Accession Number : ADD014216

Title :   Radar Guidance System.

Descriptive Note : Patent, Filed 2 Mar 86, patented 6 Oct 87,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hilton, Richard D ; Coate, Godfrey T

Report Date : 06 Oct 1987

Pagination or Media Count : 19

Abstract : Improved radar guidance system for the navigation apparatus of an air craft as it flies over substantially flat terrain with random and different features. The system is generally made up of an airborne radar altimeter, a video signal processor and a master processor. The altimeter transmits a series of pulses at predetermined time intervals for impacting a plurality of spaced points along the aircraft ground track. The echo signal of each pulse impacted point processor divides the amplified signal into corresponding signals. A comparator of the signal processor transforms one of the divided signals into corresponding signals a constant output. A track and hold arrangement of the signal processor correlates the delayed leading edge of the comparator output with the other of the divided signals so as to determine a point of intersection there between. The intersection point is a quantitized value of the delay sample of a given echo signal that is indicative of the average weighted reflectivity value of the preselected annulus of one or more random and different features about a pulse-impacted track point. (RH)

Descriptors :   *NAVIGATION, *RADAR, *RADIO ALTIMETERS, *TRACKING, *VIDEO SIGNALS, AIRBORNE, AIRCRAFT, ALTIMETERS, AMPLIFICATION, ECHOES, GUIDANCE, OUTPUT, PROCESSING EQUIPMENT, PULSES, QUANTIZATION, REFLECTIVITY, SIGNAL PROCESSING, SIGNALS, TERRAIN, TIME INTERVALS, WEIGHTING FUNCTIONS

Subject Categories : Active & Passive Radar Detection & Equipment
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE