Method for improving passive positioning accuracy in dipper system

A passive positioning, Beidou technology

Active Publication Date: 2011-07-20
BEIJING BDSTAR NAVIGATION CO LTD +1
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for improving the accuracy of passive positioning in the Beidou system, which can fundamentally solve the problem of large passive positioning errors

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  • Method for improving passive positioning accuracy in dipper system
  • Method for improving passive positioning accuracy in dipper system

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Embodiment Construction

[0021] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention.

[0022] The present invention analyzes a large number of positioning test results, and obtains that the Beidou passive positioning error is large, which is mainly caused by the strength of the signal and the stability of the loop tracking. Therefore, the technical solution of the present invention eliminates the problem of large positioning errors and fundamentally solves the problem of large positioning errors according to the size of the signal-to-noise ratio of each beam and the size of the carrier tracking loop error.

[0023] The "Beidou-1" system has a total of 3 satellites and 6 beams. To achieve passive positioning, one beam signal from each of the three satell...

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Abstract

The invention discloses a method for improving the passive positioning accuracy in a dipper system, capable of radically solving the problem of big passive positioning error. The method comprises: according to the big and small relation of signal-noise ratio of two beams of each satellite and the big and small relation of values of the signal-noise ratio counter of two beams, adding and subtracting the values of the signal-noise ratio counter of two beams; judging whether the values of the signal-noise ratio counter of two beams after the adding and subtracting operation reach the threshold ofthe predetermined signal-noise ratio counting value; for the beam of which the signal-noise ratio counter value reach the threshold of the signal-noise ratio counting value, judging whether the looptracking is stabilizing; if the loop tracking is stabilizing, adopting the beam of which the signal-noise ratio counter value reach the threshold of the signal-noise ratio counting value to engage inthe passive positioning. the invention radically solves the problem of the big passive positioning accuracy error in the dipper system.

Description

technical field [0001] The invention relates to a passive Beidou receiver, in particular to a method for improving the passive positioning accuracy in the Beidou system. Background technique [0002] The first-generation satellite navigation and positioning system currently built in my country uses two geostationary orbit satellites to provide navigation and positioning services for ground, sea and air users. Compared with GPS, Beidou positioning system has the advantages of fewer satellites, all-weather fast positioning and simple message communication function. However, due to the active positioning method and regional coverage capability of the Beidou system, it has brought certain restrictions to the wide application of ship platforms. In order to solve the concealment and security problems brought about by active positioning, the realization of Beidou passive positioning has become a fundamental problem that needs to be solved urgently in the application of Beidou syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02
Inventor 不公告发明人
Owner BEIJING BDSTAR NAVIGATION CO LTD
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