【摘要】 针对传统Tong检测算法检测时间长、漏警概率大的问题，提出将PMF+双门限Tong检测算法应用于北斗B1I信号的捕获中。首先，将射频前端模块处理得到的中频信号下变频至基带，对基带信号进行降速等预处理；然后，利用部分匹配滤波（PMF）算法计算相关值，通过PMF算法将数据信号分成几个均等片段，对每一段信号都分别计算相关值，会出现三组具有同相位的相关结果；最后，利用双门限Tong检测算法对PMF算法计算得到的相关结果检测，达到捕获B1I信号的目的。仿真结果表明，利用该算法捕获北斗B1I信号，有效提高了捕获时的检测概率并缩短了检测时间，提高了捕获B1I信号的速度。更多还原

【Abstract】 Aiming at the problems of long detection time and high probability of missed alarm of traditional Tong detection algorithm, PMF+double threshold Tong detection algorithm is proposed to be applied to the acquisition of Beidou B1I signal. First, the IF signal processed by the RF front-end module is down converted to baseband, and the baseband signal is preprocessed such as speed reduction; Then, the partial matched filter(PMF) algorithm is used to calculate the correlation value. The data signal is divided into several equal segments by the PMF algorithm. The correlation value is calculated for each segment of the signal, and three groups of correlation results with the same phase will appear; Finally, the dual threshold Tong detection algorithm is used to detect the correlation results calculated by the PMF algorithm to capture the B1I signal. The simulation results show that the algorithm can effectively improve the detection probability and reduce the detection time when capturing the Beidou B1I signal, and improve the speed of capturing the B1I signal.更多还原