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Patent
CA 1099004
T I T L E RADAR ALTIMETER FOR TROPICAL AREAS I N V E N T O R Ray L. Westby ABSTRACT OF THE DISCLOSURE A radar altimeter system for measuring, from an aircraft flying above tropical forest areas, the height of the ground and the height of the forest canopy above the ground comprising a transmitter, a receiver for detecting return pulses from the ground and forest canopy, timing means for measuring the time of arrival at the beginning and end of each received pulse and averaging the said times, means for examining the received pulse duration and preventing pulses with a shorter time duration than a predetermined time from passing further in the system, and means for examining a selected number of pulses and coupling the voltage derived from the received pulse having the longest time of arrival to an output to give an indication of the ground level and the voltage derived from the received pulse having the shortest time of arrival to an output to give an indication of the forest canopy level.
317905
Hughes James R.
Westby Ray L.
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