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先前技术讨论以前的技术中有几种测向和频率识别方法。其中最著名的大概就是标准外差技术。此技术就是将外差接收机调谐为峰值输出,提供疑问频率的读数。可利用高定向天线完
Prior Art Discussions There are several methods for direction finding and frequency identification in prior art. One of the most famous is probably standard heterodyne technology. The technique is to tune the heterodyne receiver to peak output to provide a skew frequency reading. Highly directional antenna available