本文關(guān)鍵詞：GIM和不同約束條件相結(jié)合的BDS差分碼偏差估計(jì)　出處：《測(cè)繪學(xué)報(bào)》2017年02期 　論文類型：期刊論文

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【摘要】：現(xiàn)階段BDS衛(wèi)星和地面跟蹤站數(shù)量較少,用BDS單系統(tǒng)獲取的DCB精度有限,針對(duì)此問題,本文基于CODE GIM,采用兩種不同的"零均值"基準(zhǔn)約束方案(分別稱為約束1和約束2),選取2015年(DOY002-090)MGEX的BDS數(shù)據(jù),求解BDS的DCB,并對(duì)其進(jìn)行精度評(píng)估。結(jié)果表明,兩種約束方案下,衛(wèi)星DCB差值整體趨勢(shì)一致,DCBC2I-C7I、DCBC2I-C6I的系統(tǒng)性偏差分別約為-3.3ns和1.2ns,接收機(jī)DCB的系統(tǒng)性偏差與衛(wèi)星DCB大小相同,符號(hào)相反。相對(duì)于約束1,施加約束2后,IGSO和MEO衛(wèi)星DCB估值更加穩(wěn)定(DCBC2I-C7ISTD最大改善21%,DCBC2I-C6ISTD最大改善13%),IGSO和MEO衛(wèi)星的穩(wěn)定性(分別在0.1ns和0.2ns左右)優(yōu)于GEO衛(wèi)星(0.150.32ns)。約束2的DCB估值效果不僅與CAS/DLR產(chǎn)品有較好的一致性(Bias:-0.40.2ns),而且顧及了BDS衛(wèi)星DCB間的穩(wěn)定性差異。兩種約束方案下,BDS接收機(jī)DCB的STD無明顯變化,說明約束的選擇對(duì)BDS接收機(jī)DCB的穩(wěn)定性無明顯影響。BDS接收機(jī)DCB穩(wěn)定性整體上優(yōu)于1ns,中高緯度區(qū)域較好(STD 0.4ns左右),低緯度區(qū)域稍差(STD 0.81ns)。
[Abstract]:At present, the number of BDS satellites and ground tracking stations is relatively small, and the precision of DCB obtained by BDS single system is limited. In order to solve this problem, this paper bases on CODE GIM. Using two different "zero mean" benchmark constraint schemes (called constraint 1 and constraint 2), the BDS data of MGEX on 2015 are selected. The results show that the overall trend of satellite DCB difference is consistent with that of DCBC2I-C7I. The systematic deviation of DCBC2I-C6I is about -3.3ns and 1.2ns, respectively. The systematic deviation of receiver DCB is the same as that of satellite DCB, and the symbol is opposite. After constraint 2, the estimation of IGSO and MEO satellite DCB is more stable than that of DCBC2I-C7ISTD. The maximum improvement of DCBC2I-C6ISTD is 13.1). The stability of IGSO and MEO satellites (about 0.1ns and 0.2ns respectively) is better than that of GEO satellites (0.150.32ns). The DCB valuation effect of constraint 2 is not only consistent with that of the CAS/DLR product (Bias: -0.40.2ns). The stability difference of BDS satellite DCB is taken into account, and there is no obvious change in STD of DCB receiver under two constrained schemes. It shows that the choice of constraints has no obvious effect on the stability of BDS receiver DCB. The overall stability of DCB receiver is better than that of 1ns, and the mid-high latitude region is better than that of BDS receiver DCB 0.4ns). The lower latitudes are slightly different from STD 0.81nsm.
【作者單位】： 武漢大學(xué)測(cè)繪學(xué)院;武漢大學(xué)地球空間環(huán)境與大地測(cè)量教育部重點(diǎn)實(shí)驗(yàn)室;地球空間信息技術(shù)協(xié)同創(chuàng)新中心;武漢大學(xué)中國(guó)南極測(cè)繪研究中心;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(2016YFB0501803) 國(guó)家自然科學(xué)基金(41574028) 湖北省杰出青年科學(xué)基金(2015CFA036)~~
【分類號(hào)】：P228.4;TN967.1
【正文快照】： 年(DOY002-090)MGEX的BDS數(shù)據(jù),求解BDS的DCB,并對(duì)其進(jìn)行精度評(píng)估。結(jié)果表明,兩種約束方案下,衛(wèi)星DCB差值整體趨勢(shì)一致,DCBC2I-C7I、DCBC2I-C6I的系統(tǒng)性偏差分別約為-3.3ns和1.2ns,接收機(jī)DCB的系統(tǒng)性偏差與衛(wèi)星DCB大小相同,符號(hào)相反。相對(duì)于約束1,施加約束2后,IGSO和MEO衛(wèi)星DCB，

本文編號(hào)：1407960