Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-03-30
1983-11-29
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343454, G01S 1380, G01S 1391
Patent
active
044183496
ABSTRACT:
Located adjacent to runways, taxiways, and approach ramps are secondary radar interrogators which radiate the P1 and P3 pulses and the P2 pulse via different directional patterns into sectors to be monitored which are individually assigned to each interrogator. Direction finders at different locations determine the directions of arrival of SSR reply signals radiated by an airborne SSR transponder in a sector to be monitored. From the directions of arrival and the locations of the direction finders, the respective transponder position is determined. The interrogators require no central control. Alternatively, the arrival times of the SSR reply signals are measured at several points; an evaluating device forms the differences in arrival time, and the intersection of the hyperbolic lines of position determined in the evaluating device is the position of the transponder.
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Aviation Week & Space Technology, Jun. 28, 1976, pp. 67, 70-73, AGARD Conf. Proc. No. 188 21-12.
Cohrs Heinz L.
Hofgen Gunter
Burk Robert C.
International Standard Electric Corporation
Kristofferson T. E.
O'Neil W. T.
Wilbur Maynard R.
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