Credibility verification method of high-fidelity simulation model of satellite navigation system

Abstract

The invention discloses a credibility verification method for a satellite navigation system high-fidelity simulation model. The method comprises the steps of 1, building a systematic and layering model effectiveness verification method based on model credibility assessment, and forming a model verification standard tool magazine covering a satellite navigation system unit level, a module level, a subsystem level and a system-level model; 2, building a model verification method based on an international space-time reference frame, and ensuring the consistency of the satellite navigation simulation system space-time reference and an actual system space-time reference frame; 3, building bottom-up layer-by-layer weighing testing comprehensive model verification method, and completing credibility verification of the satellite navigation simulation system basic model; 4, building a two-step method model verification method on the basis of the combination of measured data error separation and inverse calculation, and performing credibility verification on the satellite navigation observation data simulation model. The method has the advantages of being easy and convenient to operate, easy to implement, high in credibility and the like.

Description

technical field [0001] The invention mainly relates to the field of satellite navigation systems, in particular to a credibility verification method suitable for high-fidelity simulation models of satellite navigation systems. Background technique [0002] The satellite navigation high-fidelity simulation system is a simulation platform that can truly reflect the working principle and operation mechanism of the satellite navigation system by using system modeling and simulation technology, and provides technical solutions for the actual system demonstration, technical index verification, development methods and application effects. Test verification and test evaluation support are basic tools for scientific researchers in the navigation field, satellite navigation system builders, and satellite navigation users. The analysis results of the satellite navigation high-fidelity simulation system directly affect the decision-making or application of the actual work. Therefore, t...

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Problems solved by technology

[0009] 1. It is difficult to verify the unit-level model in the satellite navigation high-fidelity simulation system, and it is impossible to accurately locate the problems found in the verification;

[0010] 2. The basic simulation models of navigation constellation satellite orbits, spaceborne atomic clocks, space environment and navigation messages have a high degree of abstraction and complex calculation processes, and existing technologies cannot be effectively verified;

[0011] 3. Satellite navigation observation data includes multiple observation values ​​such as pseudorange, carrier phase, Doppler frequency shift, pseudorange variability, etc. The simulation models of each observation value are coupled with each other, which leads to complicated verification process of observation data simulation

The influence of many factors on the simulation of satellite navigation observation data and the complexity of the observation data itself make it a difficult problem to verify the validity of the simulation value of satellite navigation observation data.

[0012] 4. It is difficult to verify the satellite navigation space-time reference conversion model

However, satellite orbit, clock error, ionosphere, and multipath are affected by various uncertain factors. It is quite difficult to obtain a high-fidelity model. How to verify the validity of the simulation model has become a core problem.

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