Radar system and method of due regard/detect and avoid sensing and weather sensing

• US 9,568,602 B1
• Filed: 09/26/2014
• Issued: 02/14/2017
• Est. Priority Date: 09/26/2014
• Status: Active Grant

• Current Assignee: Rockwell Collins, Inc. (Rtx Corporation)
• Original Assignee: Rockwell Collins, Inc. (Rtx Corporation)
• Inventors: Stadelmann, Scott W., Bishop, Jeffrey B., Carlson, Stephen G., Moore, John R., Wesner, Bryan N., Herting, Brian J.
• Primary Examiner(s): Sotomayor, John B
• Application Number:
  US14/498,539
• Time in Patent Office: 872 Days
• Field of Search: 342/26.R, 342 26 A- 26 D
• US Class Current: 1/1
• CPC Class Codes: G01S 13/87 Combinations of radar systems, e.g. primary radar and secondary radar
• CPC Class Codes: G01S 13/933 of aircraft or spacecraft
• CPC Class Codes: G01S 13/953 mounted on aircraft
• CPC Class Codes: G01S 2013/0254 Active array antenna
• CPC Class Codes: G01S 2013/0272 Multifunction radar
• CPC Class Codes: G01S 7/03 Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
• CPC Class Codes: G01S 7/28 Details of pulse systems
• CPC Class Codes: Y02A 90/10 Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

A radar system and a method can utilize a radar antenna, such as, an active electronically scanned array antenna. The radar system can include a processor configured to scan a volume of space via the radar antenna to detect aircraft threats and to detect weather threats. The processing system can utilize a first pattern to detect the aircraft threats or obstacles and a second pattern to detect the weather threats.

Claims

1. A method of using an airborne radar, the method comprising:

providing a first radar pulse pattern for weather detection simultaneously or near simultaneously at a first elevation and a second elevation using an active electronically scanned antenna array;

receiving first radar returns associated with the first elevation and second radar returns associated with the second elevation using the active electronically scanned antenna array; and

detecting weather using data associated with the first radar returns and the second radar returns, where errors associated with time sample differences are reduced due to the providing by the first radar pulse pattern at the first elevation and the second elevation simultaneously or near simultaneously.

2. The method of claim 1, further comprising:

providing a second radar pulse pattern for due regard/detection and avoid functions using the active electronically scanned antenna array.

3. The method of claim 1, further comprising:

providing the first radar pulse pattern at a third elevation simultaneously or near simultaneously with the providing at the first elevation and the second elevation; and

receiving third radar returns associated with the third elevation.

4. The method of claim 1, wherein ground suppression is achieved using a difference between the first radar returns and the second radar returns.

5. The method of claim 1, wherein the method is performed on an unmanned aircraft.

6. The method of claim 1, further comprising:

operating the active electronically scanned antenna array according to a first positioning algorithm when detecting the weather and according to a second positioning algorithm when detecting other aircraft.

7. The method of claim 2, wherein the first radar pulse pattern is for long range detection.

8. The method of claim 7, wherein the second radar pulse pattern is for shorter range detection with a faster update rate.

9. A radar system coupled to a weather radar antenna, the radar system comprising:

a pulse generation circuit comprising a due regard/detect and avoid pulse generation module and a weather detection pulse generation module; and

a radar receiving circuit comprising a weather detection receive module and due regard/detect and avoid receive module.

10. The radar system of claim 9, wherein the pulse generation circuit is comprised of signal processing hardware configured by the due regard/detect pulse generation and avoid module and the weather detection pulse generation module.

11. The radar system of claim 9, wherein the radar receiving circuit is comprised of signal processing hardware configured by the due regard/detect and avoid receive module and the weather detection receive module.

12. The radar system of claim 9, further comprising:

a radar processing circuit comprising a weather radar processing module configured to receive data from the weather radar receive module and a due regard/detect and avoid processing module configured to receive data from the due regard/detect and avoid receive module.

13. The radar system of claim 12, further comprising:

a beam steering control circuit comprising a weather radar control module and a due regard/detect and avoid control module.

14. The radar of claim 13, further comprising a radar function select circuit for selecting the operation in a first mode using the weather radar control module and in a second mode using the due regard/detect and avoid module.

15. The weather radar system of claim 9, wherein the weather radar antenna is an active electronically scanned array antenna.

16. The radar system of claim 9, wherein the radar antenna is an active electronically scanned array having a single aperture configured to receive signals from the pulse generation circuit and provide signals to the radar receiving circuit.

17. A single aperture active electronically scanned array antenna-based radar system, comprising:

a single aperture active electronically scanned array antenna;

a processor configured to scan a volume of space via the single aperture active electronically scanned array antenna to detect aircraft threats and to detect weather threats, wherein the processor utilizes a first pulse pattern to detect the aircraft threats and a second pulse pattern to detect the weather threats.

18. The single aperture active electronically scanned array antenna-based radar of claim 17, wherein the first pulse pattern is simultaneously or near simultaneously provided at least two elevations, wherein the aircraft detection and weather detection is performed in an interleaved fashion.

19. The single aperture active electronically scanned array antenna-based radar system of claim 17, wherein the processor uses a first antenna beam positioning algorithm for detecting aircraft threats and a second antenna beam positioning algorithm for detecting weather, the first antenna positioning beam algorithm being for a scan having a first azimuth range and a first elevation range, the second antenna beam positioning algorithm being for a scan having a second azimuth range and a second vertical range, the second azimuth range and the second vertical range being greater than the first azimuth range and the first elevation range, respectively.

20. The single aperture active electronically scanned array antenna-based radar system of claim 17, wherein the processor uses longer range detection for the weather threats and shorter range detection for other aircraft, wherein the shorter range detection has a faster update rate.