An Integral Method for Estimated Tropospheric Delay for Oblique Paths

Abstract

The invention provides an integration method for estimating oblique path troposphere delay. The method is characterized in that through data of an atmospheric temperature, a pressure intensity and pressure of water vapor provided by a GNSS observation station, the oblique path troposphere delay under different angles of elevation can be accurately acquired under the condition of guaranteeing precision. By using the estimation integration method, total zenith delay does not need to be estimated and oblique path delay of different satellite height angles does not need to be acquired according toa projection function. An amount of calculation is relatively simple.

Description

technical field [0001] The invention belongs to the fields of GNSS positioning and GNSS meteorology, and particularly relates to a method for estimating the oblique path delay value of the electromagnetic wave troposphere at different elevation angles by using the temperature, pressure and water vapor pressure values ​​provided by the observation station. Background technique [0002] When the GNSS electromagnetic wave signal passes through the troposphere, due to the change of the relative refraction medium, the electromagnetic wave will bend during the propagation process, and the resulting path delay is the tropospheric delay. There is basically no dispersion effect in the troposphere, so the tropospheric delay of electromagnetic waves cannot be eliminated by dual-frequency correction. Usually, mathematical models or atmospheric products can be used to accurately estimate the tropospheric delay of oblique paths. After obtaining the oblique path delay of different satelli...

AI Technical Summary

Problems solved by technology

Since only three parameters of surface temperature, pressure and water vapor pressure are provided, the accuracy of the zenith tropospheric delay estimated by the classic tropospheric delay is limited

In addition, affected by the discontinuity of the atmospheric refractive index, the accuracy of the projection function at low satellite elevation angles (generally below 15°) is poor, so the accuracy of the oblique path tropospheric delay obtained is poor

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