基于地面站的星间链路全网测试技术

Inter-satellite Link Network Test Technology based on Ground Station

摘要:

星间链路是我国自主导航系统的重要技术支撑,基于相控阵天线的并发空分时分双工(CSTDD,Concurrent Spatial Time Division Duplexing)组网体制为星间链路的实现提供了一种可行途径,该体制通过指向性天线形成窄波束切换指向来实现对整个空域的复用,通过单条链路半双工方式工作实现卫星之间的双向通信,从而实现整个星间链路采用同一频点。在全星座组网未完成的情况下如何对星间网络的全网性能进行有效测试是一个技术难题。星间链路全网测试技术旨在利用星间链路CSTDD体制的特点,利用单台地面站设备,对星间链路CSTDD体制的全网性能进行测试。详细介绍了星间链路CSTDD体制的特点,提炼出了星间链路的测试需求；并根据CSTDD体制特点,依托单台地面站设备,组成星间链路测试设备；产生指定数量的虚拟卫星,和空中的被测试卫星组成星间链路网络,完成了星间链路物理链路、测量数据、通信数据的测试,为组建我国自主导航系统提供了技术支撑。

Abstract:

—Inter-satellite Link is an important technical support of self-development navigation system in China. CSTDD(Concurrent Spatial Time Division Duplexing) is a system based on phased-array Antenna, providing a feasible way for the implementation of Inter-satellite Link. This system implements the reuse of the entire space by using directional antenna for narrow beam switching, it also realizes two-way communication between satellites by single link half duplex. At the same time, the whole system uses the same frequency point. How to test the performance of the whole inter-satellite link network under the condition of unfinished networking is a technical problem. The purpose of Inter-satellite Link Network Test Technology is to make use of the characteristics of CSTDD, and test the performance of whole network by using a single ground station. The characteristics of CSTDD are described in detail, and the test requirements of inter-satellite link are refined. Furthermore, an inter-satellite test equipment is made up by using a single ground station according to the characteristics of CSTDD. It generates specified number of virtual satellites, forming a network with satellites in space. It realizes the physical link test, the measurement data test, and the communication data test of inter-satellite link, and provides technical support of self-development navigation system in China.