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GNSS tri-frequency precise single-point positioning ambiguity fixing method

A precise single-point positioning technology with fixed ambiguity. It is applied in the field of satellite navigation and positioning, and can solve the problems of limited application scope and long initialization time.

Active Publication Date: 2015-04-01
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, based on the fact that most GPS satellites currently in orbit send dual-frequency pseudo-range and carrier signals, the ambiguity of precise point positioning requires a long initialization time, which limits its application range.

Method used

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  • GNSS tri-frequency precise single-point positioning ambiguity fixing method
  • GNSS tri-frequency precise single-point positioning ambiguity fixing method
  • GNSS tri-frequency precise single-point positioning ambiguity fixing method

Examples

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Embodiment Construction

[0052] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0053] Step 1: Use the original pseudorange and carrier phase observations to form two ionosphere-free composite observations

[0054] The original pseudorange and carrier phase observations of the three GNSS frequencies are:

[0055] L i = ρ + t r , i - μ i I 1 + mτ + λ i ...

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Abstract

The invention relates to a GNSS tri-frequency precise single-point positioning ambiguity fixing method and belongs to the technical field of satellite navigation and positioning. The GNSS tri-frequency precise single-point positioning ambiguity fixing method comprises the steps of achieving precise single-point positioning resolving method by utilizing a tri-frequency pseudo-range and carrier phase observed value based on precise satellite ephemeris and clock correction provided by an IGS and phase delay correction resolved by a network; utilizing extra-wide-lane phase pseudo-range combination to resolve extra-wide-lane complete-cycle ambiguity, combining a resolved ionized-layer-free combination observed value ambiguity to resolve narrow-lane complete-cycle ambiguity and finally obtaining ambiguity-fixed high-precision single-point positioning result. By means of the GNSS tri-frequency precise single-point positioning ambiguity fixing method, the number of parameters to be estimated is decreased, computing efficiency is improved, and meanwhile precise single-point positioning ambiguity resolving success rate, positioning precision and reliability are improved.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and relates to a method for fixing the ambiguity of GNSS triple-frequency precise single-point positioning. Background technique [0002] Global Navigation Satellite System (GNSS) can provide all-weather, all-weather, high-precision positioning, navigation and timing services for the vast number of users on the earth's surface and near-Earth space, and has been widely used in national defense, sea, land and air transportation , surveying and mapping, mobile communications, electric power, electronic finance, precision agriculture, and disaster reduction and relief are important space infrastructure for expanding human activities and promoting social development. [0003] GNSS Precise Point Positioning (PPP) technology is one of the key technologies for global satellite navigation systems to provide precise location services. It uses satellite precise ephemeris and sat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 于兴旺刘刚卢艳娥何盼
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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