关键词: 北斗卫星, 差分播发, 远距离, 海洋工程, 高精度定位

Abstract: With the development of long distance ocean engineering project, high precision positioning of BeiDou satellite is greatly needed, the conventional ground based augmentation system and differential transmission can not be implemented in far away sea area. To solve the problem of BeiDou high precision positioning, BeiDou satellite system with short message function is used to broadcast precise point positioning error correction. By sending the observed correction of satellite clock error and ephemeris error of high precision to BeiDou satellite terminal, the remote transmission of the BeiDou satellite correction information is realized, the transmission distance is greatly expanded, no longer subject to geographical restrictions. The positioning accuracy of the BeiDou system is greatly improved, and the application of BeiDou technology in ocean engineering is expanded.

Key words: BeiDou satellites, differential broadcast, long distance, ocean engineering, high precision positioning