一种适用于微弱信号的新颖双峰值比率捕获策略

Novel double-peak-value ratio acquisition strategy for weak signal

为了提高全球导航系统定位系统的捕获灵敏度,对全球定位系统的捕获策略进行了深入研究。基于对传统双峰值比率捕获系统的分析,提出了一种新颖的GPS双峰值捕获策略。该新颖的捕获策略通过结合相干积分和唐检测算法的思想,将多个毫秒的导航数据累加来提高检测概率,利用多个比值进行多次捕获确认来提高捕获灵敏度,并运用蒙特卡洛方法进行了仿真分析。仿真结果表明:该新颖策略的捕获灵敏度比传统的双峰值比率捕获系统要高6 d B。总体来说,该新颖策略算法更适用于对GPS的弱信号捕获,也可应用于其他卫星导航系统。

In order to improve the acquisition sensitivity of global navigation satellite system (GNSS), the acquisition strategy of GPS system is studied. A novel GPS double-peak-value ratio acquisition strategy is proposed by analyzing traditional double-peak-value ratio acquisition system. This novel acquisition strategy is based on the thought of combining coherent integration with Tang detection algorithm. The detection probability is improved by accumulating several milliseconds of navigation data, and the acquisition sensitivity is improved by using multiple ratios to implement multiple acquisition confirmations. Furthermore, the simulation analysis is performed by applying Monte-Carlo Method, and the results show that the novel strategy acquisition sensitivity is 6 dB higher than that of traditional double-peak-value ratio acquisition system. In general, the proposed strategy algorithm is more suitable for GPS weak signal acquisition and can also be applied in other satellite navigation systems. ©, 2015, Editorial Department of Journal of Chinese Inertial Technology. All right reserved.