一种高可靠GNSS接收机位同步算法

位同步技术是GNSS接收机技术的重要组成部分,位同步错误会导致接收机伪距解算错误及无法正确解调电文。针对弹载GNSS接收机的高可靠性要求,提出了一种高可靠GNSS接收机位同步算法,对最大似然位同步算法进行了改进。在非相干积分过程中等间隔提取中间结果进行观测,综合多次观测结果和最终非相干积分结果进行位同步判断。数值仿真与分析表明,在弱信号情况下,在不增加估计时间的前提下,可以大幅度减小错误同步概率,对于提高弹载GNSS接收机可靠性有着重要意义。

A High Reliability Bit Synchronization Algorithm for GNSS Receivers

Bit synchronization algorithm is an important part of GNSS receiver. If the result of bit synchronization method is wrong, the receiver will obtain wrong pseudo range and cannot obtain navigation data. A high reliability bit synchronization algorithm for GNSS receiver is proposed to improve the robust- ness of GNSS receivers on missile, which improves the conventional maximum likelihood method. The new approach extracts integral results evenly, and uses the intermediate results and the last result to judge the beginning of the navigation data. Numerical simulations show that the new approach can decrease the error rate for weak GNSS signals and does not increase estimate time, which is very meaningful for im- prove the reliability of GNSS receivers on missile.