Title:
SPACE OPTICAL TRANSMISSION DEVICE AND SPACE OPTICAL TRANSMISSION METHOD
Document Type and Number:
Japanese Patent JP3695580
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve the problem in a conventional space optical transmission device that precise tracking and directive performance is easily influenced by background light to cause the interference of the control band of a two-axial gimbal mechanism with the frequency of a satellite in tracking.
SOLUTION: In this space optical transmission device, a program tracking is performed before capture while predicting the directing direction of a counter station to capture the counter station in the capturing field of view, rough capture tracking and precise capture tracking are performed in a closed loop after receiving the receiving light from the counter station, and a transmission light is directed to the direction of the counter station to perform a communication. This device comprises a program tracking angle correction circuit 10 for correcting, after the rough capture tracking and precise capture tracking of the receiving light from the counter station, a program tracking angle signal for performing the program tracking with a drive angle signal for driving a beam deflector 4 included in the closed loop for performing the rough capture tracking to the precise capture tracking.
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Inventors:
Koichi Shiratama
Application Number:
JP2001152662A
Publication Date:
September 14, 2005
Filing Date:
May 22, 2001
Export Citation:
Assignee:
nec Toshiba Space Systems Co., Ltd.
International Classes:
G01S3/42; G01S3/785; H04B10/07; H04B10/11; H04B10/112; (IPC1-7): G01S3/785; G01S3/42; H04B10/10; H04B10/105; H04B10/22
Domestic Patent References:
| JP11109012A | ||||
| JP10246762A |
Attorney, Agent or Firm:
Masahiko Desk
Masashi Kudo
Yasuhisa Tanizawa
Masashi Kudo
Yasuhisa Tanizawa