A Test Method for Satellite Autonomous Orbit Determination and Time Synchronization in Dynamic Satellite Networks

Abstract

The test method for satellite autonomous orbit determination and time synchronization in the dynamic satellite network of the present invention comprises the following steps: 1), through the precise orbit data and error model of M target satellites in the constellation, the simulation obtains the measured satellite and the target satellite in N The orbital parameters of the time slot start point; 2), the orbital parameters of the measured satellite obtained in the preservation step 1; 3), the orbital parameters and the link-building topology relationship of the measured satellite and the target satellite are saved according to the agreed format and input into the inter-satellite link Simulator; 4), after the inter-satellite link simulator and the satellite complete the time synchronization, and output the analog signal to the inter-satellite link load; 5), the inter-satellite link load runs the autonomous orbit determination and time synchronization algorithm, after the algorithm converges Output result; 6), compare the output result in step 5 with the theoretical reference value in step 2. A set of satellite inter-satellite link simulators is used to simulate the inter-satellite link load of multiple target satellites in the satellite network in time-sharing.

Description

technical field [0001] The invention relates to the field of autonomous orbit determination and time synchronization of a dynamic satellite network, in particular to a system test method for autonomous orbit determination and time synchronization of a dynamic satellite network. Background technique [0002] The dynamic satellite network based on the inter-satellite link usually has the functions of autonomous orbit determination and time synchronization. Use inter-satellite observation pseudo-range and message exchange to realize autonomous orbit determination and time synchronization, in order to cope with the autonomous operation of satellite constellations in wartime without ground support scenarios, and provide reliable, high-precision positioning and timing services to ground user receivers. [0003] The link-building topology relationship between each node satellite in the dynamic satellite network can realize fast switching with a us-level delay. The total number of s...

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Problems solved by technology

[0003] The link-building topology relationship between each node satellite in the dynamic satellite network can realize fast switching with a us-level delay. The total number of satellites in the network is up to 30, and each node satellite can complete rotation with up to 12 target satellites in a short period of time. Inquiry handshake, the process is more complicated

Usually, to complete the test of the real scene on the ground, 8 to 12 inter-satellite link loads are required, and a corresponding number of channel simulators are required, and with the high-speed switching matrix switch, the inter-satellite link loads are realized. Dynamic handshaking, ground testing consumes more resources and lower operability

[0004] The ground testing and evaluation of the autonomous orbit determination and time synchronization of the dynamic satellite network lacks effective means, and the satellite network is different from the ground network, and the real scene verification cannot be carried out on the ground, and the satellite network is irreparable and more dependent on the ground Simulation and testing of

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