【作者】 吴超； 许录平； 张华；

【Author】 Chao Wu 1 , Lu-ping Xu 2 , Hua Zhang 2 1School of Space Science and Technology, Xidian University, Xi’an China 2School of Space Science and Technology, Xidian University, Xi’an China

【机构】 空间科学与技术学院,西安电子科技大学；

【摘要】 为了提高卫星信号的捕获概率,本文提出一种基于频域滤波的码捕获方法,由于经过匹配滤波后的信号具有低频率窄带宽的特点,所以该方法对经过匹配滤波后的时域信号进行频域滤波处理,滤除了大量的噪声能量而保留大部分有用信号的能量,并且此方法根据滤波后的信号建立了统计变量,然后对建立的统计变量进行基于能量的检测。最后实验仿真分析表明此方法可以有效地提高检测概率。更多还原

【Abstract】 In order to improve the acquisition probability of satellite navigation signal, this paper proposes a new code acquisition method based on frequency domain filtering. Due to low frequency and narrow bandwidth of the time-domain related signal that we obtain by a set of partial matched filters (PMFs), which the normal methods don’t consider, we could perform low-pass filtering with almost no losses of signal energy and filtering out some noise. Then we create the statistic variable after frequency domain filtering, and energy detection is made. The theoretical analysis and simulation results show that the method can effectively improves the detection probability更多还原