The GMTI idea
Ground or surface moving target detection (often called ground moving target indication or GMTI) consists of radar or EO detection of humans or tactical vehicles moving on or near the earth's surface. Animals and humans have little difficulty detecting movement and sorting unimportant movements from an important movement at short range. This is the result of hundreds of millions of years of selective evolution. For example, the frog's eye is especially adapted to detect and react to a fly-sized object moving through its field of vision. It is so good that its tongue is on the move to where the fly will be (not where it is) in less than 100 ms. Sadly, radars and EO sensors are not nearly that good over their ranges of operation (much longer than a frog's tongue!). In the following sections, the fundamental characteristics for discrimination of ground mover RCS, Doppler signature and clutter will be discussed.
The GMTI idea, Page 1 of 2
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