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A Differential Positioning Method

A differential positioning and mobile terminal technology, applied in the field of satellite positioning, can solve the problems of divergent results, large error range, and positioning accuracy to be improved, and achieve the effects of easy promotion, high practical value, and low computational complexity

Active Publication Date: 2021-04-30
CNOOC INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the usual differential positioning method has a large error range, generally around tens of meters, and the results are relatively divergent, and the positioning accuracy still needs to be improved

Method used

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Embodiment Construction

[0040] Below, the present invention will be explained in detail in combination with specific embodiments.

[0041] Firstly, the base station receiver and the mobile terminal receiver are set, wherein the position of the base station receiver is determined. Advantageously, the position of the base station receiver is set as the coordinate origin through spatial coordinate transformation.

[0042] The base station receiver and the mobile terminal receiver receive the signal of the space satellite j, and output the observation distance information between the satellite j and the base station receiver (or mobile terminal receiver), the measurement pseudo of the base station receiver (or mobile terminal receiver) The distance is as follows:

[0043]

[0044] Among them, P i j Indicates the observation distance from receiver i (base station receiver or mobile receiver) to satellite j, ρ i j Indicates the actual distance from receiver i to satellite j, with Indicates the ...

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Abstract

Disclosed is a differential positioning method, including: a mobile terminal receiver receives space satellite signals in an area; calculates the position coordinates according to a formula, calculates the distance between the mobile terminal receiver and multiple satellites, and then substitutes it into the formula to calculate a new N , continue to solve the position of the mobile receiver through multiple iterations. This method can effectively remove the influence of linearity error and Gaussian error. After iteration, the positioning error can be controlled within 1m; the results are distributed around the origin; thus, a differential positioning method with a smaller error range and more aggregated results is obtained.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning and relates to a differential positioning method. Background technique [0002] my country has a vast territory, with a land area of ​​9.6 million square kilometers. In addition, my country's oceans include the Bohai Sea, the Yellow Sea, the East China Sea, and the South China Sea, and the ocean area is still millions of square kilometers. In order to meet the needs of high-precision positioning and navigation in the fields of sea, land and air, my country has independently developed the Beidou navigation system. It consists of 5 geostationary orbit satellites and 30 non-geostationary orbit satellites; among them, 27 medium orbit satellites are evenly distributed on 3 orbital planes forming an angle of 120 degrees. From an overall point of view, in the middle and low latitude regions, any satellite signal receiver can receive more than 4 satellite signals, and then use the precise ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/41G01S19/42
CPCG01S19/41G01S19/42
Inventor 彭义东施建衡林继斌武宇杨超宁斯佳龙剑侯金奎
Owner CNOOC INFORMATION TECH