Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-08-27
1977-08-02
Buczinski, S.C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 73, G01S 902
Patent
active
040400549
ABSTRACT:
Tracking apparatus which includes a plurality of trackers and a single track loop for tracking a plurality of radar threats or threat signals on a time-shared or time-multiplexed basis. The trackers cooperate with a receiver and a processor which processes the received threats deriving for each threat its carrier radio frequency or frequencies (RF) and its pulse-repetition interval or intervals (PRI), and determining the real time of arrival (TOA) of the pulses of each threat. All received threats in the trackers are scanned in succession periodically during scanning intervals. Each scanning interval is called a roll and each roll's duration (RO) is short compared to the PRI. During each scanning interval the TOA for the last-received pulse of each threat signal is compared with half the width of a window (W/2), neglecting the set-up time of the receiver. If TOA is greater than W/2 for any signal, RO is subtracted from the TOA and a new reduced TOA for this signal is stored in the tracker memory until the suceeding scanning operation when the above comparison and arithmetic operation is repeated. When the latest TOA is less than W/2 for any threat signal, the PRI for this signal is added to the TOA and the sum stored as the next TOA prediction for this threat signal. A correction is then carried out, during a short time interval about the pulse arrival time, to reduce the difference between the TOA and the zero of the window.
REFERENCES:
patent: 3707718 (1972-12-01), Ames
patent: 3900850 (1975-08-01), Ulman
patent: 3936823 (1976-02-01), Weber
patent: 3943510 (1976-03-01), Orton
Buczinski S.C.
Renz C. F.
Westinghouse Electric Corporation
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