Research On Water Vapor Inversion And Atmospheric Enhanced Precision Single-point Positioning Based On GPS Technology

In recent years,GNSS water vapor detection technology has developed rapidly.The real-time,high-precision,all-weather,and economic characteristics of this technology make it widely used in the field of meteorology.With the continuous expanding of the coverage of the regional continuous operation reference network,the establishment of a sound operation monitoring network in mainland China has made it possible to carry out water vapor monitoring without actually measuring atmospheric parameters.Through the GNSS measurement station data,the precipitation information can provide data for the prediction of water vapor in the field of GNSS meteorology.In this paper,combined with the applicable theory of atmospheric water vapor inversion and the precise single-point positioning theory,the following studies have been done:In this paper,combined with the relevant theory of atmospheric water vapor inversion and the precise single-point positioning theory,the following studies have been done:1.Based on the water vapor inversion theory and the weighted average temperature model theoretical formula,using the three consecutive years of original sounding measurements from 2017 to 2019,the weighted average temperature model in the Fangshan area of Beijing was fitted.The experimental results show that the regional model is consistent with the global Bevis model's final result trend,and the regional model is closer to the weighted average temperature computed by the original integration.The average deviation and root mean square error decrease from 13.29 mm and 16.23 mm to 7.63 mm and 9.13 mm,respectively.The average deviation of the depreciable precipitation at 0 and 12 o'clock from the regional model decreased from 4.7mm and 5.9mm to 3.9mm and 4.0mm,respectively,which can meet the precipitation inversion applied in Fangshan area.2.Using the observation data of August 2017 from the China mainland tectonic environmental monitoring network and the original sounding data in the same time period,experiments of precipitation inversion were carried out,and the performance of GPS inversion of water vapor was verified by comparison.The results show that the average deviation of the GPS invertible precipitation of the site where the experiment is conducted reaches 3mm.This accuracy meets the needs of the field of meteorology.It proves that the GPS technology can be used as an independent to provide high time resolution for applications such as numerical weather forecasting.High-precision ZTD/PWV product technology.Also taking the August 2017 land-state network data as an example,based on China's 6 sites located in the east,west,south,north and center,GNSS multi-system precise single-point positioning estimation of precipitation is conducted.Five of the experiments.The precipitable amount of the station is better than that estimated by the single system,and is closer to the precipitable amount obtained by the original integral.The average deviation decreases by 30% on average,and the root mean square error decreases by 35%.3.Based on the tropospheric delay obtained from sounding data,an atmosphereenhanced precision single-point positioning experiment was conducted,which mainly compared the convergence speed and accuracy of the zenith direction.The experimental results found that the precision single-point positioning effect with the addition of atmospheric delay constraints compared to.In terms of model empirical results,the convergence speed is faster and the stability is better.