Design and Practice of Digital Test and Verification of BeiDou Navigation Satellite System

The BeiDou Navigation Satellite System (BDS) is a national strategic major space infrastructure built and operated independently in China [1]. It has created a new system of global satellite navigation, such as heterogeneous mixed constellation, multi service integration and high-precision satellite to ground inter satellite measurement. It has the outstanding characteristics of large span of technological innovation, high complexity of satellite to ground integration and fast iterative evolution speed. In order to speed up the iterative evolution of technical state, reduce the development risk and improve the efficiency cost ratio of the project, the digital twin concept is introduced into the construction process of BDS, and the digital practice of experimental verification is carried out in different stages. Combined with the technical system characteristics of BDS-1, BDS -2 and BDS -3, this paper comprehensively combs the development and evolution of digital system test verification, compares the tasks, resources and means of test verification in different stages, and summarizes the achievements of BDS in the establishment of digital test verification system, the construction of modeling and simulation mode, the construction of fusion test platform and the exploration of space test route The innovation of BDS has brought great benefits to solidify the technical status of BDS, guarantee the implementation of engineering construction, and support the upgrading and development of the system. Finally, according to the development requirements of the subsequent national integrated PNT system, the development assumption of the next generation BDS test and verification system is further planned.