Single-frequency single-epoch GNSS fast orientation method under baseline constraints

A baseline-constrained, single-epoch technology, used in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices, etc., can solve problems such as long search time and difficulty in fixing ambiguity.

Active Publication Date: 2017-12-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] Aiming at the problem that the ambiguity is difficult to fix and the search time is long under the condition of single frequency and single epoch, the present invention proposes a single frequency and single epoch GNSS fast orientation method under baseline constraints. The main technical scheme is as follows

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  • Single-frequency single-epoch GNSS fast orientation method under baseline constraints
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  • Single-frequency single-epoch GNSS fast orientation method under baseline constraints

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing, method among the present invention is described in further detail:

[0051] Step 1, establishing a double-difference observation model;

[0052] Common errors such as atmospheric delay can be ignored under short baseline conditions, and the single-frequency double-difference observation model can be simplified as

[0053] E(Y)=Gb+Aa (11)

[0054] where E(·) represents the expectation operator, is a double-difference matrix composed of satellite-earth line-of-sight vectors, Λ is a constant coefficient diagonal matrix composed of GNSS signal wavelengths, where Y is double-difference observation, and a is double-difference ambiguity b is the baseline vector Δr ur ;

[0055]The stochastic model of the single-frequency double-difference observation equation can be directly written as

[0056]

[0057] in is the variance of non-difference coded observations, is the variance of the undifferenced carrier observatio...

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Abstract

The invention belongs to the fields of GNSS precise positioning and attitude determination, and discloses a single-frequency single-epoch GNSS quick positioning method at the presence of base line restriction. Through steps of establishing a double-difference observation model, utilizing least square for estimating a floating point ambiguity resolution and a floating point base line resolution, introducing a base line length for restraining an optimal resolution at the presence of base line restriction, utilizing a LAMBDA (least squares ambiguity decorrelation adjustment) algorithm for calculating an ambiguity-optimal candidate resolution and an ambiguity-suboptimal resolution, performing ambiguity checking, obtaining a base line resolution, etc., quick and accurate ambiguity resolution is realized. The single-frequency single-epoch GNSS quick positioning method settles an ambiguity resolution problem on condition of most difficult GNSS and single-frequency single-epoch without assistance. The single-frequency single-epoch GNSS quick positioning method can be applied in high-end measurement type receivers and low-cost receivers.

Description

Technical field: [0001] The invention relates to a fast GNSS orientation method, in particular to a single-frequency single-epoch GNSS fast orientation method under baseline constraints. Background technique: [0002] GNSS orientation is an important part of GNSS precision applications. It mainly determines the heading angle and pitch angle of the carrier in a specific coordinate system by calculating the baseline vector composed of two receivers fixed on the carrier. The core key technology is to realize Fast integer ambiguity resolution based on carrier phase observations. In order to realize the fast resolution of ambiguity, domestic scholars have proposed various methods successively. The difficulty of this technology lies in how to efficiently use the constraint of baseline length to achieve fast ambiguity search. [0003] Realizing fast GNSS orientation under single frequency and single epoch has always been an application problem that has received more attention in ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/55
CPCG01S19/55
Inventor 张晶宇吴美平
Owner NAT UNIV OF DEFENSE TECH
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