Method for detecting and identifying satellite navigation RAIM (Receiver Autonomous Integrity Monitoring) multi-satellite faults

Abstract

The invention discloses a method for detecting and identifying satellite navigation RAIM (Receiver Autonomous Integrity Monitoring) multi-satellite faults, and relates to a method for detecting and identifying the RAIM starry faults on the basis of the least squares residual error method and the maximum likelihood estimation method, wherein the method has the advantages that the false alarm probability is low, the detection probability is high, and the computational load is relatively low. The method provided by the invention mainly comprises the following three aspects: firstly, using the least squares residual error method and the maximum likelihood estimation method to detect and identify multiple fault satellites in single step and by stages, removing one by one, and acquiring the fault-free satellite constellation; secondly, adopting the fault-free satellite constellation to conduct preliminary screening on the fault satellites and conduct identification one by one, and removing all of the false fault satellites; thirdly, adopting the multi-epoch fault detection result smoothing method to further improve the fault detection probability and reduce the false alarm probability. The method provided by the invention has the advantages that the detection probability is high, the false alarm probability is relatively low, and the computational load is less, therefore, the method applies to the application of user computers and ground station equipment.

Description

technical field [0001] The invention relates to satellite navigation RAIM multi-satellite fault detection and identification method, in particular to a method based on the least squares residual method and the maximum likelihood estimation method with low false alarm probability, high detection probability, and low calculation Quantitative RAIM multi-satellite fault detection and identification method. Background technique [0002] The satellite navigation system is that the user receives the navigation signal sent by the navigation satellite, and uses the navigation satellite as a dynamic known point, and uses the pseudo-range and other observation information to measure the on-flight position and speed of the moving carrier in real time, and then complete the navigation. Satellite navigation overcomes the shortcomings of traditional radio navigation systems and realizes all-weather, global high-precision continuous navigation functions, which can meet the needs of most nav...

AI Technical Summary

Problems solved by technology

[0009] According to the above-mentioned background technology, in order to solve the problem that the identification probability of the traditional RAIM algorithm is too low in the case of multiple faulty satellites, and the newly proposed method with a high detection probability has an excessive amount of calculation, the present invention provides a method with a higher detection probability, RAIM multi-satellite fault detection and identification method with low probability of false alarm, low computational load, and engineering implementation

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