Aviation cellular communications system and method

• US 8,428,580 B1
• Filed: 06/30/2010
• Issued: 04/23/2013
• Est. Priority Date: 06/30/2010
• Status: Active Grant

• Current Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Mitchell, James P., Zogg, Scott J.
• Primary Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US12/827,632
• Time in Patent Office: 1,028 Days
• Field of Search: 455/12.1, 455/13.3, 455/13.4, 455/19, 4551271-1273, 4551931-1932, 455/194.2, 455/341, 455/418, 455/420, 455427-431, 455/434, 4554561-4563, 4554565-4566, 455/457, 455/517, 455/520, 455522-524, 455/550.1, 455/552.1, 455/556.2, 455/557, 455560-561, 455/11.1, 455 15- 16, 455/25, 330/254, 330/278
• US Class Current: 455/431
• CPC Class Codes: H04B 7/18506 Communications with or from aircraft, i.e. aeronautical mobile service
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/022 with dynamic range variability
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

Disclosed are a system and method for controlling transmit power of a mobile node in air-to-ground communications to a fixed node. Power is controlled by taking into consideration the position of the mobile node, the ground position of a plurality of fixed nodes, and the RF pattern of an antenna. Preferably, a power level is selected that will excite the fewest number of the plurality of fixed nodes while still maintaining a stable connection with at least one of the fixed nodes. The system may also utilize a repeater to receive communication signals from one or more mobile phones. This repeater then pre-amplifies the signal with a gain control signal received from one of the plurality of fixed nodes. The repeater would then pass the pre-amplified signal to the power amplifier for further amplification as controlled by the power controller.

Claims

1. A system for controlling transmit power of a mobile node in air-to-ground communications to a plurality of fixed nodes, the system comprising:

a first position determination unit configured to determine a position of the mobile node;

a second position determination unit configured to determine ground position information for the plurality of fixed nodes;

a power amplifier configured to amplify a power of a communications signal from one or more communication devices;

an antenna coupled to the power amplifier, the antenna being configured to produce a radio frequency (RF) pattern when energized by the power amplifier; and

a power controller coupled to the power amplifier, wherein the power controller is configured to control the power level of the power amplifier according to the position of the mobile node, the ground position information of the plurality of fixed nodes, and the RF pattern.

2. The system of claim 1, wherein the power controller is further configured to determine the power level that will cause the RF pattern to excite the fewest number of the plurality of fixed nodes while still maintaining a stable connection with at least one of the plurality of fixed nodes.

3. The system of claim 1, wherein the mobile node is located in or upon a vehicle, and wherein the power controller is further configured to determine the power level according to a heading of the vehicle.

4. The system of claim 1, wherein the mobile node is located in or upon an aircraft, and wherein the power controller is further configured to determine the power level according to at least one of a pitch, roll, and yaw of the aircraft.

5. The system of claim 1, wherein the first position determination unit includes a Global Positioning System (GPS) unit.

6. The system of claim 3, wherein the first position determination unit includes an Inertial Navigation System (INS) which provides the heading to the power controller.

7. The system of claim 1, wherein the first position determination unit determines the position of the mobile node by detecting signals from one or more transmitters with known locations and determining the position of the mobile node from the known locations of the one or more transmitters from which the signals were detected.

8. The system of claim 1, wherein the second position determination unit is a database that stores the ground position information.

9. The system of claim 1, wherein the antenna is an exterior mounted antenna.

10. The system of claim 1, wherein the antenna includes multiple antennas arranged and phased as an array.

11. The system of claim 1, wherein the antenna is a steerable antenna.

12. The system of claim 11, wherein the power controller is further configured to determine the power level according to a gain achieved by steering the steerable antenna toward at least one of the plurality of fixed nodes.

13. The system of claim 1, wherein the first position determination unit, the second position determination unit, the power amplifier, the antenna, and the power controller are housed within or affixed upon an aircraft.

14. The system of claim 1, wherein the antenna is configured such that the RF pattern has a directional envelope that is substantially null directly underneath the antenna.

15. A method for controlling transmit power of a mobile node in air-to-ground communications to a plurality of fixed nodes, the mobile node including an antenna coupled to a power amplifier, the antenna being configured to produce a radio frequency (RF) pattern when energized by the power amplifier, the method comprising the steps of:

determining a position of the mobile node;

determining ground position information for the plurality of fixed nodes at a different location than the mobile node; and

calculating a power level of the power amplifier utilizing the position of the mobile node, the ground position information of the plurality of fixed nodes, and the RF pattern.

16. The method of claim 15, wherein the calculating step further calculates the power level that will cause the RF pattern to excite the fewest number of the plurality of fixed nodes while still maintaining a stable connection with at least one of the plurality of fixed nodes.

17. The method of claim 15, wherein the mobile node is located in or upon a vehicle, and wherein the calculating step further calculates the power level according to a heading of the vehicle.