Research On The Design Of Precise Time And Frequency Standard For Navigation Satellite

Precise navigation depends on precise time. Actually, in the global navigation satellite system (GNSS) the precise position measurement is the precise time measurement, while precise time comes from precise time and frequency standard signal. High-precision satellite time and frequency standard signal is the base of navigation position, time transfer and velocity measurement in GNSS. Research on the technology of high-precision navigation time and frequency standard source production is the key orientation of national foundational research and contributes signally to national construction and development.In the first part, this article introduces the development status of navigation satellite time and frequency standard devices research both in domestic and abroad. The realization methods and technical indicators are also provided. Based on former research, it sorts out the development trend of next generation of time and frequency standard devices in high-performance GNSS.Part Two analyzes the key technical indicators such as accuracy of time and frequency signal, frequency stability, and shows the transformation relationship of relative indicators. As the theoretical basis of prototype design, the paper studies the navigation high-precision time and frequency standard source generation technology based on the mixture of digital phase-locked loop(DPLL) and direct digital frequency synthesis(DDS). Moreover, it simulates the generation of high-precision, high-stability, low phase noise and low spur standard signal and analyzes its performance.According to system function and indicator requirement, Part Three puts forward a practical solution of high-precision time and frequency standard resource prototype realization, which transforms 10MHz reference signal outputted by Rubidium atomic clock into high-reliability, high-precision, stable and continuous 10.23MHz navigation satellite time and frequency standard signal, and realizes it by hardware and software. Finally, aimed at the key technical indicators of prototype design, tests and verifies are made and the specific testing results are provided.