The Test on CAPS Experimental System Time Transfer

Abstract

China Area Positioning System (CAPS) is a novel navigation system, in which the satellite transponder without atomic clock onboard is used as navigation satellite. In 2002, a group of Chinese astronomers at the Chinese Academy of Sciences (CAS) presented this new concept. The function of CAPS demonstration system was checked and measured in June 2005. The time accuracy of CA-code is 160 ns. The time accuracy of P-code is 13 ns. From 2010 to 2017, CAPS developed from the verification system to the experimental system. CAPS experimental system is used for satellite navigation and technical experiment. It provides a real and space-ground integrated experimental environment, and fully supports the development of BeiDou Navigation Satellite System (BDS). In August 2017, the function of CAPS experimental system was checked and measured. The results are as follow: The uncertainty of time transfer is 2.87ns (95%) in Beijing, and the uncertainty of time transfer is 3.96ns (95%) in Xi'an. This paper describes the structure and working princip[le of CAPS experimental system, and analyzes the technical characteristics. We analyzed the difference between the CAPS verification system and the experimental system. We foclused on the th method of CAPS system timing test. At last, we give the system test results and make a particular analysis.