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Differential positioning method

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

Active Publication Date: 2019-08-02
CNOOC INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0038] Below, the present invention will be explained in detail in combination with specific embodiments.

[0039] 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.

[0040] 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:

[0041]

[0042] 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, and Indicates the t...

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Abstract

The invention discloses a differential positioning method. The differential positioning method comprises the steps of receiving a space satellite signal within a region by a mobile end receiving machine; and calculating position coordinate according to a formula, calculating distance between the mobile end receiving machine to multiple satellites, substituting the distance to a formula to calculate new N, and continuing to solve a position of the mobile end receiving machine by iteration for many times. By the method, the influence brought by a linear error and a gauss error can be effectivelyeliminated, a positioning error can be controlled with 1 meter by iteration, results are distributed around an origin point, and thus, the differential positioning method which is smaller in error range and more convergence in result 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 ...

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Application Information

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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