, Sheng-Feng Chiu
Department of Communications, Navigation and Control Engineering, National Taiwan Ocean University, Keelung, 202301, Taiwan
* Corresponding Author: Dah-Jing Jwo. Email:
Received 08 June 2021; Accepted 23 August 2021; Issue published 11 October 2021
Abstract
In this paper, the data wipe-off (DWO) algorithm is incorporated into the vector tracking loop of the Global Positioning System (GPS) receiver for improving signal tracking performance. The navigation data, which contains information that is necessary to perform navigation computations, are binary phase-shift keying (BPSK) modulated onto the GPS carrier phase with the bit duration of 20 ms (i.e., 50 bits per second). To continuously track the satellite’s signal in weak signal environment, the DWO algorithm on the basis of pre-detection method is adopted to detect data bit sign reversal every 20 ms. Tracking accuracy of a weak GPS signal is decreased by possible data bit sign reversal every 20 ms to the predetection integration time (PIT) or integration interval. To achieve better tracking performance in weak signal environment, the coherent integration interval can be extended. However, increase of the integration interval lead to decrease of the tracking accuracy by possible data bit sign reversal every 20 ms to the integration interval. When the integration interval of the correlator is extended over 20 ms in low C/No levels, the navigation DWO algorithm can be employed to avoid energy loss due to bit transitions. The method presented in this paper has an advantage to continuously estimate the navigation data bit and achieve improved tracking performance. Evaluation of the tracking performance based on the various integration intervals for the vector tracking loop of a GPS receiver will be presented.
Keywords
Global positioning system (GPS); integration interval; data wipe-off; weak signal
Cite This Article
Jwo, D., Chiu, S. (2022). Data Wipe-Off Technique for Tracking Weak GPS Signals. CMC-Computers, Materials & Continua, 70(3), 6159–6176.
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