Applications for low profile two-way satellite antenna system

• US 7,911,400 B2
• Filed: 12/29/2006
• Issued: 03/22/2011
• Est. Priority Date: 01/07/2004
• Status: Expired due to Fees

• Current Assignee: Gilat Satellite Networks Limited
• Original Assignee: Raysat Antenna Systems, LLC (Gilat Satellite Networks Limited)
• Inventors: Moshe, Bercovich, Spirtus, Danny, Gachev, Mario Ganchev, Kaplan, Ilan
• Primary Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US11/647,576
• Publication Number:
  US 20080018545A1
• Time in Patent Office: 1,544 Days
• Field of Search: 343711-713
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/125 Means for positioning
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 21/061 Two dimensional planar arrays
• CPC Class Codes: H01Q 3/08 for varying two co-ordinates of the orientation
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence

Abstract

Antenna and satellite communications assemblies and associated satellite tracking systems that may include a low profile two-way antenna arrangement, tracking systems, and applications thereof. Applications for the system include military, civilian, and domestic emergency response applications. The antenna arrangements may be configured to form a spatial multi-element array able to track a satellite in an elevation plane by electronically dynamically targeting the antenna arrangement and/or mechanically dynamically rotating the antenna arrangements about transverse axes giving rise to generation of respective elevation angles and dynamically changing the respective distances between the axes whilst maintaining a predefined relationship between said distances and the respective elevation angles. The system provides autonomous dynamic tracking of satellite signals and can be used for satellite communications on moving vehicles in a variety of frequency bands for military and civilian applications.

Claims

1. A system for communication, comprising:

a low profile, two-way vehicle-mounted satellite antenna;

a plurality of tracking sensors including a received signal strength indicator circuit, one or more gyroscopes, an inclinometer and a global positioning system receiver;

an electromechanical polarizer having a mechanically rotatable input probe set in a circular waveguide; and

a processor, configured to receive input from the tracking sensors and use the input to autonomously acquire, and maintain beam angle tracking of, a satellite while a vehicle on which the antenna is mounted is in motion, and to track linear polarization orientation of a linearly polarized satellite signal by rotating the electromechanical polarizer'"'"'s input probe.

2. The system according to claim 1 wherein the system is configured to operate in the X-band, Ku-band, Ka-band, or Q-band.

3. The system of claim 1, wherein the antenna is further configured to carry signals for a group video conference with multiple additional parties while the vehicle is in motion.

4. The system of claim 1, wherein the system is further configured to provide position reporting to a central command.

5. The system of claim 1, wherein the processor is further configured to use an input from the one or more gyroscopes to maintain a satellite track in the event of a signal interruption with a tracked satellite.

6. The system of claim 1, wherein the processor is further configured to use an input from the one or more gyroscopes to determine and compensate for a tracking error with a tracked satellite.

7. The system of claim 1, further comprising a wi-fi wireless interface, and further configured to use the wireless interface to establish a wireless communication network in the vicinity of the vehicle.

8. The system of claim 7, further configured to use the wireless interface and wireless communication network to relay information between a satellite and one or more wireless devices in the vehicle'"'"'s vicinity.

9. The system of claim 1, further comprising a cellular telephone network interface, configured to wirelessly communicate with one or more mobile wireless cellular telephones.

10. The system of claim 1, further comprising a short range land mobile radio, configured to relay information between a satellite and one or more other short range land mobile radios.

11. The system of claim 1, further configured to relay surveillance information between a surveillance system and a command center via satellite.

12. The system of claim 1, further configured to relay information between a first responder unit and a command center via satellite.

13. The system of claim 1, said polarizer'"'"'s waveguide further comprising:

two orthogonal output probes connected to horizontal and vertical antenna ports to provide output signals whose polarization orientation is determined by the rotation angle of the input probe.

14. The system of claim 1, further configured to use forward error correction rate coding of ⅓

or less in order to minimize emissions to satellites adjacent to a target satellite.

15. The system of claim 1, further configured to switch operation between L-band and either X-band or Ku-band.

16. An apparatus comprising:

a low profile, two-way, vehicle-mounted, Ku-band antenna;

an electromechanical polarizer having a rotatable input probe; and

a processor, configured to;

terminate antenna transmissions within predefined exclusion zones based on global positioning system (GPS) data identifying a location of the antenna; and

autonomously acquire and track linear polarization orientation of a linearly polarized satellite signal while the vehicle is in motion through rotation of the polarizer input probe.

17. The apparatus of claim 16, wherein processor is further configured to identify a predefined exclusion zone based on time of day.

18. The apparatus of claim 16, wherein the processor is configured to perform the termination automatically.