Accurate one-point positioning method for single-frequency GPS receiver

A GPS receiver, precise single-point positioning technology, applied in the direction of positioning, beacon systems using radio waves, measuring devices, etc.

A GPS receiver, precise single-point positioning technology, applied in the direction of positioning, beacon systems using radio waves, measuring devices, etc.

CN101403790AActive Publication Date: 2009-04-08杭州亚龙智能科技有限公司
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  • Accurate one-point positioning method for single-frequency GPS receiver
  • Accurate one-point positioning method for single-frequency GPS receiver
  • Accurate one-point positioning method for single-frequency GPS receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] refer to Figure 12 , a precise single-point positioning method for a single-frequency GPS receiver, comprising a GPS data reading and preprocessing step, an error correction solution step, and a result output step, the preprocessing step including detecting and repairing a cycle slip, The detection and repair steps of the cycle slip include:

[0125] 1) The m carrier phase observations without cycle slip φ i Bring into formula (1) for polynomial fitting;

[0126] i=1,2,...m; m>(n+1)

[0127] (1)

[0128] The polynomial coefficients in the formula are obtained by the least square method, and according to the fitted residual V i Calculate the error:

[0129] σ ( j ) = V i V i m -...

Embodiment 2～3

[0224] Examples 2-3: Comparison of solution accuracy between grid model and semi-sum correction method

[0225] In this embodiment, the data of IGS tracking stations BJFS (bjfs0150.07O) and WUHN (wuhn0150.07O) on January 15, 2007 are respectively solved by ionospheric grid model and half-sum correction method. In the data processing, only the L1 and C / A code data in the observed values ​​are used for the calculation of the data of the IGS tracking station. Statistical results such as Figure 8-11 shown.

[0226] As can be seen from the figure:

[0227] 1) Using the grid model to correct, the accuracy of 5 decimeters can be achieved in the N and E directions. But the accuracy in the U direction is about 1 meter;

[0228] 2) Using the semi-sum correction, the accuracy of about 2 decimeters can be achieved in the N, E, and U directions;

[0229] 3) It is obvious that the semi-sum correction method achieves higher accuracy than the grid model correction method. The main reas...

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Abstract

The invention relates to a precise single point positioning method of a single-frequency GPS receiver, which comprises GPS data reading and pretreating steps, error correcting and resolving steps and a result output step, wherein the pretreating step comprises the cycle slip exploration and restoration which comprises the following steps: (1) m non-cycle-slip carrier phase observed values Phi are substituted into a formula and the polynomial fitting is then carried out; (2) a calculated polynomial coefficient is used for extrapolating a carrier phase observed value Phi of the next epoch which is then compared with the actual observed value Phi; (3) the carrier phase observed values of the first epoch and the i-1 epoch are utilized to obtain the variance ratio of the carrier phase observed values. The invention comprehensively utilizes the polynomial fitting method and the carrier phase variance ratio method to explore the cycle slip, combines the gross error correction to realize the precise single point positioning of a single-frequency GPS receiver, thereby effectively realizing the high-precision positioning and navigation of a GPS system.

Description

(1) Technical field [0001] The invention relates to a precise single-point positioning method for a single-frequency GPS receiver. (2) Background technology [0002] The GPS global positioning system is the abbreviation of the acronym NAVSTAR / GPS of the English "Navigation Satellite Timing And Ranging / Global Positioning System". It is a new generation of satellite navigation system developed by the U.S. Department of Defense in the 1970s. It is a satellite-based radio navigation and positioning system with omnipotence (land, ocean, aviation and aerospace), global, all-weather, continuity and Real-time navigation, positioning and timing functions can provide various users with precise three-dimensional positioning, speed measurement and time services. At present, GPS, as a new generation of satellite navigation and positioning system, has been widely used in the fields of military, transportation, surveying and mapping, high-precision time comparison, and resource investigat...

Claims

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Application Information

Patent Timeline
08 Apr 2009
Publication
CN101403790A
IPC
G01S1/02; G01S5/02
Inventors
徐慧英; 朱信忠