GNSS接收机伪距测量对定位的影响

伪距测量是全球卫星导航系统（GNSS）与其它无线通信系统一大显著区别之一。在卫星导航定位系统中，必须通过PRN码测出用户接收机到各颗卫星的距离，才能定位。卫星钟差、用户钟差、多普勒效应、电离层延迟、对流层延迟等，都使测距产生一定的误差，所以称为伪距。伪距测量的精度，直接影响到定位的精度。为定量分析伪距测量对定位结果的影响，本文给出选择不同星的伪距和同一伪距不同误差情况下对最终定位结果的影响，为接收机的研发提供重要的参考。

The Affection of Pseudorange on PVT in GNSS Receiver

The measurement of pseudorange is some a big difference between GNSS and other wireless communication systems. In satellite navigation systems, PVT is impossible unless the pseudorange between user receiver and satellites is measured by PRN cede. Because of satellite clock error, receiver clock error, Doppler,ionospheric delay, tropospheric delay etc, pseudorange is not exactly the real distance. The precision of pseudorange decides that of PVT. In order to analyze the affection of pseduorange on PVT quantificationally, this paper gives the result of pseudorange selection and pseudorange error. It is a good reference of GNSS research and development.