Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1972-12-13
1976-06-22
Tubbesing, T.H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 7PF, 340258B, G01S 902
Patent
active
039654702
ABSTRACT:
Threshold count pulses, the number of which being proportional to the slope of an impedance curve of a radiating antenna in an RF detection system, are counted in a first counter and, upon receipt of a read pulse representing a threshold of impedance, are transferred to a memory counter while the read pulse delayed resets the first counter. The values in these two counters are compared in a first comparator which emits a pulse if the value of the first counter is greater than that of the memory counter and in the absence of these pulses a sequencer emits a signal indicating a target is moving outwardly. The threshold count pulses also feed an AND gate together with pulses from the first comparator with the AND gate output being fed to a third counter. The third counter is compared in a second comparator which emits a pulse upon equality indicating the target has approached an inner boundary. The third counter is reset with delayed read pulses.
REFERENCES:
patent: 3717864 (1973-02-01), Cook et al.
patent: 3727216 (1973-04-01), Antonio
patent: 3731305 (1973-05-01), Gehman
Clinard Glenn G.
Guth Kenneth C.
Mulhollam Gail R.
Volk Frank J.
Rusz Joseph E.
Siegel Julian L.
The United States of America as represented by the Secretary of
Tubbesing T.H.
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