公开(公告)号：AU5891100A

公开(公告)日：2001-04-17

申请号：AU5891100

申请日：2000-06-26

Applicant: MOTOROLA INC

Inventor： GROSS JONATHAN H ,  HANSON DUKE E ,  EMMONS THOMAS PETER JR ,  STARTUP JAMES W

IPC: H01Q1/28 ,  H01Q3/26 ,  H01Q21/29 ,  H04B7/185

公开(公告)号：AU3874700A

公开(公告)日：2000-10-09

申请号：AU3874700

申请日：2000-03-10

Applicant: MOTOROLA INC

Inventor： EMMONS THOMAS PETER JR ,  PETERS ROBERT ANTHONY ,  STARTUP JAMES W ,  MONSEN PETER

IPC: H04B7/185 ,  H04L1/00 ,  H04L1/02 ,  H04L25/20

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).