1. Field
The present invention relates generally to communications systems, and, particularly, to communications systems including inflatable antennas, and, more particularly, to automatically deployable communications systems including inflatable antennas.
2. Description of the Problem and Related Art
Inflatable antennas have shown advantages over their more rigid counterparts in that inflatable version are light weight and more portable. One such inflatable antenna was disclosed in U.S. Pat. No. 6,963,315, to Gierow, et al. These inflatable antennas have demonstrated particularly responsive to shortcomings found in the prior art relating to rapid deployment and ease of operation, especially in remote areas and emergency scenarios, for example, after a natural disaster occurs.
To improve upon the numerous benefits of inflatable antennas, the present disclosure provides a self-contained system, housed in a portable case, which allows automatic deployment of the antenna with little-to-no user action necessary.
The present invention is described with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Additionally, the left-most digit(s) of a reference number identifies the drawing in which the reference number first appears.
The various embodiments of the present invention and their advantages are best understood by referring to
Furthermore, reference in the specification to “an embodiment,” “one embodiment,” “various embodiments,” or any variant thereof means that a particular feature or aspect of the invention described in conjunction with the particular embodiment is included in at least one embodiment of the present invention. Thus, the appearance of the phrases “in one embodiment,” “in another embodiment,” or variations thereof in various places throughout the specification are not necessarily all referring to its respective embodiment.
A controller 106, which is preferably a computer-based controller, is configured with control logic 108 (described in greater detail below) and is responsive to the measured azimuth and elevation signals 113 received from the azimuth and elevation sensors 109. The controller 106 also receives input from the transceiver 104 representing signal strength of the received satellite signals 114. The controller 106 is configured to output control signals 116a, 116b to the azimuth and elevation drive motors 110, 111, respectively, based upon manual input from a user through the user interface 118 or automatically, using a tracking algorithm within the control logic 108 which is configured to automatically position the antenna optimally for transmission and receipt of electromagnetic signals with, for example, a satellite, based upon measured azimuth and elevation signals 113.
The inflation control subsystem 103 may be as embodied in co-owned U.S. Pat. No. 8,021,122, to Clayton, and comprise pressure sensors 125 for detecting pressure within the chambers 122a, 122b. Pressure sensor 125 measurements 115 are relayed by the inflation control subsystem 103 to the controller 106 where it is received as input by control logic 108 which is configured to output control signals for energizing and de-energizing the blower subsystem 103 in order to maintain proper pressures within each chamber 122a, 122b. In addition, controller 106 also issues control signals 117 to pole motor 112 to control adjustment of the feed horn 102 position relative to the dish 121 as mentioned above.
The system 100 also includes a power supply module 105 for providing power 119 to energize the various components. The power supply module 105 may be coupled to an energy storage device 125, e.g., a battery, or may be configured to be coupled to external power 126.
In response to these inputs, and as may be directed by the algorithm executed by the control logic 108, the controller 106 issues energized command signals 116, 117, to the azimuth and elevation position motors 110, 111 or to the pole motor 112. Motors 110, 111, 112 are configured to actuate the antenna or the feed horn in two directions in their respective planes of motion. Some signal processing may be necessary with regard to control of the azimuth and elevation motors 110, 111. In one embodiment, motors 110, 111 require analog control signals 116 and thus, a digital-to-analog converter 207 may be required as well. It may also be advantageous in another embodiment to include a signal conditioner 208 to pre-process the analog signals prior to energizing the motors 110, 111.
Azimuth and elevation motors 110, 111 are energized through the controller 106 as set out above. However, in one embodiment the system 100 may include manual switches for selecting azimuth and elevation 308, 307 respectively, which may also energize the motors 110, 111. In addition, the system 100 preferably includes a pressure switch 309 intermediate the controller 106 and the inflation control module 304.
Two antenna support members 403 are attached to the front inside wall of the box 411 and two antenna support members 405 are attached to the inside surface of the lid 407. Preferably, in the illustrated embodiment, the lid 407 further includes one or more supports 409 for keeping the lid 407 parallel to the horizontal plane, or more particularly, for keeping the support members 403, 405 all in the same horizontal plane so that the antenna 101 remains on a parallel plane with respect to the horizontal plane in order to provide an orientation reference for controlling position. In this embodiment, elevation and azimuth positioning is accomplished with a drive belt 501 having ends that are attached to the surface of the antenna 101 on either side of the lower hemisphere along a longitude line (dashed line A) of the 101 passing also through the location at which the feed horn 102 is mounted.
Antenna support members 403, 405 comprise a sphere 601 mounted through its axis 604 on an elongated rod 603 and allowed to revolve freely about the rod 603. The elongated rod 603 may include two bends 602, 606, each at about a 45° angle, dividing the rod into three portions 603a, 603b, 603c, the latter 603c departing the plane defined by the first two portions 603a, 603b, at about a 45° angle. As illustrated in
The interior chamber 402 of the box 411 provides a housing for the control components of the system, namely, the power supply module 105, the controller 106, which may also include the receiver 104, modem 124, and the inflation control 103, the battery 127 and a spring return switch 303 that is mounted proximal to the top edge of the box 411 such that it closes the power circuit when the lid 407 is opened as described above, and remains open while the lid 407 is closed. The interior chamber 402 also contains the antenna 101 when it is non-inflated (
The azimuth and elevation motors 110, 111 are employed in this embodiment with a t-bar 801. The elevation motor 111 is mounted to one end of the “T” 701 of the t-bar 801, and rotates a wheel 803 in the vertical plane and is configured to rotate the wheel 803 in either clockwise or counter-clockwise direction. The wheel 803 is engaged with the drive belt 501, so that rotation of the wheel 803 pulls the drive belt 501 in one direction or the other. A pulley 805 may be provided, mounted at the opposite end of the “T” 701 to insure the belt 501 remains engaged with the wheel 803. The upright portion 807 of the t-bar 801 is attached to a driven pulley 805 that lies in the horizontal plane, and is driven by the azimuth motor 110, likewise configured to rotate the pulley 805 in either a clockwise or counter-clockwise direction.
With reference again to
In operation, the user selects either automatic deployment or manual deployment using the power mode switch 301 placed on the exterior of case 401. In automatic deployment mode, the spring switch 303 remains open until the lid 407 is opened whereupon the switch 303 closes the power circuit. Power supply circuit 105 provides power supplied from either battery 125 or from an external power source 126. Power is applied to the controller 106 and to the inflation control subsystem 103 where the inflation control module 304 energizes the blowers 305 to begin impelling air into the plenum chambers 122a, 122b. The inflation control module 304 samples the pressures within the chambers 122a, 122b through sensing tubes 309 and is configured with control logic, e.g., 108, which commands de-energizing of the blowers 305 when the proper pressures are reached. A pressure activated switch 310 may be used which is configured to maintain a closed circuit with the inflation control module 304 and to open when the proper pressure in the plenum chambers 122a, 122b is reached. The antenna 101 inflates and emerges from the box 411 and ultimately comes to rest on the upright antenna support members 403, 405, and specifically, upon the spheres 603 mounted thereon. Antenna positioning via the azimuth and elevation motors 110, 111 is conducted and the receiver 104 may then be coupled to a communications satellite selected by the user through the user interface 118.
With reference now to
It will be appreciated by those skilled in the relevant arts with the benefit of this disclosure that the radius of the arc defined by the arcuate arms 1109 may be concentric with the center of the antenna. However, in order to achieve a greater range of motion in the elevation plane, the length of the arcuate arms may exceed the dimensions of the case. Consequently, to achieve a fuller range of motion it may be desirable to reduce the radius of curvature of the arms 1109 such that the center of the arc defined by the arms is below that of the antenna. Preferably, the radius of curvature of the arms is about half that of the antenna.
Returning to
An azimuth drive motor 110 is mounted to by base support flange 1111 and is coupled to the turn table 1107 to provide rotation of the turn table 1107 in the horizontal plane. An elevation drive motor 1125 is mounted to the inside surface of the box 411 and is coupled to a pulley 1126 with which is engaged a belt 1127 attached to the support flange 1111 such that rotation of the pulley 1126 in one direction pulls the belt 1127 causing the flange 1111, and thus, the base 1103, to elevate, supported by the flange's pivotal connection to the elevator assembly 1105 levers, whereas rotation of the pulley 1126 in the opposite direction lowers the flange 1111, and thus, the base 1103.
In this embodiment, the base 1103 also comprises a plurality of support arms 1115 that extend radially from the pedestal 1113 and whose radially outward ends are attached to the surface of the antenna 101 within the lower hemisphere, as shown.
In addition, this embodiment includes a collapsible feed horn assembly 102 illustrated in
As described above and shown in the associated drawings, the present invention comprises an automatically deployable communications system. While particular embodiments of the apparatus have been described, it will be understood, however, that the invention represented by the disclosed apparatus is not limited thereto, since modifications may be made by those skilled in the art, particularly in light of the foregoing teachings. It is, therefore, contemplated by the appended claims to cover any such modifications that incorporate those features or those improvements that embody the spirit and scope of the invention claimed.
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Freeland, R. E. et al.; Development of Flight Hardware for a Large, Inflatable-Deployable Antenna Experiment, Jet Propulsion Laboratory, Pasadena, California, 2014; http://web.archive.org/web/20100527080026/http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/30363/1/95/0953.pdf. |
Number | Date | Country | |
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20140266970 A1 | Sep 2014 | US |