Radar system using RF noise

• US 20060012513A1
• Filed: 03/08/2005
• Published: 01/19/2006
• Est. Priority Date: 01/31/2003
• Status: Active Grant

• Current Assignee: Ohio State Innovation Foundation (Ohio State University)
• Original Assignee: Ohio State University
• Inventors: Walton, Eric K.
• Granted Patent: US 7,196,657 B2
• Time in Patent Office: Days
• US Class Current: 342/195
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 13/284 using coded pulses
• CPC Class Codes: G01S 13/346 using noise modulation
• CPC Class Codes: G01S 13/89 for mapping or imaging
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 2013/0281 LPI, Low Probability of Intercept radar
• CPC Class Codes: G01S 2013/9329 cooperating with reflectors or transponders
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/0235 Avoidance by time multiplex
• CPC Class Codes: G01S 7/35 Details of non-pulse systems
• CPC Class Codes: H01Q 13/085 Slot-line radiating ends
• CPC Class Codes: H01Q 19/08 for modifying the radiation pattern of a radiating horn in which it is located corrugated horns H01Q13/0208; producing a circular polarisation H01Q13/0241

Abstract

A radar system that utilizes predetermined, pseudorandom, or random waveforms that may be substantially matched to the impulse response of the radar and any surrounding clutter such that the signal-to-clutter ratio may be optimized and/or such that specific targets may be identified and/or classified.

Claims

1. A radar system comprising:

a memory device adapted to provide a first signal and a second signal; and

a mixer adapted to mix said second signal with a signal that is derived from said first signal interacting with a target.

2. The radar system of claim 1 wherein said memory device is a sequential memory device.

3. The radar system of claim 2 wherein said memory device is a first-in/first-out circuit (FIFO).

4. The radar system of claim 1 wherein said first signal has a bandwidth greater than about 100 MHz.

5. The radar system of claim 1 wherein said first signal has a bandwidth greater than about 300 MHz.

6. The radar system of claim 1 wherein said first signal has a bandwidth greater than about 500 MHz.

7. The radar system of claim 1 wherein said first signal has a bandwidth greater than about 800 MHz.

8. The radar system of claim 1 wherein a divider circuit is adapted to provide said signal that is derived from said first signal interacting with the target.

9. The radar system of claim 1 wherein said memory device is adapted to provide at least one additional output, said radar system further comprising:

at least one additional mixer such that each additional mixer is adapted to mix a respective additional output of said memory device with a respective signal that is derived from said first signal interacting with the target.

10. The radar system of claim 9 wherein a divider circuit is adapted to provide said signals that are derived from said first signal interacting with the target.

11. A radar system comprising:

a memory device adapted to provide multiple outputs such that a first signal is produced from at least one of said outputs and a second signal is produced from at least one of said outputs; and

a mixer adapted to mix said second signal with a signal that is derived from said first signal interacting with a target.

12. The radar system of claim 11 wherein said first signal is equivalent to one of said outputs of said memory device.

13. The radar system of claim 11 wherein said first signal is produced from a plurality of said outputs of said memory device.

14. The radar system of claim 13 wherein a digital-to-analog (D/A) converter is adapted to provide said first signal.

15. The radar system of claim 11 wherein said second signal is equivalent to one of said outputs of said memory device.

16. The radar system of claim 11 wherein said second signal is produced from a plurality of said outputs of said memory device.

17. The radar system of claim 16 wherein a digital-to-analog (D/A) converter is adapted to provide said second signal.

18. The radar system of claim 11 wherein:

said first signal is produced from a plurality of said outputs of said memory device; and

said second signal is produced from a plurality of said outputs of said memory device.

19. The radar system of claim 11 wherein said memory device is a sequential memory device.

20. The radar system of claim 19 wherein said memory device is a first-in/first-out circuit (FIFO).

21. The radar system of claim 11 wherein said first signal has a bandwidth greater than about 100 MHz.

22. The radar system of claim 11 wherein said first signal has a bandwidth greater than about 300 MHz.

23. The radar system of claim 11 wherein said first signal has a bandwidth greater than about 500 MHz.

24. The radar system of claim 11 wherein said first signal has a bandwidth greater than about 800 MHz.

25. The radar system of claim 11 wherein a divider circuit is adapted to provide said signal that is derived from said first signal interacting with the target.

26. The radar system of claim 11 wherein at least one additional signal is adapted to be produced from at least one of said outputs of said memory device, said radar system further comprising:

at least one additional mixer such that each additional mixer is adapted to mix a respective additional signal that is produced from at least one of said outputs of said memory device with a respective signal that is derived from said first signal interacting with the target.

27. The radar system of claim 26 wherein a divider circuit is adapted to provide said signals that are derived from said first signal interacting with the target.

28. A radar system adapted to transmit a first signal, said radar system comprising:

a memory device adapted to provide a second signal; and

a mixer adapted to mix said second signal with a signal that is derived from said first signal interacting with a target.

29. The radar system of claim 28 wherein a divider circuit is adapted to provide said signal that is derived from said first signal interacting with the target.

30. The radar system of claim 28 wherein said memory device is adapted to provide at least one additional signal, said radar system further comprising:

at least one additional mixer such that each additional mixer is adapted to mix a respective additional signal of said memory device with a respective signal that is derived from said first signal interacting with the target.

31. The radar system of claim 30 wherein a divider circuit is adapted to provide said signals that are derived from said first signal interacting with the target.

32. A radar system adapted to transmit a first signal, said radar system comprising:

a memory device adapted to provide multiple outputs such that a second signal is produced from said outputs; and

a mixer adapted to mix said second signal with a signal that is derived from said first signal interacting with a target.

33. The radar system of claim 32 wherein a divider circuit is adapted to provide said signal that is derived from said first signal interacting with the target.

34. The radar system of claim 32 wherein said memory device is adapted to provide additional outputs such that at least one additional signal is produced from said additional outputs, said radar system further comprising:

at least one additional mixer such that each additional mixer is adapted to mix a respective additional signal that is produced from said additional outputs of said memory device with a respective signal that is derived from said first signal interacting with the target.

35. The radar system of claim 34 wherein a divider circuit is adapted to provide said signals that are derived from said first signal interacting with the target.