According to the characteristic of Beidou double-star positing system(double-star positoin), this paper puts forward the optimal predication model of double-star position/SINS integrated system.
根据北斗双星定位系统（简称双星定位）的特点，提出了北斗双星与SINS组合的最优预测模型。
The position principle of Double star position system is introduced, and its shortcoming that is the bad real time of position is explained.
介绍了双星定位系统的定位原理，说明了其存在的定位实时性较差的不足。
Double star position system is one kind of regional position system build up.
双星定位系统是一种区域性定位系统。
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