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Method for positioning stationary user insufficient four satellites based on time lag

A satellite positioning system and satellite technology, applied in the field of satellite positioning, can solve problems such as inability to locate

Inactive Publication Date: 2007-11-21
任春阳
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Problems solved by technology

[0003] The main purpose of the present invention is to provide an algorithm for realizing positioning based on less than four satellites. In the case of satellites, the problem of positioning cannot be solved. Without adding additional devices, the positioning range of satellites can be improved, and satellite positioning can be widely used.

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  • Method for positioning stationary user insufficient four satellites based on time lag
  • Method for positioning stationary user insufficient four satellites based on time lag

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Embodiment Construction

[0004] 1) Determine the pseudo-distance ρ between the satellite and the ground fixed terminal:

[0005] Electromagnetic waves propagate in space at the speed of light c, given the sending time t1 on the star and the receiving time t2 at the terminal, according to

[0006] ρ=c*Δt calculates the pseudorange, where Δt=t2-t1.

[0007] 2) Introduce the clock difference variable t u :

[0008] An atomic clock with high stability is used as a reference clock on the satellite, but the clock of the receiver has a clock difference with the reference clock, which affects the accuracy of the distance calculation between the two ends. Therefore, the correction value c*t of the pseudo-range is introduced u , where t u This parameter is the difference between the on-board reference clock and the receiver reference clock.

[0009] 3) Obviously, when less than four satellites are detected, only less than four equations can be written according to the distance formula between two points, a...

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Abstract

A positioning method of static user based on time difference with less than four satellites includes observing satellite once by user at each time interval T, continuously observing twice when three or two satellites are detected, continuously observing four times when only on satellite is detected, receiving the positioning information on time-sharing and deriving out positioning information of user according to four equations when time interval T is satisfied with requirement of certain scope.

Description

technical field [0001] The invention relates to a satellite positioning technology, which is suitable for positioning when a static user can only detect less than four positioning satellites. The idea of ​​the algorithm is that the terminal receives positioning data multiple times. When the interval is very short, the error caused by the clock error change can be ignored within the allowable range; The error caused by the change can be ignored within the allowable range. In this way, the purpose of positioning can be achieved even when the terminal detects less than four positioning satellites at the same time. This algorithm is based on the traditional positioning algorithm for reference, and removes the time limit of the original algorithm, so that the positioning technology has stronger adaptability. Background of the invention [0002] Satellite positioning technology occupies an important position in the national economy. In addition to military applications, it has b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02G01S5/14G01S19/42
Inventor 任春阳马明辉张炎明桂荆京
Owner 任春阳
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