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Parity vector method-based double-satellite failure recognition method

A technology of parity vector method and fault identification, which is applied in the field of satellite navigation and positioning, and can solve problems such as misjudgment, missed judgment, and fault offset offset

Inactive Publication Date: 2013-01-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] Traditional faulty satellite identification methods cannot be directly used to identify multiple faulty satellites, and the identification method for multiple faulty satellites is not yet perfect
For example, when the parity vector method is used to identify two faulty satellites, the fault bias offset will occur, which will lead to missed and misjudged situations

Method used

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  • Parity vector method-based double-satellite failure recognition method
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  • Parity vector method-based double-satellite failure recognition method

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Embodiment

[0088] Fig. 1 has provided flow process of the present invention. The specific method is as follows:

[0089] (1), remove satellite i from existing n satellites, initially i is 1;

[0090] (2), carry out fault detection to the remaining (n-1) satellites, and the judgment amount of fault detection

[0091] σ ^ n - 1 = SSE ( n - 1 ) - 4 - - - ( 13 )

[0092] Calculate the fault detection threshold σ for (n-1) satellites T，(n-1) :

[0093] σ T , ...

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Abstract

The invention relates to global satellite navigation system receiver autonomous integrity monitoring technology and discloses a parity vector method-based double-satellite failure recognition method, aiming at the problems of false positives and false negatives caused by fault deviation offsetting when the parity vector method is used for recognizing two fault satellites. According to the technical scheme, the parity vector method is used for recognizing one fault satellite; with the fault satellite as the basis, four fault-free satellites are found out, and the information of the fault-free satellites is used for roughly locating, so that the fault satellites can be recognized; the recognized fault satellites are removed, and then the position resolution is carried out again, so that the locating accuracy is improved; therefore, the problems of false positives or false negatives caused by fault deviation offsetting can be avoided. The method solves the problem of the fault deviation offsetting caused by parity vector residual error and realizes the detection and the recognition for a plurality of fault satellites. After the method is used for detecting and recognizing satellite failure, the locating accuracy is improved. The method is mainly used for monitoring the autonomous integrity of a global satellite navigation system receiver.

Description

technical field [0001] The present invention relates to satellite navigation and positioning technology, in particular to a Global Navigation Satellite System (Global Navigation Satellite System, GNSS) receiver autonomous integrity monitoring (Receiver Autonomous Integrity Monitoring, RAIM) method. Background technique [0002] While obtaining the navigation solution, the GNSS receiver must take into account the influence of the pseudo-range bias on the navigation solution. The main factors causing the pseudo-range deviation are large satellite clock drift, incorrect navigation message data, and faults of satellite components, which are collectively referred to as satellite faults here. Since the system cannot guarantee the response time to satellite failures, the rapid monitoring of satellite failures can only be carried out at the user end, and thus the autonomous integrity monitoring method of receivers has emerged. [0003] RAIM utilizes redundant ranging signals to det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23
Inventor 曾超滕云龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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