Air sounding data-based northern hemisphere troposphere delay correction method

A tropospheric delay and tropopause technology, applied in the field of global navigation systems, can solve the problems of poor model accuracy, no consideration of latitude and annual cycle changes, limited correction effect, etc., to achieve the effect of improving calculation accuracy

Active Publication Date: 2017-06-30
SOUTHEAST UNIV
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Problems solved by technology

In a local area or using regional meteorological data, the model accuracy of this type of model is poor, and the factors of latitude and annual cycle change are not considered, especially in areas with vast areas and complex environments. The correction effect is relatively limited

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  • Air sounding data-based northern hemisphere troposphere delay correction method
  • Air sounding data-based northern hemisphere troposphere delay correction method
  • Air sounding data-based northern hemisphere troposphere delay correction method

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Embodiment Construction

[0027] The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0028] This specific embodiment discloses a method for correcting the tropospheric delay in the northern hemisphere based on sounding data, including the following steps:

[0029] S1: Calculate the tropospheric delay of the sounding data of the station, denoted as ZTD 0 ,details as follows:

[0030] This specific embodiment adopts the sounding data of 277 stations in the northern hemisphere in 2010. The latitude spans from 6.96°-82.5°, and the distribution area ranges from the tropics to the arctic circle. Taking station 78897 as an example, the sounding data provide different isobaric surface layer atmospheric characteristic layer and wind layer data, such as figure 1 shown. Atmospheric characteristic layer parameters include geopotential height (HGHT), air temperature (TEMP), dew point temperature (DWPT), and re...

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Abstract

The invention discloses an air sounding data-based northern hemisphere troposphere delay correction method comprising the following steps: in step S1, troposphere delay of air sounding data at an observation station is calculated and denoted as ZTD0; in step S2, a Hopfield model is used for calculating the troposphere delay which is then denoted as ZTD(H); in step S3, latitude and day-of-year information of the observation station is increased based on a Hopfield model formula, and a non-linear equation is built; in step S4, the troposphere delay ZTD0 calculated via the step S1 is taken as a truth value, a least square method is used for determining all coefficients of the non-linear equation, a final improvement model equation can be determined, and precision of the equation is verified. Compared with a conventional Hopfield model and a conventional Saastamoinen model, the method disclosed in the invention is advantaged by effectively improved calculation precision.

Description

technical field [0001] The invention relates to the field of global navigation systems, in particular to a method for correcting the troposphere delay in the northern hemisphere based on sounding data. 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. The tropospheric delay correction model is an empirical formula obtained by analyzing meteorological data, and there are differences due to different analytical methods. According to whether meteorological parameters are required for model calculation, it can be divided into models requiring meteorological parameters and models without meteorolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/40
CPCG01S19/40
Inventor 胡伍生陈永潮王西地
Owner SOUTHEAST UNIV
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