简介:Theaimofthisinvestigationistostudyhowtouseagravimetric(quasi)geoidforlevellingbyGPSdatainanoptimalway.TheadventofprecisegeodeticGPShasmadetheuseofatechniquepossible,whichmightbecalledGPS-gravimetricgeoiddetermination.Inthisapproach,GPSheightsabovethereferenceellipsoidaredeterminedforpointswhoselevelled(orthometric)heightHisabovesealevelpeoplehavealreadysurveyed;forthesepoints,wethushavethevaluesofthegeoidundulationN.ThesevaluesarethenusedtoconstrainthegeoidundulationsN′obtainedfromthegravimetricsolution.
简介:摘要周跳(cycleclips)是在全球定位系统技术的载波相位测量中,由于卫星信号的失锁而导致的整周计数的跳变或中断。正确地探测并恢复周跳,是全球定位系统载波相位测量中非常重要且必须解决的问题之一。本文主要讨论的是Blewitt组合探测方法探测周跳,通过程序对数据处理,验证Blewitt组合探测方法可以探测小周跳和等距周跳。