H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/21
H01Q 3/24 (2006.01) H04B 7/08 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 1085954
SECTORED ANTENNA RECEIVING SYSTEM ABSTRACT OF THE DISCLOSURE A plurality of horizontally directive antenna sectors are arranged in configuration to receive signals from remote transmitters over a given angle in the horizontal plane. A scanning system is operative in one of several modes to sequentially couple each sector to a receiver. In its first mode, each sector is sequentially scanned with the peak signal level therefrom being compared to a reference level. If the signal level on any sector exceeds its reference level the scanner activates to its second mode wherein scanning of all sectors continues for a predetermined interval after which the system advances to a selective scanning mode wherein scan is limited to that sector with the largest stored signal level relative to its reference level, and to those sectors adjacent said sector. At the end of this interval, scanning is inhibited and the receiver is coupled to that sector which exhibited the strongest relative signal level during the scanning sequences. In this inhibit scan mode, if the signal level from the sector falls to a minimum level for a given time period the system reverts to the first scanning mode. The system periodically updates the reference levels to account for changes in background noise or the presence of an interfering signal.
299062
Craig Timothy P.
Erickson Paul M.
Stimple James R.
Gowling Lafleur Henderson Llp
Motorola Inc.
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