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1、CorrectionMethodofPseudorangeMeasurementandObservationTimeinRocketOnboardGPSReceiverRAOAi-shui,LiuBing,HuJian,WangZhen-ping,ZhangLongAbstract:ThepseudorangemeasuringdatareservesonlythefractionpartofGPSsignalsendingtime,whichisdownto
thegroundfromtherocketonboardreceiver,the
2、reisanintegersecondambiguityproblemwhencalculatingpseudorange.The
pseudorangemeasuringtimeupdatesasthefrequencyof2Hz,whichissmallerthanthepseudorangesamplingfrequencyof
10Hz,thereistwoproblemwhenusingleastsquaremethodtocalculatethepositionandvelocityofrocket,firstlyposition
3、ing
precisionisbecomingworse,secondlyobservationtimeis100msambiguity.Basdonanalysingthelocationincarrierrocket,
GPSsatelliteandtheEarth,pseudorangetheoriesvalueiscalculatdwhoischangingwithrocketflightheight.Accordingto
thedifferentcharacteristicofpseudorangetheoriesvalue,th
4、eflightdistrictofcarrierrocketisdividedtofourdistricts.Some
real-timecorrectingalgorithmonpseudorangemeasurementandobservationtimeispresentedbydifference
district.Somerocketflytrialdataisusedtotestthecorrectingalgorithm,resultshowsthatthealgorithmcansolve
theintegersecondam
5、biguityproblem,100msambiguityproblem,pseudorangemeasurementandobservationtimenotmatch
problem.Thepositioningprecisionismeetrocketflytrialdemand.Keywords:GPSreceiver;pseudorangemeasurement;carrierrocket;real-timecorrecting;academicpseudorange;箭载GP(S中国接饶卫收星爱机海水上，伪测刘距控冰观部，胡技测术
6、健量,部王及振观平，测张时龙间修正方法·江苏江阴·214431)2Hz10Hz100msGPS100ms0引言GPStsvTable1.pseudorangemeasurementdataofsomereceiver1.tkstsvs317179.188355.552734380.086369064317179.1190653.734375000.186367287317179.1292951.916015630.286365509317179.1395250.096679690.386363731317179.1497548.2773437
7、50.486361952317179.1599846.456054690.586360172317179.1702144.635742190.686358393317179.1804442.813476560.786356611317179.1906740.991210940.88635483317179.11009039.168945310.9863530491原始测量数据分析tsvt）chipρ=(tk−sv)⋅tctsv=(tk((tk)intρ=−(−t)(t))⋅csvintsvdec−(t)+−(t))(t)⋅csvintkdec
8、svdec(tsvtsv)int
9、(tk)int−(tsv)int
10、<=1(tsv)dectsvfc=1.023×10bpstsv=tchip/fc6(tsv0)i
