改进的GNSS信号快速捕获检测算法

Improved algorithm for rapid detection in GNSS signal acquisition

为了满足卫星导航接收机在高动态应用场景中对卫星信号快速捕获的需求,本文针对全球导航卫星系统(global navigation satellite system,GNSS)信号的捕获检测问题提出了一种改进的检测算法。该算法结合了N中取M检测算法和唐检测算法的优点,考虑信号存在和不存在时的两种情况,通过设置多级门限检测机制,加快了信号存在时的检测确认速度和信号不存在时的剔除速度。实际数据测试表明,改进算法在检测概率没有任何损失的情况下,捕获检测速度相对于N中取M算法提高3倍,相对于唐检测算法提高1/3。

To ensure fast acquisition of satellite signals in high dynamic applications, an improved algorithm was proposed for signal detection during acquisition by global navigation satellite system. The algorithm combined the advantages of the M-of-N and Tong detection algorithms. Through the multi-threshold detection mechanism, the detection and rejection speed accelerated whether the signals exist or not. Numerous real data tests show that the im- proved algorithm is three times faster than the M-of-N detection algorithm and one-third times faster than the Tong detection algorithm without any performance deterioration.