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Method for Determining Ellipsoid Parameters Based on Regional GNSS and Precise Ranging Scale Ratio Estimation Method

A technology of precise distance measurement and scale ratio, which can be used in measuring devices, measuring instruments, surveying and navigation, etc., and can solve the problems of inconsistency and low accuracy of data projection reduction.

Active Publication Date: 2017-11-03
POWERCHINA XIBEI ENG
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Problems solved by technology

[0003] The present invention provides a method for determining ellipsoid parameters based on the regional GNSS and precise ranging scale ratio estimation method. By estimating the relationship between the regional GNSS and precise ranging scale ratio, the relationship between the scale ratio and the ellipsoid parameters is established at the projection reduction level. The equivalent conversion method mainly solves the problem of low precision of data projection reduction caused by the inconsistency of the scale of regional precision ranging and GNSS measurement results

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  • Method for Determining Ellipsoid Parameters Based on Regional GNSS and Precise Ranging Scale Ratio Estimation Method

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[0066] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments, but the present invention is not limited to the specific embodiments.

[0067] The present invention provides a method for determining ellipsoid parameters based on regional GNSS and precision ranging scale ratio estimation method, such as figure 1 shown, including the following steps:

[0068] Step 1, define the scale ratio;

[0069] Set up two known points a and b, measure the distance between a and b, and obtain the precise measured side length D ab Inverse calculation of side length DG with GNSS results ab , calculate D according to formula (1) ab Relative to DG ab The ratio L of , define the ratio L as the scale ratio, then

[0070]

[0071] Formula (1) is the reduced scale ratio of the side length relative to the measured ground control network. Scale the side length scale ratio according to the determined scale ratio, and combine tran...

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Abstract

The invention discloses a method for determining ellipsoid parameters based on an area GNSS and precise distance measurement scale ratio estimation method. The area GNSS and precise distance measurement scale ratio estimation method includes defining of a scale ratio, determining of a weighted scale ratio, a scale ratio difference analysis method and scale ratio difference estimation, and the method can solve the problem that due to influence of factors such as atmospheric refraction, a scale change is caused; and to determine reference ellipsoid parameters based on the estimation method can achieve relatively high outer coincidence precision, the method provided by the invention is simple and easy to implement, and is relatively effective for a small region of an engineering surveying control network jointly established by adoption of GNSS measurement and a short-distance precise distance measurement method.

Description

technical field [0001] The invention belongs to the technical field of GNSS side length reduction, and in particular relates to a method for determining ellipsoid parameters, in particular to a method for determining ellipsoid parameters based on a regional GNSS and precision ranging scale ratio estimation method. Background technique [0002] The accuracy of short-range precision ranging is generally better than that of GNSS measurement, so GNSS measurement and precision ranging methods are commonly used in engineering to establish engineering survey control networks. The position reference generally adopts the single-point positioning coordinates of the station, and the accuracy is not high. These factors will cause the scale to change in the GNSS measurement and data processing links. There is a large scale difference between the precise ranging side length and the back-calculated side length of the GNSS result. Inaccurate ellipsoid parameters determined for compensating ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/45G01C15/00
CPCG01C15/00G01S19/45
Inventor 李祖锋
Owner POWERCHINA XIBEI ENG
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