本文選題：全球電離層模型 + GIM約束　； 參考：《大地測量與地球動力學》2017年01期

【摘要】：針對目前地基GNSS臺站在全球分布不均勻,導致南半球海洋和中高緯地區(qū)出現(xiàn)與實際不符的VTEC為負值的問題,利用IGS前1d的最終GIM作為虛擬觀測值對TEC可能為負值的地區(qū)進行約束,結(jié)合GNSS數(shù)據(jù)建立全球電離層模型(稱為SGG模型),并用2014年200多個IGS臺站數(shù)據(jù)對模型進行驗證。結(jié)果表明,各臺站VTEC的RMS優(yōu)于3TECu(赤道異常區(qū)域RMS在5~7TECu)。同時SGG能有效消除南半球海洋(40°~90°S)VTEC為負的情況,且對原有非負VTEC幾乎沒有影響(其變化小于2TECu)。SGG的衛(wèi)星DCB與CODE相比,RMS和MEAN分別優(yōu)于0.2ns和0.04ns,不同緯度帶SGG與CODE的接收機DCB估值變化基本一致,兩者之差基本在1ns以內(nèi)。
[Abstract]:In view of the uneven distribution of the ground based GNSS stations in the world at present, there is a negative value of VTEC in the Southern Hemisphere ocean and in the middle and high latitudes, which is not in accordance with the actual conditions. The final GIM of the first day of IGS is used as the virtual observation value to constrain the region where TEC may be negative. The global ionospheric model (called SGG model) is established with GNSS data, and the model is verified by more than 200 IGS station data in 2014. The results show that the RMS of VTEC is better than that of 3TECu. At the same time, SGG can effectively eliminate the negative VTEC in the Southern Hemisphere ocean, which is 40 擄~ 90 擄Schion. Moreover, there is little effect on the original non-negative VTEC (its variation is less than 2TECu.SGG). Compared with code, DCB and Mean are superior to 0.2ns and 0.04ns, respectively. The estimation changes of the receivers with different latitudes are basically the same, and the difference between them is basically within 1ns.
【作者單位】： 武漢大學測繪學院;中國南極測繪研究中心;
【基金】：國家自然科學基金(41574028) 湖北省杰出青年科學基金(2015CFA036)~~
【分類號】：P228.4

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本文編號：1994262