A Tropospheric Delay Correction Method Applicable to China without Meteorological Parameters

A technology of tropospheric delay and meteorological parameters, applied in the field of global navigation systems, can solve the problems of less accuracy and applicability, and achieve the effect of simple structure and high precision

Active Publication Date: 2017-12-22
SOUTHEAST UNIV
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Problems solved by technology

However, the above model is based on the local or global tropospheric delay established by meteorological analysis data in North America, and there are few studies on its accuracy and applicability in China.

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  • A Tropospheric Delay Correction Method Applicable to China without Meteorological Parameters
  • A Tropospheric Delay Correction Method Applicable to China without Meteorological Parameters
  • A Tropospheric Delay Correction Method Applicable to China without Meteorological Parameters

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Embodiment Construction

[0037] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0038] The invention discloses a method for correcting tropospheric delay without meteorological parameters, which is applicable to Chinese regions, comprising the following steps:

[0039] S1: Determine the relationship of tropospheric delay with time in China: use a parabolic model based on a quadratic function to represent the relationship of tropospheric delay with time in China, where the parabolic model is shown in formula (1):

[0040]

[0041] In formula (1), doy is the annual cumulative day, a and c are the coefficients, and ZTD is the tropospheric delay in China;

[0042] Because the tropospheric delay in China has an annual periodicity in time, and the tropospheric delay in the middle and high latitudes of China changes sharply in summer and slowly in winter, so the parabolic model can accurately reflect the temporal variation of trop...

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Abstract

The invention discloses a meteorological-parameter-free troposphere delay correction method suitable for China. The method comprises the following steps: S1, determining a change relation of a troposphere delay in the region of China as time changes; S2, determining a change relation of the troposphere delay in the region of China as altitude changes; S3, determining a change relation of the troposphere delay in the region of China as latitude and longitude change; and S4, calculating the troposphere delay and determining a bilinear model. According to the invention, the model structure is simple, and a troposphere delay predicted value at a station can be directly obtained simply by inputting the longitude, the latitude, the elevation and the day of year of the station. The model has quite small deviations in China and better accords with the change rule of a troposphere troposphere time delay time delay sequence in China. The precision is also quite high even in a high-altitude region, and the model is better than a conventional EGNOS model.

Description

technical field [0001] The invention relates to the field of global navigation systems, and is a method for correcting tropospheric delay without meteorological parameters suitable for China. Background technique [0002] Tropospheric delay is the main reason that affects the positioning accuracy of satellite navigation, especially the accuracy in the elevation direction. At present, the main method of tropospheric delay correction is the model correction method. The model correction method establishes a functional relationship that can reflect the tropospheric delay based on different assumptions and influencing factors. According to whether meteorological parameters are required for model calculation, it can be divided into models requiring meteorological parameters and models without meteorological parameters. However, in actual GNSS navigation and positioning applications, most users (including some IGS tracking stations) cannot obtain the meteorological parameters at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/38
CPCG01S19/38
Inventor 胡伍生韩伟夏晓明
Owner SOUTHEAST UNIV
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