PAN Shu1,2，HUA Yu1

(1. National Time Service Center, Chinese Academy of Sciences, Xi’an, Shaanxi 710600, China;

2. GraduateUniversity of Chinese Academy of Sciences, Beijing 100039, China)

Abstract：In order to investigate and reduce the effects of multipath errors on the satellite navigation receiver, an analysis for code phase and carrier phase multipath errors is given in theory and some simulation made with Matlab are completed, laying a foundation to further reduce the multipath errors.

Key words：multipath；PLL；GPS