Autonomous orbit determination and time synchronization test method for satellites in a dynamic satellite network

Abstract

The invention provides an autonomous orbit determination and time synchronization test method for satellites in a dynamic satellite network. The method comprises the steps of 1 simulating to obtain orbit parameters of a tested satellite and target satellites at N time slot starting points through precision orbit data and error models of M target satellites in a constellation; 2 storing the orbit parameters of the measured satellite obtained in the step 1; 3 storing and inputting orbit parameters and link establishment topological relations of the tested satellite and the target satellites intoan inter-satellite link simulator according to an agreed format; 4 after time synchronization of the inter-satellite link simulator and the satellite is completed, outputting an analog signal to an inter-satellite link load; 5 enabling the inter-satellite link load to run an autonomous orbit determination and time synchronization algorithm, and outputting a result after the algorithm is converged; and 6 comparing the output result in the step 5 with the theoretical reference value in the step 2. The inter-satellite link loads of a plurality of target satellites in the satellite network are simulated in a time-sharing manner by using a set of inter-satellite link simulator.

Description

technical field [0001] The invention relates to the technical field of autonomous orbit determination and time synchronization, in particular to a test method for satellite autonomous orbit determination and time synchronization in 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 satellites in the n...

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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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