The results show that ISLs offer crucial support for BDS to provide global high-precision services under regional monitoring network conditions.Ĭhina’s self-built global navigation satellite systems (GNSS), noted as BeiDou navigation satellite system (BDS, or BDS-3 for the newest version), has completed constellation deployment and announced officially global services on 31 July 2020. POD based on data fusion of ISLs and ground-based L-band monitoring stations was conducted, with root-mean-square of posterior residuals of about 5.0 cm, and MEO radial accuracy better than 1.0 cm.

The performance evaluation involving the above three aspects was carried out using 14 days of ISL data, with some typical indicators derived. After comparing some technical features and the current status of the Global Navigation Satellite Systems ISLs, the measurement principle of dual one-way ISLs for BDS and its data processing methods are presented. The primary features of ISLs that affect the precision of precise orbit determination (POD) and time synchronization include (i) the spatiotemporal coverage or continuity of observations (ii) the observational accuracy, such as observation noise and bias and (iii) the observational geometry represented by dilution of precision.

The continuous full operation of the constellation of BeiDou navigation satellite system (BDS) provides favorable conditions for the performance evaluation of the BDS inter-satellite links (ISLs).

Astro driving navigator