Beidou broadcast ephemeris maneuvering fault monitoring method considering parameter sensitivity

Abstract

The invention relates to a Beidou broadcast ephemeris maneuvering fault monitoring method considering parameter sensitivity, and belongs to the technical field of satellite navigation. The method specifically comprises the following steps of: 1, analyzing the sensitivity of satellite position errors to broadcast ephemeris parameter changes; and 2, measuring the orbit error in the sight distance direction of the satellite by adopting pseudo-range difference, measuring the orbit error orthogonal to the sight distance direction by adopting double-difference carrier phase, and constructing an observation equation about the position error of the satellite. According to the method, the orbit error is measured in a pseudo-range and carrier phase observed quantity combined mode, sensitivity analysis of the satellite position error on broadcast ephemeris parameter changes is fully utilized, an observation equation related to the satellite position error is converted into an observation equationrelated to broadcast ephemeris parameter deviation, higher observation precision is obtained, the ambiguity resolving complexity in carrier phase observation is reduced, a monitoring model can be built, and Beidou broadcast ephemeris maneuvering type fault monitoring can be achieved.

Description

technical field [0001] The invention relates to a Beidou broadcast ephemeris mobile fault monitoring method in consideration of parameter sensitivity, and belongs to the technical field of satellite navigation. Background technique [0002] With the development of satellite navigation system, applying it to aircraft precision approach service can effectively improve flight safety and efficiency. Among them, satellite broadcast ephemeris failure is one of the main risk sources affecting aircraft precision approach. In order to ensure the integrity of the user's positioning, the monitoring of broadcast ephemeris faults is essential. [0003] Broadcast ephemeris faults can be divided into maneuvering faults and non-maneuvering faults. Non-maneuvering faults can be effectively monitored by the method of predicting ephemeris minus today's ephemeris. For the detection of maneuvering faults, the receiver autonomous integrity monitoring algorithm (Receiver Autonomous Integrity Mo...

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Problems solved by technology

[0005] In order to solve the problems of large observation noise or complex ambiguity resolution in the Beidou broadcast ephemeris maneuver fault monitoring of pseudorange and carrier phase observations, the present invention provides a Beidou broadcast ephemeris maneuver fault monitoring considering parameter sensitivity Method, the orbit error is measured by combining pseudorange and carrier phase observations, combined with the sensitivity analysis of satellite position error to the change of broadcast ephemeris parameters, the observation equation is constructed, and the minimum detectable error (Minimum Detectable Error) is calculated according to the integrity risk requirements of the system. Error, MDE), choosing a reasonable MDE detection threshold can realize Beidou broadcast ephemeris mobile fault monitoring

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