Study on Satellite Navigation Service Availability Concept and Simulation Analysis
Service availability for accuracy is a basic element in the performance frame of the GNSS services. In the system designing phase, service availability is a key link to the satellite constellation and maintenance strategy, the distribution of internal rel
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Abstract Service availability for accuracy is a basic element in the performance frame of the GNSS services. In the system designing phase, service availability is a key link to the satellite constellation and maintenance strategy, the distribution of internal reliability performance, and the decision of service accuracy. In the system operation monitoring phase, service availability is one of the emphases of system service performance assessment and evaluation. In this paper, the understanding for the concept of service availability in the field of satellite navigation is introduced first. Then, some key problems in the design of satellite navigation service availability are studied, a calculation formula of service availability is proposed based on multiple constraints such as single satellite availability, ranging error and user operating conditions, and the accuracy threshold for the service availability is established which is different from the GPS SPS. Finally, according to two configuration alternatives of the BeiDou global constellation, simulation analysis of the service availability of the Asia-Pacific region is made, pointing out the difference between the two alternatives, providing a reference for the future BeiDou global system optimization. Keywords Satellite navigation evaluation
Service availability Reliability design Test
1 Introduction Service performance of global navigation satellite system includes accuracy, availability, integrity, continuity, each element of the four indicators depth cross-linking, where availability is a reliable guarantee for the remaining three indicators, is perceived by the user of satellite navigation services reliability, robustness direct factor. The satellite navigation service accuracy, integrity, contiT. Zhang (&) H. Wang L. Chen Beijing Satellite Navigation Center, Beijing 100094, China e-mail: [email protected] © Springer Science+Business Media Singapore 2016 J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2016 Proceedings: Volume I, Lecture Notes in Electrical Engineering 388, DOI 10.1007/978-981-10-0934-1_37
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nuity, these we usually refer to is all based on certain availability guarantee. Throughout the promises made by GPS, GLONASS, Galileo promises to ICAO, IMO [1], the availability indicators of satellite navigation service are generally better than the 99 %, in order to meet wide variety of user needs. Since the range accuracy performance of signal in space, broadcasting from the four major global navigation satellite systems, is relatively close, so the service availability depends mainly on the availability of navigation satellite constellations. Concerned to the global navigation satellite constellation, NAVSTAR GPS, as the same as GLONASS, uses a constellation of 21 + 3 configuration in the early design. With the global satellite navigation applications continuously increasing, the United States completed the adjustment of the original GPS constellation from January 2010 to June 2011, replacing to 24
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