Communications: directive radio wave systems and devices (e.g. – Determining distance – Triangulation
Reexamination Certificate
2007-04-17
2007-04-17
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Triangulation
C342S059000, C342S118000, C342S120000, C342S175000, C342S195000, C342S450000, C342S451000, C342S463000, C342S464000, C342S465000
Reexamination Certificate
active
11144133
ABSTRACT:
A multistatic radar has a radar transmitter for illuminating a target with a radar signal. The target reflects the radar signal to three separate radar receivers, each performing a bistatic range measurement to the target. The three bistatic range measurements are combined in a quadratic equation having two solutions (roots). One solution (root) corresponds to a correct three dimensional target position with respect to the radar transmitter while the other is an incorrect three dimensional target position with respect to the radar transmitter. The incorrect three dimensional target position is identified and eliminated by comparing the three dimensional target position to the transmitter location, and the receiver locations. The incorrect three dimensional target position is also identified by the target altitude exceeding a threshold, typically set above 80,000 feet AGL.
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Chalmers Gordon R.
Ho Shu K.
Alkov Leonard A.
Gregory Bernarr E.
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