The observed terrain elevation sequence is obtained from the barometer and the radar altimeter,but the low precision of the barometers limited their application on the aircrafts.

• 实时测量的高程序列由惯导的高度通道和雷达高度表获得,首先对实测的和从电子地图中获得的地形高程序列分别进行零均值化处理,然后再运用相关法进行匹配。