Method for detecting fault satellite of satellite navigation system

Abstract

The invention discloses a method for detecting fault satellites of a satellite navigation system, which comprises the steps: all visible satellites are divided into a first satellite subgroup and a second satellite subgroup according to a satellite top view direction angle in a navigating constellation, and fault detection is carried out on the first satellite subgroup and the second satellite subgroup respectively to obtain the fault satellites. The method adopts the technical scheme that all the visible satellites are grouped according to the satellite top view direction angle in the navigating constellation; the satellites with close or approximately reverse satellite top view direction angles are divided into a group according to the geometric distribution characteristic of the satellites; and LSR detection and MLE recognition are carried out on the grouped satellite subgroups respectively . The invention effectively increases the detection speed and the recognition rate of the fault satellites, is suitable for double-star detection and single-star detection and can be applied to a multiple-constellation satellite navigation system.

Description

Technical field [0001] The invention relates to a satellite integrity monitoring technology applied to the field of satellite navigation, in particular to a faulty satellite detection method of a satellite navigation system for quickly and effectively detecting and identifying faulty satellites according to the geometric distribution characteristics of the satellites. Background technique [0002] Global Navigation Satellite System (GNSS) is widely used in military, transportation, communications and other fields. Among them, the accuracy, integrity, continuity and availability of satellite navigation systems are the basis for ensuring the reliable operation of navigation users. For navigation users navigating in areas without landmarks (such as the sky, deserts, and oceans), the integrity of the satellite navigation system is a necessary condition to ensure the reliable operation of navigation users. [0003] For civil aviation users, in the navigation and positioning process, w...

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Problems solved by technology

[0006] At present, the detection of multi-satellite faults usually adopts the idea of ​​traversal, that is, to detect and identify faulty satellites by judging the subset of multiple satellites removed. Obtaining faulty satellites has a high recognition rate, but the detection time of faulty satellites is relatively long, which cannot meet users who have high requirements for the integrity of satellite faults, especially for civil aviation aircraft users, the detection time of faulty satellites is fast sex is very important

[0007] With the wide application of navigation and positioning technology in the field of civil aviation, for civil aviation users, especially civil aviation aircraft users, because civil aviation aircraft users have high requirements for the integrity of satellites, the detection time of faulty satellites when detecting faulty satellites It should be short, and the identification rate of faulty satellites should be high. At the same time, since civil aviation users use multi-constellation satellite navigation systems for navigation, the probability of faulty satellites in multi-constellation satellite navigation systems increases. Therefore, the current single-star fault detection cannot satisfy civil aviation users. Requirements for the recognition rate of faulty satellites. At the same time, in the existing technology for detecting multi-satellite faults, the detection time of faulty satellites is too long, which cannot meet the requirements of civil aviation users for the detection time of faulty satellites

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