資源描述:
《GPS接收機(jī)定位解算算法.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、GPS接收機(jī)定位解算算法Page1of14RevisionHistoryVersionDateAuthorDescriptionPage2of14AbbreviationGPSGlobalPositionSystemECEFEarthCenterEarthFixPage3of14Directory1引言...................................................................................................................................52GPS定位原
2、理...................................................................................................................63GPS衛(wèi)星系統(tǒng)...................................................................................................................73.1GPS衛(wèi)星位置計(jì)算......................................
3、.............................................................73.1.1衛(wèi)星位置、速度計(jì)算.......................................................................................73.1.2衛(wèi)星仰角、方位角計(jì)算...................................................................................93.2GPS衛(wèi)星Doppler頻移估算.........
4、.............................................................................94接收機(jī)計(jì)算.....................................................................................................................114.1定位方程解算...............................................................................
5、..........................114.1.1參與定位衛(wèi)星數(shù)為4.......................................................................................114.1.2參與定位衛(wèi)星數(shù)大于4...................................................................................124.2坐標(biāo)轉(zhuǎn)換.....................................................
6、............................................................134.3接收機(jī)速度計(jì)算.....................................................................................................14Page4of141引言本文主要對(duì)GPS接收機(jī)位置、速度計(jì)算方法進(jìn)行簡(jiǎn)單介紹。本文內(nèi)容包括:GPS定位原理,GPS衛(wèi)星位置、速度及Doppler頻移計(jì)算,接收機(jī)位置、速度計(jì)算。Page5of142GPS定位原理GPS系統(tǒng)假設(shè)地球球心
7、固定,采用以地球球心為原點(diǎn)的三維笛卡爾坐標(biāo)系——ECEF坐標(biāo)系。每顆GPS衛(wèi)星不斷向外廣播自身的精確位置信息——星歷信息。接收機(jī)接收到完整的星歷信息后,便可以計(jì)算出GPS衛(wèi)星在ECEF坐標(biāo)系中的準(zhǔn)確位置。接收機(jī)在ECEF坐標(biāo)系中的位置?xyz,,?是未知的;由于接收機(jī)與GPS系統(tǒng)的時(shí)鐘不uuu同步,因此又引入一個(gè)未知數(shù)b。當(dāng)接收機(jī)跟蹤上至少4顆GPS衛(wèi)星,并正確解調(diào)出導(dǎo)航bit,ut收齊星歷,計(jì)算出衛(wèi)星位置?xyz,,?便可以聯(lián)立4個(gè)兩點(diǎn)間距離方程,從而解算出接收機(jī)iii位置。??2??2??2??x?