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In page TERCOM:
"As a radar altimeter measures the distance between the missile and the terrain, not the absolute altitude, the important measure in the data is the change in altitude from square to square. The missile's radar altimeter feeds measurements into a small buffer which periodically "gates" the measurements over a period of time and averages them out to produce a single measurement. The series of such numbers held in the buffer produce a strip of measurements similar to those held in the maps. The series of changes in the buffer is then compared with the values in the map, looking for areas where the changes in altitude are identical. This produces a location and direction. The guidance system can then use this information to correct the flight path of the missile.
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