Systems and methods for dynamically compensating signal propagation for flexible radar antennas

• US 7,460,067 B2
• Filed: 12/06/2004
• Issued: 12/02/2008
• Est. Priority Date: 12/06/2004
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Allen, Edward H., Reagor, Mary P., Reagor, Fred L.
• Primary Examiner(s): Gregory; Bernarr E
• Application Number:
  US11/005,164
• Publication Number:
  US 20060119503A1
• Time in Patent Office: 1,457 Days
• Field of Search: 342165-175, 342/195, 342368-377, 342/42, 342/43, 342 51- 55, 342/73, 342/74, 342/81, 342/358, 342/359, 342/766, 342/360, 343/894, 343/907, 343/912, 343/915
• US Class Current: 342/368
• CPC Class Codes: G01S 7/4017 of HF systems
• CPC Class Codes: H01Q 19/10 using reflecting surfaces
• CPC Class Codes: H01Q 19/12 wherein the surfaces are concave H01Q19/18 takes precedence

Abstract

A system for dynamically compensating signal propagation for flexible radar antennas receives measurement signals indicating the position of selected locations of an antenna array. The future shape of the antenna array at a future time is predicted, and compensation signals are applied to signals generated or received by the antenna elements. The compensation signals are based on the future shape of the antenna array.

Claims

1. A system comprising:

a computer program on computer readable medium operable to;

receive measurement signals indicating the position of selected locations of an antenna array;

predict the future shape of the antenna array at a future time; and

apply compensation signals at that future time to signals generated or received by at least one antenna element, wherein the compensation signals are based on the future shape of the antenna array; and

a computer processor operable to execute the computer program.

2. The system of claim 1, further comprising:

a sensor system operable to provide information that is used to determine the current shape of the antenna.

3. The system of claim 2, further comprising:

antenna measurement computer program on computer readable medium operable to receive the information from the sensor system and determine the current shape of the antenna array.

4. The system of claim 2, wherein the sensor system is a free space laser measurement system.

5. The system of claim 4, further comprising:

a receiver configured to detect laser beams reflected from one or more targets.

6. The system of claim 1, wherein the computer program operable to predict the shape of the antenna array at a future time includes:

a table of coefficients; and

an antenna model operable to determine the predicted shape of the antenna array based on the coefficients and the current shape of the antenna array.

7. The system of claim 1, wherein the computer program operable to predict the shape of the antenna array at a future time includes:

information including a plurality of input values and one or more output values corresponding to the input values; and

the computer program is further operable to;

learn the behavior of the antenna array based on the input and output values;

generate coefficients for a model of each output value; and

generate computer executable logic operable to predict the shape of the antenna array at the future time.

8. The system of claim 1, wherein the compensation signals correct phase shift errors in the signals generated and received by the antenna array.

9. The system of claim 1, wherein the compensation signals correct time delay errors in the signals generated and received by the antenna array.

10. The system of claim 1, further comprising the antenna array.

11. The system of claim 10, further comprising the antenna array, wherein the antenna array includes thermo-photovoltaic (TPV) material operable to radiate the signals when the TPV material is excited by an energy beam.

12. The system of claim 11, wherein the antenna array forms at least a portion of structure for a device.

13. The system of claim 12, wherein the device is an airborne device.

14. The system of claim 10, further comprising a RADAR system coupled to the antenna array.

15. A method comprising:

predicting the shape of a flexible antenna array at a future time based on the current shape of the antenna array and output from computer-executable logic instructions that model the behavior of the antenna array; and

generating compensation signals configured to correct signals to be generated by the antenna array at the future time, wherein the compensation signals are based on the predicted shape of the antenna array.

16. The method as set forth in claim 15, wherein predicting the shape of the antenna array is further based on a set of coefficients that are used in the model of the antenna array.

17. The method as set forth in claim 16, further comprising:

utilizing a plurality of input values and one or more output values corresponding to the input values to learn the behavior of the antenna array; and

updating the coefficients based on the learned behavior of the antenna array.

18. The method as set forth in claim 15, wherein the antenna array comprises TPV material and the antenna array generates the signals when the TPV material is excited by an energy beam.

19. The method as set forth in claim 15, wherein the signals include RADAR signals.

20. The method as set forth in claim 15, further comprising:

predicting the shape of a flexible antenna array at a future time based on external forces acting on the antenna array.

21. The method as set forth in claim 15, further comprising:

predicting the shape of a flexible antenna array at a future time based on the temperature of the antenna array.

22. An apparatus comprising:

means for predicting the shape of a flexible antenna array at a future time based on the current shape of the antenna array and output from a model of the antenna array; and

means for generating compensation signals configured to correct signals to be generated by the antenna array at the future time, wherein the compensation signals are based on the predicted shape of the antenna array.