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EP0106178A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Automatic tracking system for antenna

Assignee: NEC Corp
•
Filing: 1983-09-16
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Granted: —
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Expires: 2003-09-16
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Abstract

Abstract An automatic tracking system for an antenna device for satellite communications and using step tracking principles is disclosed which repeatedly effects tracking at predetermined intervals so that the receive electric field from the satellite becomes maximum. When a platform (10) loaded with an antenna device for satellite communications is caused to sway to an inclined position during an interval between sequential tracking operations, sensors (26, 28) senses a pitching angle and a rolling angle of the platform. The outputs of the sensors are compared with an angle previously stored as an inclination angle of the platform which existed just before interval between sequential tracking operations. If the difference is larger than a predetermined value, step tracking is resumed to track the satellite even in a suspension period of step tracking.

Inventors

  • 👤 Takao Kuroda
  • 👤 Ryuji Shimizu

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-27 21:00
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/18; G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/38; G01S3/44

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 157 words
An automatic tracking system for an antenna comprising: an antenna for communications with a stationary satellite loaded on a body which sways; azimuth. drive means and elevation drive means for driving said antenna in azimuth and elevation, respectively; drive control means for intermittently driving said drive means such that an electric field which the antenna receives from the satellite becomes maximum; sensor means for sensing an angle of inclination when said body sways; and control means for storing an angle of inclination of said body occurred during a non-driven period of the intermittently driven azimuth and elevation drive means, comparing said angle of inclination with the angle of inclination sensed by the sensor means, and, if a difference provided by the comparison is larger than a predetermined value, causing the drive control means to resume the operation of the azimuth and elevation drive means even when the azimuth and elevation drive means are in a non-driven period.
Claim 2
Dependent Claim 157 words
An automatic tracking system for an antenna comprising: an antenna for communications with a stationary satellite loaded on a body which sways; azimuth. drive means and elevation drive means for driving said antenna in azimuth and elevation, respectively; drive control means for intermittently driving said drive means such that an electric field which the antenna receives from the satellite becomes maximum; sensor means for sensing an angle of inclination when said body sways; and control means for storing an angle of inclination of said body occurred during a non-driven period of the intermittently driven azimuth and elevation drive means, comparing said angle of inclination with the angle of inclination sensed by the sensor means, and, if a difference provided by the comparison is larger than a predetermined value, causing the drive control means to resume the operation of the azimuth and elevation drive means even when the azimuth and elevation drive means are in a non-driven period.
Claim 3
Dependent Claim 38 words
The automatic tracking system as claimed in claim 1, in which the sensor means comprises a pitching sensor responsive to a pitching angle of the body and a rolling sensor responsive to a rolling angle of the body.
Claim 4
Dependent Claim 21 words
The automatic tracking system as claimed in claim 2, in which each of the pitching and rolling sensors comprises a level.
Claim 5
Dependent Claim 23 words
The automatic tracking system as claimed in claim 1, in which the control means comprises an interface circuit which includes a microcomputer therein.
Claim 6
Dependent Claim 16 words
The automatic tracking system as claimed in claim 1, in which the body comprises a platform.
Claim 7
Dependent Claim 17 words
The automatic tracking system as claimed in claim 5, in which the platform comprises an oil rig.

References Cited (Backward Citations)

US4030099A Cited
US4100472A Cited
US4156241A Cited
US4334226A Cited

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