公开(公告)号：AU3874600A

公开(公告)日：2000-10-16

申请号：AU3874600

申请日：2000-03-10

Applicant: MOTOROLA INC

Inventor： STARTUP JAMES WILLIAM ,  HELM JIM E ,  GROSS JONATHAN H

IPC: H04J4/00 ,  H04J13/00 ,  H04L27/00

公开(公告)号：AU3703600A

公开(公告)日：2000-09-14

申请号：AU3703600

申请日：2000-02-22

Applicant: MOTOROLA INC

Inventor： HELM JIM E ,  MAGEE STEVE ,  BISHOP JAMES WILLIAM JR

IPC: H04B7/185

公开(公告)号：AU1929101A

公开(公告)日：2001-06-18

申请号：AU1929101

申请日：2000-11-27

Applicant: MOTOROLA INC

Inventor： HELM JIM E ,  ARMBRUSTER PETER J ,  BUSH DAVID PHILIP

IPC: H04B7/185 ,  H04W84/02 ,  H04Q7/08

公开(公告)号：AU3498700A

公开(公告)日：2000-09-28

申请号：AU3498700

申请日：2000-02-22

Applicant: MOTOROLA INC

Inventor： STARTUP JAMES W ,  HELM JIM E ,  HOGBERG SHAWN WESLEY

IPC: H04B7/185 ,  H04B7/212

Abstract: A method and apparatus for acquiring satellite signals and subscriber unit signals utilizes broadcast beams (205) and acquisition beams (215) projected from a satellite (20). The broadcast beams (205) and acquisition beams (215) form broadcast acquisition beam pairs that are swept within the footprint (50) of the satellite (20) on the surface of the earth. Broadcast bursts are transmitted by the satellite (20) in the broadcast beams (205), and acquisition bursts broadcast by subscriber units (30) are received by the satellite (20) in acquisition beams (215).