Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Aircraft guidance
Patent
1986-03-02
1987-10-06
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Aircraft guidance
342120, 342189, 364423, 364456, G01S 1389
Patent
active
046986359
ABSTRACT:
Improved radar guidance system for the navigation apparatus of an aircraft s 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 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 therebetween. 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 a preselected annulus of one or more random and different features about a pulse-impacted track point. The master processor combines a series of delay samples into a sample data array and then compares the sample array with a series of data arrays of a stored data matrix at a given altitude of the aircraft for the purpose of determining the aircraft flight path. Depending on the requirements of the signal processor, a Doppler filter may be used.
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Coate Godfrey T.
Hilton Richard D.
Goshorn Elmer E.
Gregory Bernarr Earl
The United States of America as represented by the Secretary of
Townsend William C.
Tubbesing T. H.
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