WO2009150391A1 - Antenna support - Google Patents

Antenna support Download PDF

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Publication number
WO2009150391A1
WO2009150391A1 PCT/GB2008/050447 GB2008050447W WO2009150391A1 WO 2009150391 A1 WO2009150391 A1 WO 2009150391A1 GB 2008050447 W GB2008050447 W GB 2008050447W WO 2009150391 A1 WO2009150391 A1 WO 2009150391A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
section
compensation
support section
roll
Prior art date
Application number
PCT/GB2008/050447
Other languages
French (fr)
Inventor
Matthew Wright
Original Assignee
Global View Systems Limited
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 Global View Systems Limited filed Critical Global View Systems Limited
Priority to PCT/GB2008/050447 priority Critical patent/WO2009150391A1/en
Publication of WO2009150391A1 publication Critical patent/WO2009150391A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
    • H01Q3/08—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/34—Adaptation for use in or on ships, submarines, buoys or torpedoes

Definitions

  • This invention relates to a support for an antenna, particularly, but not limited to a system for supporting an antenna in a marine environment.
  • the task of stabilising an antenna in a marine environment is difficult, because it is necessary to keep an antenna directed towards a fixed object (such as a satellite) whilst the antenna is moving due to movement of a vessel on which it is located moving in water.
  • a fixed object such as a satellite
  • Movement compensation in a marine environment is typically compensated in pitch, roll and yaw.
  • Pitch is movement about a nominally horizontal axis that is perpendicular to a nominal forward direction.
  • Roll is movement about a nominally horizontal axis that is parallel to a nominal forward direction.
  • Yaw is movement about a nominally vertical axis.
  • An axis for roll compensation is often referred to as a tilt or cross-level axis.
  • a support for a communications device the support being operable to compensate for or provide pitch, roll and yaw movements, wherein a support section for roll compensation is spaced from an axis for roll compensation.
  • At least a part of the support section for roll compensation forms an arc having a radius of curvature substantially centred on an axis for roll compensation.
  • the axis may be non-intersecting with an axis for pitch compensation .
  • the support section for roll compensation may be mounted on an arcuate base, an arc of said base matching the curvature of the support section for roll compensation.
  • the arcuate base may incorporate friction reducing means, such as roller bearings.
  • Drive means for the support section for roll compensation preferably engage the support section, preferably the arcuate section of the support section.
  • the support section for roll compensation is adapted to be driven at the arcuate section.
  • the support section for roll compensation is drivable through at least 20° either side of vertical, more preferably about 25°.
  • a drive gear of the drive means may engage a rack, or gear arc, of the support section for roll compensation.
  • Said rack may be located on an upper side of said support section for roll compensation.
  • the support section for roll compensation may have elongate arms, preferably located either side of the arcuate section.
  • the arms and arcuate section preferably form a channel section.
  • the arms are preferably substantially straight.
  • the arms preferably define a space, in which space a communications device can be supported.
  • the communications device may be an antenna, such as a lens and transmitter/receiver, a reflector and transceiver, or a camera, or other transceiver.
  • the support section for roll compensation preferably accommodates a support section for pitch compensation within a space defined by a perimeter of the support section for roll compensation.
  • the support section for roll compensation preferably accommodates the support section for pitch compensation between the arms of the support section for roll compensation .
  • the reference to roll compensation may be tilt compensation.
  • the reference to pitch compensation may be elevation compensation.
  • the communications device is advantageously able to move through at least a 180° rotation about a pitch axis when the support section for pitch compensation carries the communications device.
  • Drive means for the support section for pitch compensation may be attached to the arms of the support section for roll compensation, preferably within a channel section forming the arms .
  • a support structure for a communications device comprising a support section for roll compensation, wherein the support structure comprises an opening in which to receive a support section for pitch compensation, wherein the support structure is operable to allow rotation of a communications device held by the support section for pitch control through at least 180°.
  • Figure 1 is a schematic perspective view of a waveguide lens antenna carried on an antenna stabilisation system
  • Figure 2 is a schematic partial view of a cross-level channel section of the antenna stabilisation system, showing a range of movement thereof;
  • Figure 3 is a schematic partial perspective view of a pivot point connection at an end of the cross-level channel section.
  • FIG. 4 is a schematic partial perspective view of a lower section of the cross-level channel showing a drive mechanism thereof.
  • a waveguide lens 10 is supported in a support system comprising a cross-level (roll) adjustment section (12,14,16), an elevation axis (pitch) adjustment section (18,20) and a yaw adjustment section (not shown) .
  • the cross level adjustment section structure is shown in Figure 1, in which a cross-level channel section 12 is an aluminium channel section to house a waveguide lens antenna 10 and an elevation arm structure 18. Yaw control is provided by a turntable arrangement (not shown) that allows rotation through 360 degrees, based on a driven planetary spur gear and a fixed gear.
  • the support system is secured to a vehicle e.g. a seagoing vessel or land vehicle by a vibration-reducing mount comprising four 45 degree mounted cable isolators.
  • a cross-level roller unit 16 ensures smooth rotation of channel section 12 with respect to the yaw control section.
  • a cross-level drive gear is shown at 14.
  • the channel section 12 uses track rollers 22 (see Figure 2) housed within the channel section 12 to assist with the desired motion.
  • the track rollers 22 are located in the cross-level roller unit 16 and support the channel section 12 from below.
  • the track rollers 22 are arranged in an arc in the cross-level roller unit 16 in order to match the arc of the lower part of the channel section 12.
  • a drive motor for the channel section 12 is directly attached to the cross-level gear 14 which is meshed to a gear arc 24 directly fixed to an upper section of the channel section 12.
  • the channel section 12 can then be rotated to the ends of the gear arc 24, which limit the range of movement of the channel section 12 in the roll orientation for a given selected length of gear arc 24.
  • a servo motor is attached to the drive shaft of the cross-level gear 14 via a shaft coupler and in turn drives the pinion in the centre with rotation assisted via spherical bearing in the cross-level roller unit 16.
  • the channel section 12 is secured in position from above by the meshing of the cross-level gear 14 with the gear arc 24. This prevents the channel section lifting out of engagement with the cross-level roller unit 16.
  • Fig 2 shows the rotation of the cross-level arc.
  • the extent of movement to the left is shown.
  • the extent of movement to the right is shown.
  • the central part of the Figure the central position is shown.
  • rotation of the cross-level gear 14 causes rotation of the channel section 12.
  • Fig 4 shows in greater detail the cross-level drive gear 14 and the cross-level gear arc 24 attached to the channel section.
  • Fig 3 shows an inner face of the channel section 12 and a pivot point connection 20 located at and upper end of the channel section 12 where the channel section 12 is straight.
  • the custom elevation bearing assembly housing is fixed directly to the channel section 12.
  • a waveguide lens elevation arm 18 is connected to the pivot points 20 at each side of the channel section 12 allowing for rotation about this axis.
  • the channel section 12 allows drive components for the elevation arm 18 to be discretely positioned within the channel section without adding excessively to the overall width of the unit.
  • a rear section 26 of the elevation arm 18 houses an LNB rack (not shown) .
  • An LNB rack as described in
  • PCT/GB2007/050784 could advantageously be used.
  • the concept of the U-shaped channel section 12 is specifically important to a lens based antenna system, such as those described in PCT/GB2007/050783 and PCT/GB2007/050782, because the focal plane to the rear of the lens antenna 10 must be clear from potential blockages.
  • the antenna 10 may usefully have an LNB located centrally on the rear section 26 to act as a central bore sight LNB, which is used for tracking.
  • Auxiliary LNBs located towards ends of the rear section 26 receive signals from additional transponders within the geostationary (Clarke belt) orbit.
  • the main features of the cross-level channel section 12 are that it allows for a variety of antennae to be attached to the stabilised platform. Specifically however it allows the waveguide lens antenna 10 with its long focal distance to rotate through >180degrees without collision.
  • the channel design is easily scalable increasing its effectiveness within a product range. As stated the channel itself allows the drive components to be housed along with assisting cable management. Also the channel section 12 houses a counterbalance.
  • the antenna 10 is directed at a satellite or other communications apparatus by controlling the turntable for yaw control, the elevation arm 18 for elevation control and the cross-level channel section for tilt control.
  • Respective motors for each can be attached to movement sensors (such as an above decks rack having an inertial measurement, IMU, sensor system and servo drive controllers) so that compensation for movement can be provided.
  • the basic structure of the support structure uses the U- shaped channel section 12 to great advantage. Within this structure the elevation arm 18 is held and is free to rotate through 270 degrees without conflict between fixed structural components.
  • the U-shaped channel section can be used to accommodate many different antennae, such as parabolic dishes, or even cameras.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A support for a communications device, the support being operable to compensate for or provide pitch, roll and yaw movements, wherein a support section for roll compensation is spaced from an axis for roll compensation.

Description

Antenna Support
This invention relates to a support for an antenna, particularly, but not limited to a system for supporting an antenna in a marine environment.
The task of stabilising an antenna in a marine environment is difficult, because it is necessary to keep an antenna directed towards a fixed object (such as a satellite) whilst the antenna is moving due to movement of a vessel on which it is located moving in water.
Movement compensation in a marine environment is typically compensated in pitch, roll and yaw. Pitch is movement about a nominally horizontal axis that is perpendicular to a nominal forward direction. Roll is movement about a nominally horizontal axis that is parallel to a nominal forward direction. Yaw is movement about a nominally vertical axis.
An axis for roll compensation is often referred to as a tilt or cross-level axis.
It is an object of the present invention to address the abovementioned disadvantages.
According to the present invention there is provided an apparatus and method as set forth in the appended claims. Other features of the invention will be apparent from the dependent claims, and the description which follows.
According to an aspect of the present invention there is provided a support for a communications device, the support being operable to compensate for or provide pitch, roll and yaw movements, wherein a support section for roll compensation is spaced from an axis for roll compensation.
At least a part of the support section for roll compensation forms an arc having a radius of curvature substantially centred on an axis for roll compensation. The axis may be non-intersecting with an axis for pitch compensation .
The support section for roll compensation may be mounted on an arcuate base, an arc of said base matching the curvature of the support section for roll compensation. The arcuate base may incorporate friction reducing means, such as roller bearings.
Drive means for the support section for roll compensation preferably engage the support section, preferably the arcuate section of the support section. Preferably, the support section for roll compensation is adapted to be driven at the arcuate section. Preferably, the support section for roll compensation is drivable through at least 20° either side of vertical, more preferably about 25°.
A drive gear of the drive means may engage a rack, or gear arc, of the support section for roll compensation. Said rack may be located on an upper side of said support section for roll compensation.
The support section for roll compensation may have elongate arms, preferably located either side of the arcuate section. The arms and arcuate section preferably form a channel section. The arms are preferably substantially straight. The arms preferably define a space, in which space a communications device can be supported.
The communications device may be an antenna, such as a lens and transmitter/receiver, a reflector and transceiver, or a camera, or other transceiver.
The support section for roll compensation preferably accommodates a support section for pitch compensation within a space defined by a perimeter of the support section for roll compensation.
The support section for roll compensation preferably accommodates the support section for pitch compensation between the arms of the support section for roll compensation .
The reference to roll compensation may be tilt compensation. The reference to pitch compensation may be elevation compensation.
The communications device is advantageously able to move through at least a 180° rotation about a pitch axis when the support section for pitch compensation carries the communications device.
Drive means for the support section for pitch compensation may be attached to the arms of the support section for roll compensation, preferably within a channel section forming the arms . According to another aspect of the invention there is provided a support structure for a communications device, the support structure comprising a support section for roll compensation, wherein the support structure comprises an opening in which to receive a support section for pitch compensation, wherein the support structure is operable to allow rotation of a communications device held by the support section for pitch control through at least 180°.
All of the features described herein may be combined with any of the above aspects, in any combination.
For a better understanding of the invention, and to show how embodiments of the same may be carried into effect, reference will now be made, by way of example, to the accompanying diagrammatic drawings in which:
Figure 1 is a schematic perspective view of a waveguide lens antenna carried on an antenna stabilisation system;
Figure 2 is a schematic partial view of a cross-level channel section of the antenna stabilisation system, showing a range of movement thereof;
Figure 3 is a schematic partial perspective view of a pivot point connection at an end of the cross-level channel section; and
Figure 4 is a schematic partial perspective view of a lower section of the cross-level channel showing a drive mechanism thereof. A waveguide lens 10 is supported in a support system comprising a cross-level (roll) adjustment section (12,14,16), an elevation axis (pitch) adjustment section (18,20) and a yaw adjustment section (not shown) .
The cross level adjustment section structure is shown in Figure 1, in which a cross-level channel section 12 is an aluminium channel section to house a waveguide lens antenna 10 and an elevation arm structure 18. Yaw control is provided by a turntable arrangement (not shown) that allows rotation through 360 degrees, based on a driven planetary spur gear and a fixed gear.
The support system is secured to a vehicle e.g. a seagoing vessel or land vehicle by a vibration-reducing mount comprising four 45 degree mounted cable isolators.
The cross-level adjustment section (12,14,16) and elevation axis adjustment section (18,20) will now be described in more detail. With
A cross-level roller unit 16 ensures smooth rotation of channel section 12 with respect to the yaw control section. A cross-level drive gear is shown at 14.
The channel section 12 uses track rollers 22 (see Figure 2) housed within the channel section 12 to assist with the desired motion.
The track rollers 22 are located in the cross-level roller unit 16 and support the channel section 12 from below. The track rollers 22 are arranged in an arc in the cross-level roller unit 16 in order to match the arc of the lower part of the channel section 12.
A drive motor for the channel section 12 is directly attached to the cross-level gear 14 which is meshed to a gear arc 24 directly fixed to an upper section of the channel section 12. The channel section 12 can then be rotated to the ends of the gear arc 24, which limit the range of movement of the channel section 12 in the roll orientation for a given selected length of gear arc 24.
In the cross-level axis drive train a servo motor is attached to the drive shaft of the cross-level gear 14 via a shaft coupler and in turn drives the pinion in the centre with rotation assisted via spherical bearing in the cross-level roller unit 16.
The channel section 12 is secured in position from above by the meshing of the cross-level gear 14 with the gear arc 24. This prevents the channel section lifting out of engagement with the cross-level roller unit 16.
Fig 2 shows the rotation of the cross-level arc. In the left hand part of the Figure the extent of movement to the left is shown. In the right hand part of the Figure the extent of movement to the right is shown. In the central part of the Figure the central position is shown. It can be seen that rotation of the cross-level gear 14 causes rotation of the channel section 12. Fig 4 shows in greater detail the cross-level drive gear 14 and the cross-level gear arc 24 attached to the channel section. Fig 3 shows an inner face of the channel section 12 and a pivot point connection 20 located at and upper end of the channel section 12 where the channel section 12 is straight. The custom elevation bearing assembly housing is fixed directly to the channel section 12.
A waveguide lens elevation arm 18 is connected to the pivot points 20 at each side of the channel section 12 allowing for rotation about this axis. The channel section 12 allows drive components for the elevation arm 18 to be discretely positioned within the channel section without adding excessively to the overall width of the unit.
A rear section 26 of the elevation arm 18 houses an LNB rack (not shown) . An LNB rack as described in
PCT/GB2007/050784 could advantageously be used. The concept of the U-shaped channel section 12 is specifically important to a lens based antenna system, such as those described in PCT/GB2007/050783 and PCT/GB2007/050782, because the focal plane to the rear of the lens antenna 10 must be clear from potential blockages. The antenna 10 may usefully have an LNB located centrally on the rear section 26 to act as a central bore sight LNB, which is used for tracking. Auxiliary LNBs located towards ends of the rear section 26 receive signals from additional transponders within the geostationary (Clarke belt) orbit.
The main features of the cross-level channel section 12 are that it allows for a variety of antennae to be attached to the stabilised platform. Specifically however it allows the waveguide lens antenna 10 with its long focal distance to rotate through >180degrees without collision. The channel design is easily scalable increasing its effectiveness within a product range. As stated the channel itself allows the drive components to be housed along with assisting cable management. Also the channel section 12 houses a counterbalance.
In use the antenna 10 is directed at a satellite or other communications apparatus by controlling the turntable for yaw control, the elevation arm 18 for elevation control and the cross-level channel section for tilt control. Respective motors for each can be attached to movement sensors (such as an above decks rack having an inertial measurement, IMU, sensor system and servo drive controllers) so that compensation for movement can be provided.
The basic structure of the support structure uses the U- shaped channel section 12 to great advantage. Within this structure the elevation arm 18 is held and is free to rotate through 270 degrees without conflict between fixed structural components. The U-shaped channel section can be used to accommodate many different antennae, such as parabolic dishes, or even cameras.
Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment (s) . The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

1. A support for a communications device, the support being operable to compensate for or provide pitch, roll and yaw movements, wherein a support section for roll compensation is spaced from an axis for roll compensation.
2. A support as claimed in claim 1, in which at least a part of the support section for roll compensation forms an arc having a radius of curvature substantially centred on an axis for roll compensation.
3. A support as claimed in claim 1 or claim 2, in which the support section for roll compensation is mounted on an arcuate base, an arc of said base matching the curvature of the support section for roll compensation.
4. A support as claimed in any preceding claim comprising drive means engaging the support section for roll compensation
5. A support as claimed in claim 4, in which the support section for roll compensation is adapted to be driven at an arcuate section thereof.
6. A support as claimed in claim 4 or claim 5, in which a drive gear of the drive means engages a rack, or gear arc, of the support section for roll compensation.
7. A support as claimed in any preceding claim wherein the support section for roll compensation has elongate arms, located either side of the arcuate section.
8. A support as claimed in claim 7, in which the arms are substantially straight and define a space, in which space a communications device can be supported.
9. A support as claimed in any preceding claim, in which the support section for roll compensation accommodates a support section for pitch compensation within a space defined by a perimeter of the support section for roll compensation .
10. A support as claimed in claim 9, in which drive means for the support section for pitch compensation are attached to the arms of the support section for roll compensation .
11. A support structure for a communications device, the support structure comprising a support section for roll compensation, wherein the support structure comprises an opening in which to receive a support section for pitch compensation, wherein the support structure is operable to allow rotation of a communications device held by the support section for pitch control through at least 180°.
PCT/GB2008/050447 2008-06-13 2008-06-13 Antenna support WO2009150391A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/GB2008/050447 WO2009150391A1 (en) 2008-06-13 2008-06-13 Antenna support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB2008/050447 WO2009150391A1 (en) 2008-06-13 2008-06-13 Antenna support

Publications (1)

Publication Number Publication Date
WO2009150391A1 true WO2009150391A1 (en) 2009-12-17

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Application Number Title Priority Date Filing Date
PCT/GB2008/050447 WO2009150391A1 (en) 2008-06-13 2008-06-13 Antenna support

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117559111A (en) * 2024-01-12 2024-02-13 常州市军锐机械有限公司 Radar antenna revolving stage with stop device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439550A (en) * 1967-03-06 1969-04-22 Electronic Specialty Co Mechanical movement apparatus
EP0154240A2 (en) * 1984-02-17 1985-09-11 Comsat Telesystems, Inc. Satellite tracking antenna system
WO1992008107A1 (en) * 1990-10-25 1992-05-14 Donald Burkhardt Apparatus for projecting artificial horizon viewable by peripheral vision
WO1998057389A1 (en) * 1997-06-13 1998-12-17 Trulstech Innovation Kb An arrangement comprising an antenna reflector and a transceiver horn combined to form a compact antenna unit
US6266029B1 (en) * 1998-12-22 2001-07-24 Datron/Transco Inc. Luneberg lens antenna with multiple gimbaled RF feeds
US20040150574A1 (en) * 2003-01-30 2004-08-05 Harron Brian A. Gimballed reflector mounting platform

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439550A (en) * 1967-03-06 1969-04-22 Electronic Specialty Co Mechanical movement apparatus
EP0154240A2 (en) * 1984-02-17 1985-09-11 Comsat Telesystems, Inc. Satellite tracking antenna system
WO1992008107A1 (en) * 1990-10-25 1992-05-14 Donald Burkhardt Apparatus for projecting artificial horizon viewable by peripheral vision
WO1998057389A1 (en) * 1997-06-13 1998-12-17 Trulstech Innovation Kb An arrangement comprising an antenna reflector and a transceiver horn combined to form a compact antenna unit
US6266029B1 (en) * 1998-12-22 2001-07-24 Datron/Transco Inc. Luneberg lens antenna with multiple gimbaled RF feeds
US20040150574A1 (en) * 2003-01-30 2004-08-05 Harron Brian A. Gimballed reflector mounting platform

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117559111A (en) * 2024-01-12 2024-02-13 常州市军锐机械有限公司 Radar antenna revolving stage with stop device
CN117559111B (en) * 2024-01-12 2024-04-23 常州市军锐机械有限公司 Radar antenna revolving stage with stop device

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