公开(公告)号：CA1110329A

公开(公告)日：1981-10-06

申请号：CA299314

申请日：1978-03-20

Applicant: MOTOROLA INC

Inventor： STIMPLE JAMES R ,  ERICKSON PAUL M

IPC: H01Q3/24 ,  H04B7/02 ,  H04B7/10 ,  H04B1/06

Abstract: ANTENNA SAMPLING SYSTEM Each of a plurality of antenna sectors is sequentially coupled to a receiver via an antenna switch. The switch is operated by control logic circuitry which monitors the peak signal levels of the signals received by each sector. Unique circuitry is implemented which prevents the control logic from responding to spurious transient signals processed by the receiver's tuned circuits following each instance of antenna switching.

公开(公告)号：CA1110708A

公开(公告)日：1981-10-13

申请号：CA298517

申请日：1978-03-08

Applicant: MOTOROLA INC

Inventor： CRAIG TIMOTHY P ,  STIMPLE JAMES R

IPC: H01Q3/24 ,  H04B7/08 ,  H04B7/10 ,  H04B7/26

Abstract: SECTORED ANTENNA RECEIVING SYSTEM 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 output signal level therefrom being compared to a reference level. If the signal level on any sector exceeds the reference level the scanner activates to its second mode wherein scanning continues for a predetermined interval. At the end of the interval, scanning is inhibited and the receiver is coupled to that sector which produced the strongest signal level during the second mode scanning cycle. In the 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.

公开(公告)号：CA1085954A

公开(公告)日：1980-09-16

申请号：CA299062

申请日：1978-03-16

Applicant: MOTOROLA INC

Inventor： CRAIG TIMOTHY P ,  STIMPLE JAMES R ,  ERICKSON PAUL M

IPC: H01Q3/24 ,  H04B7/08 ,  H04B7/10 ,  H04B7/26 ,  H04W16/24

Abstract: SECTORED ANTENNA RECEIVING SYSTEM 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.