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    • 10. 发明申请
    • Method for Real-time, Automatic, Wideband, High Accuracy RF Direction Finding
    • 实时,自动,宽带,高精度RF方向寻找方法
    • US20140104110A1
    • 2014-04-17
    • US13653476
    • 2012-10-17
    • Lars Karlsson
    • Lars Karlsson
    • G01S3/02
    • G01S3/74
    • This system and method provides a direction finding system that enables modern RF DF systems to analyze short duration signals in the entire instantaneous bandwidth. By providing a method to process wideband data, the invention drastically improves throughput and probability of intercept (POI). The invention is unique in that it does not require separate narrowband channels for analysis, and can simultaneously calculate azimuth and elevation estimates for every frequency in the bandwidth of an incident signal. It is also well-suited for fixed point, FPGA implementations making it a perfect match for modern state-of-the-art processing systems. The system and method capitalizes on the ability of Fourier Frequency Transform operations to accurately resolve incident wave phase at discrete frequencies. The system then uses the phase information from the individual elements in the array to arrive at an emitter azimuth angle. The azimuth angle is nearly simultaneously used in concert with lookup tables of all possible elevation angles to compare the arrival time delay between the array elements to determine emitter elevation angle.
    • 该系统和方法提供了一种方向发现系统,其使得现代RF DF系统能够在整个瞬时带宽中分析短持续时间信号。 通过提供处理宽带数据的方法,本发明大大提高了吞吐量和拦截概率(POI)。 本发明是独特的,因为它不需要单独的窄带信道用于分析,并且可以同时计算入射信号带宽中每个频率的方位角和高程估计。 它也非常适合固定点,FPGA实现使其成为现代最先进的处理系统的完美匹配。 该系统和方法利用傅里叶频率变换操作精确地解决离散频率入射波相位的能力。 然后,系统使用来自阵列中的各个元件的相位信息来达到发射器方位角。 方位角几乎同时用于所有可能仰角的查找表,以比较阵列元件之间的到达时间延迟,以确定发射器仰角。