Low-Altitude FM Altimeter

摘要

With the recent emphasis on aircraft navigation safety, effort has been directed toward developing an altimeter capable of providing adequate altitude information for blind landings. Application of fuzing principles invented at DOFL has led to a radio altimeter which accurately (5 percent) measures dis¬tances from 5 ft to several thousand.nThis altimeter has been designed to furnish the pilot altitude information accurate enough throughout flareout and landing to enable his to make a safe instrument landing.nThe altimeter has been tested with a moving corner-reflector target out to several hundred feet and flight tested in a helicopter to 1000 ft. with good results.