Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-05-25
1979-03-06
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325304, 325363, 343112R, H04B 116
Patent
active
041433211
ABSTRACT:
Signals in the form of pulses generated by a plurality of signal sources are received at two spaced receivers, and following initial filtering (if any), are stored, in chronological order of receipt, in memories associated with each receiver. Each pulse so stored has associated therewith time data which is the time of its arrival at the receiver. The difference between the time data of the first pulse stored in the first memory and the time data of each, or selected ones, of the pulses in turn in the second memory is determined, and then compared with a preselected range of time data. A preselected numerical quantity is then added to a specific address location in an accumulator whenever the time difference satisfies the preselected range. Each satisfactory time difference has a unique address location in the accumulator. The above steps are then repeated for each singal in the first memory. An accumulated total numerical quantity is thus present in the accumulator for each satisfactory time difference following conclusion of the above steps. The above process steps are then repeated, except that instead of adding a numerical quantity of the accumulator each time a successful time difference is determined, the accumulator is interrogated to determine whether that particular address location has accumulated a total numerical quantity which is above a preset threshold level. If so, the two pulses from the memories being compared at that point are read out of the memories into a follow-on storage device, where they are further stored in order of time difference.
REFERENCES:
patent: 3659085 (1972-04-01), Potter et al.
patent: 3705404 (1972-12-01), Chisholm
patent: 3714573 (1973-01-01), Grossman
patent: 3848254 (1974-11-01), Drebinger
patent: 3881154 (1975-04-01), Lewis et al.
patent: 3940700 (1976-02-01), Fischer
Chin Tommy P.
Griffin Robert L.
The Boeing Co.
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