【摘要】：對流層延遲是衛(wèi)星導(dǎo)航定位的主要誤差源,GNSS廣域增強需要高精度的對流層延遲產(chǎn)品進(jìn)行誤差修正。對流層延遲可通過GNSS進(jìn)行實時估計,也可通過融合多源數(shù)據(jù)的數(shù)值氣象預(yù)報模型獲取。IGS發(fā)布的全球?qū)α鲗犹祉斞舆t產(chǎn)品由GNSS解算,其精度可達(dá)4mm,時間分辨率為5min,但其分布不均勻,在廣袤的海洋區(qū)域無數(shù)據(jù)覆蓋。GGOS Atmosphere基于ECMWF 40年再分析資料,可提供1979年以來時間分辨率為6h、空間分辨率為2.5°×2°的全球天頂對流層總延遲格網(wǎng)數(shù)據(jù)。本文通過2015年全球IGS測站的ZTD資料對GGOS的ZTD產(chǎn)品進(jìn)行了評估,研究了GGOS Atmosphere對流層延遲產(chǎn)品與IGS發(fā)布ZTD資料之間的系統(tǒng)差,通過線性擬合估計出每個測站GGOS-ZTD與IGSZTD系統(tǒng)差系數(shù)(包括比例誤差a和固定誤差b),然后對比例誤差a、固定誤差b進(jìn)行球諧展開,建立了兩種ZTD數(shù)據(jù)源之間的系統(tǒng)差模型。選取IGS測站和陸態(tài)網(wǎng)測站,對附加系統(tǒng)偏差改正后的GGOSZTD產(chǎn)品對PPP的收斂速度的影響進(jìn)行研究。本文研究結(jié)果表明:GGOS-ZTD與IGS-ZTD間存在系統(tǒng)偏差,其bias平均為-0.54cm;兩者之間較差的RMS平均為1.31cm,說明GGOS-ZTD產(chǎn)品足以滿足廣大GNSS導(dǎo)航定位用戶對對流層延遲改正的需要。將改正了系統(tǒng)差后的GGOS-ZTD產(chǎn)品用于ALBH、DEAR、ISPA測站、PALM測站、ADIS測站、YNMH測站、WUHN測站進(jìn)行PPP試驗,發(fā)現(xiàn)可明顯提高定位收斂速度,尤其是在U方向上,收斂速度分別提高10.58%、31.68%、15.96%、43.89%、51.46%、14.69%、18.40%。
[Abstract]:Tropospheric delay is the main error source for satellite navigation and positioning. GNSS wide area enhancement requires high accuracy tropospheric delay products for error correction. The tropospheric delay can be estimated in real time by GNSS, and the global tropospheric zenith delay product released by GNSS can also be obtained by using the numerical weather forecast model with multi-source data, and the global tropospheric zenith delay product can be calculated by GNSS. Its accuracy can reach 4 mm, time resolution is 5 min, but its distribution is uneven. There is no data coverage. GGOS Atmosphere is based on ECMWF 40 years reanalysis data. The global zenith tropospheric total delay grid data with a temporal resolution of 6 h and a spatial resolution of 2.5 擄脳 2 擄since 1979 can be provided. Based on the ZTD data of global IGS station in 2015, this paper evaluates the ZTD products of GGOS, and studies the system difference between GGOS Atmosphere tropospheric delay products and ZTD data released by IGS. The differential coefficients of GGOS-ZTD and IGSZTD system (including proportional error a and fixed error b),) are estimated by linear fitting. Then the spherical harmonic expansion of proportional error a and fixed error b is carried out, and the system difference model between two kinds of ZTD data sources is established. IGS stations and land-based network stations are selected to study the effect of the GGOSZTD product after the correction of the additional system deviation on the convergence rate of the PPP. The results show that there is a systematic deviation between IGS-ZTD and GGOS-ZTD, the average bias is -0.54 cm, and the average RMS between the two is 1.31 cm, which indicates that the GGOS-ZTD product can meet the needs of GNSS navigation users for tropospheric delay correction. The GGOS-ZTD product, which has been corrected, is used in the PPP test of the pan station and the YNMH station. It is found that the convergence rate of the positioning can be improved obviously, especially in the U direction, and the convergence rate is increased by 10.58%, 31.68%, 43.89%, 51.46%, 14.69% and 18.40%, respectively, in the direction of U, and the following results are obtained: (1) in the direction of U, the speed of convergence is 10.58%, especially in the direction of U, the convergent speed is increased by 10.58% and 31.68%, respectively, and the speed of convergence is increased by 51.46% and 14.69%.
【作者單位】： 武漢大學(xué)測繪學(xué)院;
【分類號】：P228.4

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