李銳

摘 要：隨著衛(wèi)星導(dǎo)航系統(tǒng)的不斷發(fā)展和完善，在定位精度提升的同時(shí)，對(duì)系統(tǒng)完好性的研究受到越來(lái)越多的關(guān)注。GPS現(xiàn)代化中的一個(gè)重要變化，就是將電文中的用戶距離精度（URA）定義為空間信號(hào)完好性監(jiān)測(cè)參數(shù)，并對(duì)其定義、精度、參數(shù)設(shè)置和使用方式進(jìn)行了變化。針對(duì)這些變化，利用IGS的GPS廣播和精密星歷，處理2001—2012年間的所有衛(wèi)星實(shí)測(cè)數(shù)據(jù)，分析星歷/星鐘誤差和用戶距離誤差（URE）的變化情況，利用“包絡(luò)”和空間誤差橢球的概念解釋了URA演化的原因。給出了用戶端使用URA進(jìn)行定位解算和水平保護(hù)級(jí)計(jì)算的過(guò)程，并分析了URA的這些變化對(duì)用戶端使用的影響。

關(guān)鍵詞：衛(wèi)星導(dǎo)航 完好性 空間信號(hào) GNSS Integrity SIS

Abstract：With the development of satellite navigation system，the positioning accuracy has been improved much and integrity performance is attracting more and more attention.An important change in GPS modernization is that it defines the message′s user range accuracy（URA） as the signal-in-space integrity monitoring parameters，with the change of its definition，precision，parameter settings and using method. In response to these changes，the IGS′s GPS broadcast and precise ephemeris are used to analyze.Ephemeris/satellite clock error and user range error（URE） of 2001—2012 are calculated to summarize the changing trend.The concept of"bound"and spatial error ellipsoid are both used to explain the reason of URA′s evolution.What′s more，with the introduction of algorithm of user′s position and horizontal protection level calculation，the analysis of URA changes influence on user are given.

Key Words：GNSS；Integrity；SIS

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