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Differential positioning method for ground-based augmentation system based on extended Kalman filtering

A ground-based augmentation system and differential positioning technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve the divergence of filtering results, changes in constellations, occlusion of obstacles, movement of carriers and reception Machine failure and other problems, to achieve the effect of accurate judgment, good real-time performance, and easy engineering realization

Inactive Publication Date: 2018-09-18
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology

When the traditional Hatch filter smoothes the pseudorange, the carrier phase integer ambiguity N needs to remain unchanged, but in practice, due to the change of the satellite constellation, the occlusion of obstacles, the movement of the carrier, and the failure of the receiver, the filter smoothing During the process, the receiver cycle slip phenomenon occurs from time to time, if the cycle slip is not processed, the filtering results will diverge

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  • Differential positioning method for ground-based augmentation system based on extended Kalman filtering
  • Differential positioning method for ground-based augmentation system based on extended Kalman filtering
  • Differential positioning method for ground-based augmentation system based on extended Kalman filtering

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[0035] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] The present invention provides a ground-based augmentation system differential positioning method based on extended Kalman filter, figure 1 For the GBAS difference calculation flow chart, such as figure 1 As shown, the superscript G is used for ground systems and the superscript A for air systems. Both the ground and air systems use carrier phase smoothing filters to smooth the pseudorange noise, and the position of the ground reference receiver is obtained through precise measurement in advance. The ground station uses the ephemeris to calculate the real-time position of each satellite, and then can calculate the real distance between the satellite and the reference receiver (R G ), according to the pseudorange observed by the receiver, the pseudorange differential correction value can be further obtained, and this part of the error ...

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Abstract

The invention discloses a differential positioning method for a ground-based augmentation system based on extended Kalman filtering. The differential positioning method comprises a carrier phase smoothing pseudorange step and a differential positioning step based on extended Kalman filtering. The carrier phase smoothing pseudorange step is implemented by judging whether a carrier phase has a cycleslip according to a carrier difference. The differential positioning step based on extended Kalman filtering is implemented by establishing a position velocity and acceleration (PVA) model, and estimating the optimal real-time position of an aircraft by means of an extended Kalman filter. The differential positioning method can effectively solve the problems of poor positioning precision caused by random errors such as user-side noise and multipaths of the ground-based augmentation system (GBAS) on the basis of carrier phase smoothing pseudorange and Kalman filter data smoothing advantages.

Description

technical field [0001] The invention belongs to the field of satellite-based navigation augmentation systems, and in particular relates to a differential positioning method for ground-based augmentation systems based on extended Kalman filtering. Background technique [0002] The application of satellite navigation system in civil aviation can effectively improve the flight safety and efficiency of aircraft. The Ground Based Augmentation System (GBAS) based on differential positioning is an important development direction of aircraft precision approach and landing in the future, and it is also an important development direction of international civil aviation. One of the core infrastructures of Performance Based Navigation (PBN) recommended by the organization. GBAS is mainly composed of three parts: user system, space system and ground system. The ground system includes several reference stations, central processing station and differential data broadcasting station. The r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/41
CPCG01S19/41
Inventor 胡杰孙奇伟沈志平单尧石潇竹李贺
Owner THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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