A method for multiplying positioning precision in a satellite navigation positioning system

Abstract

The invention discloses a method for multiplying positioning precision in a satellite navigation positioning system. In the method, each navigational satellite in the satellite navigation positioning system downloads pseudo stochastic noise codes, navigation messages, and wide-area enhanced information via multiple carrier frequency points; a user terminal measures and corrects the track errors of the navigational satellites, ionosphere time delay, troposphere time delay, and multipath errors simultaneously and individually with the multiple carrier frequency points in order to achieve pseudo range measurement between the navigational satellites and the user terminal on the multiple carrier frequency points; and by using a pseudo range observational equation of the multiple carrier frequency points, the accurate coordinate of the position of the user terminal can be calculated via iterative computations. The method is capable of well increasing the positioning precision of the user terminal and substantially improving the navigation positioning performance of the satellite navigation positioning system.

Description

technical field [0001] The invention relates to satellite navigation and positioning technology, in particular to a method for doubling the positioning accuracy in a satellite navigation and positioning system, which is applicable to a navigation satellite that can simultaneously downlink multiple carrier frequency points and modulate pseudo-random noise codes and multi-frequency navigation messages. satellite navigation system. Background technique [0002] In the satellite navigation and positioning system, the positioning accuracy of the user terminal is mainly determined by the spatial layout of the system constellation and the equivalent pseudo-range measurement error. Usually, the positioning error of the satellite navigation and positioning system can be described by the following formula: [0003] σ i = DOP i ·σ UERE (1) [0004] Among them, σ i is the positioning error of the user terminal, i=1, 2, 3, 4, and 5 correspond to the plane, elevation, position, ...

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Problems solved by technology

[0006] In general, the pseudo-range measurement values ​​of multiple carrier frequency points of the same navigation satellite and the satellite ephemeris have related parts, at this time the positioning accuracy of the user terminal cannot be estimated by formula (1); at the same time, in the existing global satellite In the navigation and positioning system, the number of carrier frequency points that each navigation satellite can downlink at the same time is not the same, and the invention cannot be simply applied: the method for reducing the pseudo-range measurement error in the multi-carrier positioning method in satellite navigation (patent application number: 201110228917.3)

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