Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Iff or sif
Patent
1992-06-30
1994-01-18
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Iff or sif
342 55, G01S 1378, G01S 1380
Patent
active
052802876
ABSTRACT:
An Identification Friend or Foe (IFF) method and system are provided to dct i) friendly ground-based vehicles, ii) each of the vehicle's unique identity, and iii) each of the vehicle's approximate position. A video image of an area of interest on the ground is generated from an aircraft. The video image is defined by a matrix of pixels. A range from the aircraft to a reference position within the area of interest is provided. The reference position is defined by known latitude, longitude and height within the area of interest and is further defined in the matrix of pixels by matrix coordinates. A coded signal is transmitted from a vehicle on the ground to uniquely identify the vehicle and identify the vehicle as friendly. The coded signal is also detectable as part of the video image when the coded signal is transmitted from the area of interest. The vehicle position within the area of interest is thus defined in the matrix of pixels by matrix coordinates. Using image processing techniques, offset distances between the reference position defined by matrix coordinates and the vehicle position defined by matrix coordinates are determined. The range to the reference position and the determined offset distances are indicative of the vehicle's latitude, longitude and height within the area of interest.
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Lewis John D.
Shuster Jacob
Sotomayor John B.
The United States of America as represented by the Secretary of
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