Method for eliminating delay errors of troposphere of GNSS atmospheric probing data

Abstract

The invention discloses a method for eliminating delay errors of the troposphere of GNSS atmospheric probing data. The method for eliminating the delay errors of the troposphere of the GNSS atmospheric probing data is characterized in that a GPT model, a UNB3m model and a classic troposphere model are merged together, the classic troposphere model is a Hopfield or Saastamoinen model. The method for eliminating the delay errors of the troposphere of the GNSS atmospheric probing data includes the following steps that the temperature and the air pressure of a probing station are calculated out by means of the GPT model, the hydrosphere pressure of the probing station is calculated out by means of the UNB3m model and finally, a global mapping function is used for calculating out delay correction of the troposphere in the gazing direction of a satellite receiver. The method for eliminating the delay errors of the troposphere of the GNSS atmospheric probing data is capable for accurately calculating out a priori value of troposphere delay with insufficient actually measured meteorological data and can be applied to the fields such as GNSS positioning and GNSS meteorology.

Description

technical field [0001] The invention belongs to the GNSS atmospheric detection technology. The GNSS technology provides a powerful tool for atmospheric detection, which has the characteristics of no calibration, all-weather, high precision, high vertical resolution, and uniform global coverage; it is particularly related to accurately determining the GNSS atmospheric detection. Elimination method of tropospheric delay error. Background technique [0002] Use GNSS technology to obtain relevant parameters such as the temperature, pressure and humidity of the earth's atmosphere. In GNSS observations, the delay caused by electromagnetic signals passing through the atmosphere is one of the main sources of error, referred to as atmospheric error. Various GNSS errors include satellite clock error, receiver clock error, atmospheric delay and other errors; GNSS atmospheric error mainly includes tropospheric delay and ionospheric delay. Among them, the ionospheric delay is related t...

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Problems solved by technology

[0004] The Hopfield and Saastamoinen models require meteorological parameters at the location of the station, but the general station does not have the conditions for the measured meteorological parameters. If the standard meteorological parameters are used instead, the accuracy of the model will be reduced; the scope of application of the EGNOS and UNB3m models is small, and the models on a global scale The accuracy is uneven; the method of estimating tropospheric delay by parameters is affected by other parameters to be estimated, and it is difficult to guarantee both accuracy and timeliness. For example, the high-precision tropospheric delay data provided by CODE Center has a lag time of five days

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