JPS57113640A - Control system for antenna directivity for artificial satellite - Google Patents

Control system for antenna directivity for artificial satellite

Info

Publication number
JPS57113640A
JPS57113640A JP27481A JP27481A JPS57113640A JP S57113640 A JPS57113640 A JP S57113640A JP 27481 A JP27481 A JP 27481A JP 27481 A JP27481 A JP 27481A JP S57113640 A JPS57113640 A JP S57113640A
Authority
JP
Japan
Prior art keywords
directivity
antennas
antenna
artificial satellite
earth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP27481A
Other languages
Japanese (ja)
Inventor
Yoshihiko Hishida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP27481A priority Critical patent/JPS57113640A/en
Publication of JPS57113640A publication Critical patent/JPS57113640A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To achieve efficient communication, by providing a plurality of antennas with different directivity with an artificial satellite, and selectively using the antennas having the maximum gain toward a ground station. CONSTITUTION:A plurality of antennas 13a-13i are fitted to a plane (lower plane) 12 of an artificial satellite 11 opposing to the earth, the main axis of directivity patterns 14-16 of each antenna is different, and when a half-amplitude level of the directivity is 40 deg., the main axis of directivity is shifted by 40 deg.. Cone shape overall directivity with 120 deg. is obtained toward the earth from the lower plane 12 of the artificial satellite 11. When the satellite 11 passes just above the earth station 17, since the distance is the nearest than other states, the gain of the antenna 13b is reduced and the half-amplitude level of the directivity is taken greater, allowing to increase the gain of the antennas 13a, 13c. When electromagnetic waves are transmitted from the earth station 17, they are received at all the antennas 13a-13i, an antenna having the maximum input is selected and transmission/reception can be made by using the antenna.
JP27481A 1981-01-07 1981-01-07 Control system for antenna directivity for artificial satellite Pending JPS57113640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27481A JPS57113640A (en) 1981-01-07 1981-01-07 Control system for antenna directivity for artificial satellite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27481A JPS57113640A (en) 1981-01-07 1981-01-07 Control system for antenna directivity for artificial satellite

Publications (1)

Publication Number Publication Date
JPS57113640A true JPS57113640A (en) 1982-07-15

Family

ID=11469320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27481A Pending JPS57113640A (en) 1981-01-07 1981-01-07 Control system for antenna directivity for artificial satellite

Country Status (1)

Country Link
JP (1) JPS57113640A (en)

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