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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。
Bit synchronization technology is an important part of the GNSS receiver technology. Bit synchronization errors can result in erroneous receiver pseudorange resolution and incorrect demodulation of the message. Aiming at the requirement of high reliability of the missile-borne GNSS receiver, a highly reliable GNSS receiver bit synchronization algorithm is proposed and the maximum likelihood bit synchronization algorithm is improved. In the process of non-coherent integration, the intermediate results are extracted at equal intervals and the bit synchronization is judged by combining the results of multiple observations and the final non-coherent integration. Numerical simulation and analysis show that under the condition of weak signal, the error synchronization probability can be greatly reduced without increasing the estimation time, which is of great significance for improving the reliability of the missile-borne GNSS receiver.