Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1984-09-28
1986-11-04
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342430, 342450, 342465, G01S 302, G01S 502
Patent
active
046212671
ABSTRACT:
A passive system and related methods for detecting the location of a plurality of N targets by using two X-beam antenna systems and by (i) measuring the time delay between receipt of signals in the two planes of each X-beam which are received directly from the target and by (ii) measuring the time delay between the receipt of signals in the two planes of each X-beam which signals are emitted by the target but reflected from a remote surface. By known these two time delays for each antenna system, the heights of the antenna systems, the fixed angle between the two planes of the X-beam for each system, and the rate of rotation of the X-beam for each system, a direct calculation is established to determine the altitude of each target as viewed from each of the two antenna systems. Bearing or azimuth angles are determined for each target at each antenna system, and the actual N target locations of the N.sup.2 possible locations are determined by locating the intersection of lines defined by azimuth angles for which the associated target altitudes for both the antenna systems are equal.
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Blum Theodore M.
Issing Gregory C.
The Boeing Company
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