System and method for concurrent operation of multiple radar or active sonar systems on a common frequency

• US 7,151,483 B2
• Filed: 02/04/2005
• Issued: 12/19/2006
• Est. Priority Date: 05/03/2004
• Status: Active Grant

• Current Assignee: Raytheon Canada Limited (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Dizaji, Reza M., Ponsford, Anthony M., McKerracher, Richard R.
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US11/051,402
• Publication Number:
  US 20050242985A1
• Time in Patent Office: 683 Days
• Field of Search: 342200-204, 342/21, 342107-116, 342127-137, 342139-141, 342/145, 342/146, 342/194, 342/195
• US Class Current: 342/201
• CPC Class Codes: G01S 13/24 using frequency agility of carrier wave
• CPC Class Codes: G01S 13/284 using coded pulses
• CPC Class Codes: G01S 13/87 Combinations of radar systems, e.g. primary radar and secondary radar
• CPC Class Codes: G01S 7/36 Means for anti-jamming , e.g. ECCM, i.e. electronic counter-counter measures

Abstract

A system and corresponding method for the concurrent operation of multiple radar systems on a common frequency and in the same geographical area includes a waveform generator that specifies certain operating parameters for the transmitted radar pulses. In a first instance, the carrier frequency can include an offset for each radar system. In a second instance, complementary codes can be used for the radar pulses such that each radar system operates with a unique code for substantially reducing the cross-talk between the radar systems. In another instance, both carrier frequency offset and complementary coded waveforms can be used to increase the number of radar systems that operate concurrently. Carrier frequency offset can also be used to combat range-wrap by using different carrier frequencies for adjacent radar pulses.

Claims

1. A waveform generator for a radar system, the waveform generator being adapted to allow the radar system to operate concurrently on a common frequency with at least one other radar system, the waveform generator comprising:

a. a radar parameter unit including;

i) an operating parameters module for generating operating parameters for radar pulses that are transmitted by the radar system; and

,

ii) a carrier frequency parameter module connected to the operating parameters module for generating a carrier frequency at which the radar pulses are transmitted, the carrier frequency including a carrier frequency offset with respect to carrier frequencies used by the at least one other radar system;

b. a signal generator connected to the radar parameter unit for generating the radar pulses in accordance with the operating parameters; and

,

c. a timing unit connected to the signal generator for supplying a pulse trigger signal to the signal generator for generating the radar pulses such that the radar system is synchronized with the at least one other radar system.

2. The waveform generator of claim 1, wherein the carrier frequency offset includes a guard band for ensuring that radar data associated with the radar system is separated from radar data associated with the at least one other radar system.

3. The waveform generator of claim 1, wherein the radar system is a High Frequency Surface Wave Radar, and the carrier frequency offset is at least 10 Hz.

4. The waveform generator of claim 1, wherein the radar parameter unit further includes a code generator module connected to the operating parameters module for providing at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by the at least one other radar system.

5. The waveform generator of claim 4, wherein the complementary codes include Frank codes.

6. A waveform generator for a radar system, the waveform generator being adapted to allow the radar system to operate concurrently on a common frequency with at least one other radar system, the waveform generator comprising:

a. a radar parameter unit including;

i) an operating parameters module for generating operating parameters for radar pulses that are transmitted by the radar system; and

,

ii) a code generator module connected to the operating parameters module for providing at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by the at least one other radar system;

b. a signal generator connected to the radar parameter unit for generating the radar pulses in accordance with the operating parameters; and

,

c. a timing unit connected to the signal generator for supplying a pulse trigger signal to the signal generator for generating the radar pulses such that the radar system is synchronized with the at least one other radar system.

7. The waveform generator of claim 6, wherein the complementary codes include Frank codes.

8. The waveform generator of claim 6, wherein the radar parameter unit further includes a carrier frequency parameter module connected to the operating parameters module for generating a carrier frequency at which the radar pulses are transmitted, the carrier frequency including a carrier frequency offset with respect to carrier frequencies used by the at least one other radar system.

9. The waveform generator of claim 8, wherein the carrier frequency offset includes a guard band for ensuring that radar data associated with the radar system is separated from radar data associated with the at least one other radar system.

10. The waveform generator of claim 8, wherein the radar system is a High Frequency Surface Wave Radar, and the carrier frequency offset is at least 10 Hz.

11. A waveform generator for a radar system, the waveform generator being adapted to allow the radar system to operate concurrently on a common frequency with at least one other radar system, the waveform generator comprising:

a. a radar parameter unit including;

i) an operating parameters module for generating operating parameters for radar pulses that are transmitted by the radar system;

ii) a carrier frequency parameter module connected to the operating parameters module for generating a carrier frequency at which the radar pulses are transmitted, the carrier frequency including a carrier frequency offset with respect to carrier frequencies used by the at least one other radar system; and

,

iii) a code generator module connected to the operating parameters module for providing at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by the at least one other radar system;

b. a signal generator connected to the radar parameter unit for generating the radar pulses in accordance with the operating parameters; and

,

c. a timing unit connected to the signal generator for supplying a pulse trigger signal to the signal generator for generating the radar pulses such that the radar system is synchronized with the at least one other radar system.

12. The waveform generator of claim 11, wherein the carrier frequency offset includes a guard band for ensuring that radar data associated with the radar system is separated from radar data associated with the at least one other radar system.

13. The waveform generator of claim 11, wherein the radar system is a High Frequency Surface Wave Radar, and the carrier frequency offset is at least 10 Hz.

14. The waveform generator of claim 11, wherein the complementary codes include Frank codes.

15. A waveform generator for a radar system, the waveform generator being adapted to combat range wrap, the waveform generator comprising:

a. a radar parameter unit including;

i) an operating parameters module for generating operating parameters for radar pulses that are transmitted by the radar system; and

,

ii) a carrier frequency parameter module connected to the operating parameters module for generating a set of carrier frequencies at which the radar pulses are transmitted, the set of carrier frequencies including unique carrier frequencies each having a carrier frequency offset with respect to one another;

b. a signal generator connected to the radar parameter unit for generating radar pulses in accordance with the operating parameters with adjacent radar pulses being given a unique carrier frequency from the set of carrier frequencies; and

,

c. a timing unit connected to the signal generator for supplying a pulse trigger signal to the signal generator for generating the radar pulses.

16. The waveform generator of claim 15, wherein the carrier frequency offsets used for the set of carrier frequencies include a guard band for ensuring that radar data associated with one radar pulse is separated from radar data associated with an adjacent radar pulse.

17. The waveform generator of claim 15, wherein the radar system is a High Frequency Surface Wave Radar, and the carrier frequency offset is at least 10 Hz.

18. The waveform generator of claim 15, wherein the radar parameter unit further includes a code generator module connected to the operating parameters module for providing at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by at least one other radar system thereby allowing for concurrent operation of the radar systems on a common frequency.

19. The waveform generator of claim 18, wherein the complementary codes include Frank codes.

20. The waveform generator of claim 18, wherein the complementary codes include Barker codes.

21. A method for generating radar pulses for a radar system for allowing the radar system to operate concurrently with at least one other radar system on a common frequency, the method comprising:

a. generating operating parameters for radar pulses that are transmitted by the radar system, the operating parameters including a carrier frequency at which the radar pulses are transmitted, the carrier frequency including a carrier frequency offset with respect to carrier frequencies used by the at least one other radar system;

b) generating a pulse trigger signal for synchronizing the radar system with the at least one other radar system; and

,

c) generating the radar pulses in accordance with the operating parameters and the synchronization provided by the pulse trigger signal.

22. The method of claim 21, wherein generating the carrier frequency offset includes adding a guard band for ensuring that radar data associated with the radar system is separated from radar data associated with the at least one other radar system.

23. The method of claim 21, wherein the method further includes:

d) generating at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by the at least one other radar system.

24. The method of claim 23, wherein the complementary codes include Frank codes.

25. A method for generating radar pulses for a radar system for allowing the radar system to operate concurrently with at least one other radar system on a common frequency, the method comprising:

a. generating operating parameters for radar pulses that are transmitted by the radar system;

b. generating at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by the at least one other radar system;

c. generating a pulse trigger signal for synchronizing the radar system with the at least one other radar system; and

,

d. generating the radar pulses in accordance with the operating parameters and the synchronization provided by the pulse trigger signal.

26. The method of claim 25, wherein the complementary codes include Frank codes.

27. The method of claim 25, wherein the operating parameters include a carrier frequency at which the radar pulses are transmitted, and the method further includes generating the carrier frequency with a carrier frequency offset with respect to carrier frequencies used by the at least one other radar system.

28. The method of claim 27, wherein generating the carrier frequency offset includes adding a guard band for ensuring that radar data associated with the radar system is separated from radar data associated with the at least one other radar system.

29. A method for generating radar pulses for a radar system for allowing the radar system to operate concurrently with at least one other radar system on a common frequency, the method comprising:

a. generating operating parameters for radar pulses that are transmitted by the radar system, the operating parameters including a carrier frequency at which the radar pulses are transmitted, the carrier frequency including a carrier frequency offset with respect to carrier frequencies used by the at least one other radar system;

b. generating at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by the at least one other radar system;

c. generating a pulse trigger signal for synchronizing the radar system with the at least one other radar system; and

,

d. generating the radar pulses in accordance with the operating parameters and the synchronization provided by the pulse trigger signal.

30. The method of claim 29, wherein generating the carrier frequency offset includes adding a guard band for ensuring that radar data associated with the radar system is separated from radar data associated with the at least one other radar system.

31. The method of claim 29, wherein the complementary codes include Frank codes.

32. A method of generating radar pulses for a radar system, the radar pulses being adapted to combat range wrap, the method comprising:

a. generating operating parameters for the radar pulses that are transmitted by the radar system, the operating parameters including a set of carrier frequencies at which the radar pulses are transmitted, the set of carrier frequencies including unique carrier frequencies each having a carrier frequency offset with respect to one another, with adjacent radar pulses being given a unique carrier frequency from the set of carrier frequencies;

b. generating a pulse trigger signal for synchronizing the radar system with the at least one other radar system; and

,

c. generating the radar pulses in accordance with the operating parameters and the synchronization provided by the pulse trigger signal.

33. The method of claim 32, wherein the method includes generating the carrier frequency offsets with a guard band for ensuring that radar data associated with one radar pulse is separated from radar data associated with an adjacent radar pulse.

34. The method of claim 32, wherein the method further includes providing at least one complementary code that is used to generate the radar pulses, the at least one complementary code being orthogonal to complementary codes used by at least one other radar system thereby allowing for concurrent operation of the radar systems on a common frequency.

35. The method of claim 34, wherein the complementary codes include at least one of Frank codes and Barker codes.