Abstract
Radio determination satellite service (RDSS) is one of the characteristic services of Beidou navigation satellite system (BDS), and also distinguishes with other GNSS systems. BDS-3 RDSS adopts new signals, which is compatible with BDS-2 RDSS signals in order to guarantee the services of old users. Moreover, the new signals also separate civil signals and military signals which are modulated on different carriers to improve their isolation and RDSS service performance. Timing is an important part of RDSS service, which has been widely used in the field of the power, transportation, marine and others. Therefore, the timing accuracy, availability and continuity is an important guarantee for RDSS service. This paper summarizes the principle of one-way and two-way timing, and provides the evaluation method of RDSS timing accuracy, availability and continuity. Based on BDS-3 RDSS signal measurements of system, the performance of one-way timing and two-way timing is analyzed and evaluated for the first time. The results show that: (1) the accuracy of one-way timing and two-way timing is better than 30 ns and 8 ns respectively, which are better than the official claimed accuracy; (2) the RMS of one-way timing accuracy is 5.45 ns, which is 20% smaller than BDS-2, and the availability and continuity are 100%; (3) the RMS of two-way timing accuracy is 3.59 ns, which is 34% smaller than one-way timing, and both of the availability and continuity are 100%; (4) the orbit maneuver of GEO satellite make the one-way timing has 7.68 h recovery, but has no affection on the two-way timing.
Highlights
Where τi is the discrete point of timing accuracy, n is the number of sample points, τ is the mean value which reflects the constant deviation of timing results, STD is the standard deviation, which reflects the stability and variation range of timing results, τRMS is root mean square (RMS), which is the comprehensive result of mean value and standard deviation, and reflects comprehensively the deviation and stochastic error of timing results
TheThe preliminary conclusions are obtained as follows: (1) Both one-way timing and two-way timing results are periodical, and the spectrum analysis shows that the period is 1.01 days
(2) The accuracy of one-way timing is better than 30 ns, and for two-way timing it is better than 8ns
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In order to improve the capacity of the system, BDS-3 RDSS adopts narrow beams, and each satellite has six narrow beams to provide inbound and outbound links. BDS-3 RDSS separates civil signals and military signals, which are modulated on different carriers to improve their isolation, and to realize the security and compatibility. As a inbound spatial information infrastructure, the availability continuity satellite and military signals, which are modulated on different carriers to improve their isolation, navigation system services are important. Based on BDS-3 measurements, this paper is ns for the one-way timing service, and ns for the two-way timing service analyzed and evaluated the performance of the one-way timing service and two-way timAs a for spatial information infrastructure, the availability andRDSS continuity satellite ing service the first time, which provides technical support for timingofapplicanavigation system services are important. Materialsand and Methodsthe performance of the one-way timing service and two-way timing service for the first time, which provides technical support for RDSS timing application
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