Timing performance evaluation of BDS IGSO-6 and GEO-7 satellite network GNSS timing performance evaluation method and characterization

BeiDou Navigation Satellite System (short for BDS) officially provided service to most parts of Asia since December 27th. 2012^[1]. After a year of testing and evaluation work China Satellite Navigation Office published “BeiDou Navigation Satellite System Open Service Performance Standard (Version 1.0)” (hereinafter short for “BDS-OS-PS-1.0”) in December 2013^[2], which presented each performance index of BDS service. Among 2016 China launched two satellites of IGSO-6 (NO.22, March 30th) and GEO-7 (NO.23, June 12th), and before the formal operation services both of them still needed further testing and evaluation work of satellites network, which obtained the actual testing results of every performance index to provide the basis for network operation and service performance commitment. Therefor taking “BDS-OS-PS-1.0” as the basis we undertook the timing evaluation work of each satellite network, which analyzed the satellites timing performance in B1, B3, B1/B2, B1/B3 frequency bands as well as the contribution to the current system. The results showed the timing performance of IGSO-6 and GEO-7 could meet the requirement of timing precision better than 50ns, and either of them adding to BDS would improve the precision and reliability of system service.