卫星信号发射时刻的无偏恢复

卫星信号发射时刻在导航定位中是一个重要的参数,但是在城市峡谷等弱信号条件下,接收机可能完成不了所有卫星信号发射时刻的组装。在伪距定位中卫星信号发射时刻的组装和粗时段导航中卫星信号发射时刻的恢复(有偏)技术基础上,提出一种无偏的卫星信号发射时刻恢复方法,前提是卫星至少能完成一颗星的伪距测量,并且具有150km误差范围内的先验位置和辅助星历。利用BDS B1和GPS L1中频数据在软件接收机平台进行了BDS,GPS信号发射时刻无偏恢复验证实验证明了方法的有效性。

Unbiased recovery of satellite signal transmit time

T he satellite signal transmit time is an important parameter in navigation and positioning .But in urban canyons and other weak signal conditions , the receiver may not finish assembly for all satellite signals transmit time .In the base of the signal transmit time assembly method in pseudorange positioning and the signal transmit time recovery technology in coarse time navigation ,this paper proposes an unbiased satellite signal transmit time recovery method w hich is effective if one pseudorange can be measured ,and the error of priori position is within 150 km and assisted ephemeris is available .BDS and GPS signal transmit time recovery experiment have been producted in software receiver platform with BDS B 1 and GPS L1 intermediate frequency data ,w hich proves that this method is effective .