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A single-frequency high-precision positioning method based on gnss

A positioning method and high-precision technology, applied in the field of navigation, can solve problems such as poor positioning accuracy and limited applications

Active Publication Date: 2019-04-23
BEIHANG UNIV
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Problems solved by technology

However, its positioning accuracy is poorer than that of dual-frequency GPS, which limits its application in high-precision scenarios

Method used

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  • A single-frequency high-precision positioning method based on gnss
  • A single-frequency high-precision positioning method based on gnss
  • A single-frequency high-precision positioning method based on gnss

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Embodiment Construction

[0169] The following will combine figure 1 And the technical scheme further describes the specific implementation process of the present invention in detail.

[0170] The present invention is a GNSS-based single-frequency high-precision positioning method, see figure 1 As shown, the steps are as follows:

[0171] Step 1: Solve the initial epoch position

[0172] Construct the theoretical value Z of GRAPHIC combined observations.

[0173] From formula (4), it can be seen that the GRAPHIC combined observation equation is a state variable x=(x r ,yr,z r ,δt r ,N 1 …N p ) T The ambiguity subscript represents the number of GPS satellites observed in the current epoch. The calculated value Z of GRAPHIC combined observations is calculated as follows:

[0174]

[0175] Where ρ 0 The relationship is as follows:

[0176]

[0177] Among them, the symbol "~" in the above formula represents the estimated value, For the three position estimation components of the receiver, (x s ,y s ,z s ) T Are t...

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Abstract

The invention relates to a single frequency high precision positioning method based on GNSS. The method comprises steps that 1, preparation work is carried out; 2, initial epoch position solution is carried out; 3, a carrier wave phase epoch difference observation model is constructed, and a relative position variance is solved; 4, the fuzziness information and the position information are transmitted; 5, the fuzziness information and the variance information are adjusted; 6, a fuzziness and position information virtual observation equation is constructed; and 7, least square estimation for a GRAPHIC combined observation equation and a virtual observation equation is commonly carried out, and a final positioning result is solved. Through the method, a GRAPHIC combined kinetics positioning algorithm aided by carrier wave phase epoch difference is utilized, kinetics navigation positioning precision is improved, precise ephemeris energy is employed to carry out high precise orbit determination for LEO satellites, and broadcast ephemeris energy is employed to realize real-time navigation positioning. The method is advantaged in that the method is not influenced by satellite change in a navigation positioning process, high reliability, low cost and simple data processing are realized, and the method is suitable for popularization and application.

Description

Technical field [0001] The present invention provides a high-precision single-frequency positioning method based on GNSS (Global Navigation Satellite System), which relates to a method for using GNSS to calculate absolute positions of aircraft, ground and sea moving carriers, and belongs to the technical field of navigation. Background technique [0002] The Global Positioning System (GPS) is a satellite navigation system established by the United States, which can provide users with real-time three-dimensional navigation services. With the widespread application of GPS, many scientific research institutions began to pay attention to the application of its single receiver in the precision orbit determination of low-orbit satellites, as well as the high-precision positioning of ground and sea, stationary or moving carriers. At present, the above-mentioned research can be divided into two directions. First, use dual-frequency GPS for precise positioning; this method makes full use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 陈培张键孙秀聪魏华波
Owner BEIHANG UNIV
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