Abstract
As a sensor for standalone position and velocity determination, the BeiDou Navigation Satellite System (BDS) receiver is becoming an important part of the intelligent logistics systems under rapid development in China. The applications in the mass market urgently require the BDS receivers to improve the performance of such functions, that is, shorter Time to First Fix (TTFF) and faster navigation signal acquisition speed with Ephemeris Extension (EE) in standalone mode. As a practical way to improve such functions of the Assisted BDS (A-BDS) receivers without the need for specialized hardware support, a Self-Assisted First-Fix (SAFF) method with medium- and long-term EE is proposed in this paper. In this SAFF method, the dynamic Medium- and Long-Term Orbit Prediction (MLTOP) method, which uses the historical broadcast ephemeris data with the optimal configuration of the dynamic models and orbit fitting time interval, is utilized to generate the extended ephemeris. To demonstrate the performance of the MLTOP method used in the SAFF method, a suit of tests, which were based on the real data of broadcast ephemeris and precise ephemeris, were carried out. In terms of the positioning accuracy, the overall performance of the SAFF method is illustrated. Based on the characteristics of the medium- and long-term EE, the simulation tests for the SAFF method were conducted. Results show that, for the SAFF method with medium- and long-term EE of the BeiDou MEO/IGSO satellites, the horizontal positioning accuracy is about 12 meters, and the overall positioning accuracy is about 25 meters. The results also indicate that, for the BeiDou satellites with different orbit types, the optimal configurations of the MLTOP method are different.
Highlights
At present, the BeiDou Navigation Satellite System (BDS), as one of the four major Global Navigation Satellite Systems (GNSSs)[1], has been providing reliable Positioning, Navigation, and Timing (PNT) services in Asia and Pacific areas [2, 3]
We aim to provide more data records about the Self-Assisted First Fix (SAFF) method with medium- and long-term EE of the BeiDou satellites, which can provide some guidelines for the design of advanced Assisted BDS (A-BDS) receivers
Based on real broadcast ephemeris data and precise ephemeris products, tests were carried out to evaluate the performance of the SAFF method and the dynamic Medium- and Long-Term Orbit Prediction (MLTOP) method used in it
Summary
The BeiDou Navigation Satellite System (BDS), as one of the four major Global Navigation Satellite Systems (GNSSs)[1], has been providing reliable Positioning, Navigation, and Timing (PNT) services in Asia and Pacific areas [2, 3]. For the MLTOP method, [12] studied the use of ground observation data for predicting the high-precision long-term ephemeris of the GPS satellites. This method is based on the satellite dynamic model.
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