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1.5 Direction Finding (DF) and Emitter Location 测向与定位
Of special importance to operational ELINT (OPELINT) is the location of emitters. This is usually approached by means of angle-of-arrival (AOA) measurements for coarse location and also for pulse sorting. More precise location makes use of precise time of arrival (TOA) and frequency of arrival (FOA) measurements at multiple platforms. These aspects are discussed in detail in Chapters 5 and 6.
这里所讨论的测向与定位是被动的或无源的,即测向(定位)设备本身不辐射电磁波,通过接收外部辐射信号工作。最简单的定位方法是几何法,根据两台或两台以上的测向设备同时获取的角度计算出相应目标的位置,但这种方法的定位精度低,一般用于粗略测量。精确定位的方法包括时差和频差测量法等,精度提高的代价是设备和算法复杂程度的增加。
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