Abstract
This research presents a comprehensive and advanced simulation testing platform designed to address the operational needs of navigation satellites utilizing the BeiDou-3 (BD3) system. The platform integrates both RNSS (Radio Navigation Satellite System) and GPS data simulation capabilities, supporting hybrid navigation constellations to ensure reliable and precise testing across diverse scenarios. The platform is engineered to meet several essential requirements, including satellite constellation, clock bias, and spatiotemporal system simulation; space environment parameter simulation; user trajectory simulation; wide-area differential correction and integrity information; navigation message generation; observation data generation; and RDSS data simulation. This innovative solution provides robust support for testing navigation systems under various conditions, improving the development and reliability of satellite-based navigation technologies.