①(National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
摘要 基于无源相干定位技术的外辐射源雷达通过计算参考信号和回波信号的互模糊函数实现目标距离和速度的检测。然而互模糊函数直接计算时的计算量很大，难以满足实时性要求。针对这一问题，该文基于中国国家标准DTTB(Digital Television Terrestrial Broadcasting)信号，从互模糊函数时延遍历和多普勒频率遍历两类快速计算方法出发，提出首级使用矩形窗作为抽取滤波器的多级抽取方法。与直接计算和不进行抽取滤波的快速方法相比，该文方法计算量可分别降低3个数量级和1个数量级以上。该文进一步对比分析了信号长度不同时两类快速方法的计算量，为实际应用中计算方法的选择提供参考。
Abstract：By calculating the cross ambiguity function of the reference signal and the echo signal based on the passive coherent location technologies, passive radar detects the distance and speed of the target. However, it is difficult to meet real-time requirements when calculated the cross ambiguity function directly. To solve this problem, this paper proposes a method that uses the rectangular window as the first stage filter of a multi-stage decimation based on two types of fast calculation method: delay traverse and Doppler frequency traverse, which are based on Chinese National Standard Digital Television Terrestrial Broadcasting (DTTB) signal. Compared with the direct calculation and the non-decimation calculation method, the amount of the calculation can be reduced more than 3 orders and 1 order separately. This paper further analyses the variance of the calculation amount of the two types of fast calculation method when time accumulation is changing and provides a reference for the choice of calculation methods in practical applications.
2013, Vol. 35 
