Pseudorange fingerprint matching-based quick area positioning method

Abstract

The invention provides a pseudorange fingerprint matching-based quick area positioning method which comprises the steps of 1, mapping and storing the time-space two-dimension pseudorange information with an expression I in the specification of each fixed point in a local positioning system relative to each satellite constellation, and building a pseudorange fingerprint database, wherein the time-space two-dimension pseudorange information is fingerprint information; 2, actually measuring the time-space two-dimension pseudorange information with an expression II in the specification of a certain position at a certain moment relative to one certain satellite constellation by using a user receiver, and storing the relative time-space two-dimension pseudorange information which serves as fingerprint comparing information; 3, performing pseudorange fingerprint matching and positioning by using the time-space two-dimension pseudorange information with the expression I in the specification in the constellation fingerprint database and the relative time-space two-dimension pseudorange information with the expression II in the specification via a matching algorithm. By adopting the method, positioning can be completed without relying on satellite ephemeris information; uncertainty errors, such as satellite clock error and signal propagation error, brought by satellite positioning are ignored through the matching algorithm; the influence on a matching result is very low, and the influence brought by a multipath effect, an electromagnetic effect and the like is reduced.

Description

technical field [0001] The invention belongs to the field of satellite navigation radio communication, and in particular relates to a fast area positioning method based on pseudo-range fingerprint matching. Background technique [0002] Global Navigation Satellite System (GNSS), as an important infrastructure of the country in the information age, can provide more accurate positioning and navigation services on a global scale. Among them, the pseudorange-based positioning model between the navigation satellite constellation and the user's mobile terminal—the three-sphere intersection model follows the Euclidean geometry principle, that is, it is based on the assumption of line-of-sight propagation. [0003] Line-of-sight propagation is a necessary condition for accurate measurement of positioning parameters. However, when users are in areas with severe occlusion, such as mountainous areas, deep forests, urban canyons, and indoors, the direct path is often blocked, and non-l...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the present invention provides a rapid regional positioning method based on pseudo-range fingerprint matching, which makes up for the defects of existing pseudo-range measurement technology, and solves the technology that the existing positioning method cannot be implemented in the non-line-of-sight scene mode Difficulties, reducing the impact of uncertainty errors on positioning accuracy,

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