【摘要】：電離層時延誤差是導(dǎo)航定位信號在空間傳播路徑上的主要誤差源之一,因此全面了解GNSS電離層模型的改正精度具有一定現(xiàn)實意義.根據(jù)GPS,BDS和Galileo系統(tǒng)所采用的電離層修正模型,利用2014年電離層校正參數(shù),以高精度全球電離層圖為基準,評估分析了三大系統(tǒng)電離層時延的改正精度.結(jié)果表明:目前GNSS使用的幾種電離層修正模型的改正率在65%~75%左右;Galileo系統(tǒng)使用的第二版NeQuick模型與第一版NeQuick模型相比在修正精度上并無顯著提高;GPS使用的Klobuchar 8參數(shù)模型在北半球25°一45°N的中緯度地區(qū)精度很高,但是在全球其他區(qū)域精度較低,分布性較差,而NeQuick模型全球改正率分布則較為平均且平滑.
[Abstract]:Ionospheric delay error is one of the main error sources of navigation and positioning signal in space propagation path, so it is of practical significance to fully understand the correction accuracy of GNSS ionospheric model. According to the ionospheric correction model adopted by GPS,BDS and Galileo systems, the correction accuracy of ionospheric delay of three systems is evaluated and analyzed by using the ionospheric correction parameters in 2014 and using the high-precision global ionospheric map as the benchmark. The results show that the correction rates of several ionospheric correction models used by GNSS are about 65% / 75%, and the correction accuracy of the second edition of NeQuick model used by Galileo system is not significantly higher than that of the first version of NeQuick model. The accuracy of the Klobuchar 8 parameter model used by GPS is very high in the mid latitude region of 25 擄- 45 擄N in the Northern Hemisphere, but in other regions of the world the accuracy is lower and the distribution is poor, while the global correction rate distribution of the NeQuick model is more average and smooth.
【作者單位】： 解放軍信息工程大學(xué)導(dǎo)航與空天目標工程學(xué)院;西安測繪研究所;
【分類號】：P228.4;P352

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