Adaptive crosspole technique

• US 8,060,007 B2
• Filed: 08/27/2008
• Issued: 11/15/2011
• Est. Priority Date: 08/27/2008
• Status: Active Grant

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Mohr, John A.
• Primary Examiner(s): Maung; Nay A
• Assistant Examiner(s): Tran; Paul P
• Application Number:
  US12/198,977
• Publication Number:
  US 20100056040A1
• Time in Patent Office: 1,175 Days
• Field of Search: 455/1, 455/73, 455/74, 455/77, 455/90.2, 455/90.3, 455/403, 455/422, 455/426, 455/550.1, 455/552.1, 455/555, 455/560, 455/561, 455/575.1, 455/612, 455/615, 342/13, 342/54, 342/72, 342/96, 342/128, 342/195, 342/248, 342/309, 342/322, 385/147, 385/3, 398/20, 398/21, 398/22, 398/23, 398/24, 398/39, 398/85, 398/116, 398/176, 398/182, 398/184, 398/195, 398/1, 398/115, 359/239, 359/276, 359/279, 361/113
• US Class Current: 455/1
• CPC Class Codes: H04K 3/65 using deceptive jamming or spoofing, e.g. transmission of false signals for premature triggering of RCIED, for forced connection or disconnection to/from a network or for generation of dummy target signal
• CPC Class Codes: H04K 3/825 by jamming

Abstract

An RF signal processing device which includes a countermeasure set connected to the processing device. The RF signal processing device shifts an incoming RF signal by ninety degrees and combines the phase shifted RF signal with RF jamming signals from a jammer. The processing device next transmits the RF signal including the RF jamming signals from the jammer.

Claims

1. A radio frequency (RF) signal processing device comprising:

(a) a receiver antenna for receiving a radio frequency signal having vertically polarized radiation and horizontally polarized radiation;

(b) a first radio frequency detector included within said receiver antenna for receiving said radio frequency signal from said receiver antenna and then converting said radio frequency signal to an equivalent first high frequency optical signal;

(c) a first fiber optic cable having one end connected to said first radio frequency detector;

(d) a controller connected to an opposite end of said first fiber optic cable wherein said first fiber optic cable transmits said first high frequency optical signal from said first radio frequency detector to said controller for processing by said controller;

(e) said controller phase shifting said first high frequency optical signal by ninety degrees, and then providing a high frequency electrical signal which includes a ninety degree phase shift;

(f) an RF electrical cable having one end connected to said controller;

(g) a transmitter antenna connected to an opposite end of said RF electrical cable wherein said RF electrical cable transmits said high frequency electrical signal including said ninety degree phase shift from said controller to said transmitter antenna;

(h) a second radio frequency detector included within said transmitter antenna for monitoring said high frequency electrical signal from said controller and then converting said high frequency electrical signal to a second high frequency optical signal which includes amplitude and phase information for said high frequency electrical signal;

(i) a second fiber optic cable having one end connected to said second radio frequency detector and an opposite end connected to said controller wherein said second fiber optic cable transmits said second high frequency optical signal including said amplitude and phase information from said second radio frequency detector to said controller; and

(j) said controller responsive to said second high frequency optical signal, making adjustments to said high frequency electrical signal to insure that there is said ninety degree phase shift between said radio frequency signal received by said receiver antenna and an equivalent radio frequency signal to be transmitted by said transmitter antenna.

2. The RF signal processing device of claim 1 further comprising a power amplifier within said RF electrical cable, said power amplifier providing for output power levels required for the operation of said transmitter antenna.

3. The RF signal processing device of claim 1 wherein second fiber optic cable operates as a feedback loop allowing for instantaneous re-calibration of said equivalent radio frequency signal to be transmitted by said transmitter antenna.

4. The RF signal processing device of claim 1 wherein said receiver antenna includes an adjustable attenuator, said adjustable attenuator allowing a user to adjust and reduce a power level for said radio frequency signal received by said receiver antenna to match a power level for said first radio frequency detector preventing damage to said first radio frequency detector.

5. The RF signal processing device of claim 1 wherein said transmitter antenna includes an adjustable attenuator, said adjustable attenuator allowing a user to adjust and reduce a power level for said equivalent radio frequency signal to be transmitted by said transmitter antenna to match a power level for said second radio frequency detector preventing damage to said second radio frequency detector.

6. The RF signal processing device of claim 1 wherein said controller comprises:

(a) an analog to digital converter having an analog input connected to said first fiber optic cable;

(b) a processor connected to a digital output of said analog to digital converter;

(c) a digital to analog converter having a digital input connected to said processor and an analog output connected to said second fiber optic cable;

(d) a signal/RF amplifier having a pair of digital inputs connected to said processor and a pair of analog outputs; and

(e) a vector modulator circuit having a pair of analog inputs connected to the pair of analog outputs for said signal/RF amplifier, said vector modulator having a pair of analog outputs connected to said transmitter antenna.

7. The RF signal processing device of claim 6 wherein said processor within said controller generates said high frequency electrical signal which includes said ninety degree phase shift.

8. A radio frequency (RF) signal processing device comprising:

(a) a receiver antenna for receiving a radio frequency signal having vertically polarized radiation and horizontally polarized radiation;

(b) a first radio frequency detector included within said receiver antenna for receiving said radio frequency signal from said receiver antenna and then converting said radio frequency signal to an equivalent first high frequency optical signal;

(c) a first fiber optic cable having one end connected to said first radio frequency detector;

(d) a controller connected to an opposite of said first fiber optic cable wherein said first fiber optic cable transmits said first high frequency optical signal from said first radio frequency detector to said controller for processing by said controller;

(e) said controller phase shifting said first high frequency optical signal by ninety degrees, and then providing a high frequency electrical signal which includes a ninety degree phase shift;

(f) an electronic countermeasure set connected to said controller for generating countermeasure signals wherein said controller receives said countermeasure signals from said electronic countermeasure set and then combines said high frequency electrical signal including said ninety degree phase shift with said countermeasure signals;

(g) an RF electrical cable having one end connected to said controller;

(h) a transmitter antenna connected to an opposite end of said RF electrical cable wherein said RF electrical cable transmits said high frequency electrical signal including said ninety degree phase shift and said countermeasure signals from said controller to said transmitter antenna;

(i) a second radio frequency detector included within said transmitter antenna for monitoring said high frequency electrical signal from said controller and then converting said high frequency electrical signal to a second high frequency optical signal which includes amplitude and phase information for said high frequency electrical signal;

(j) a second fiber optic cable having one end connected to said second radio frequency detector and an opposite end connected to said controller wherein said second fiber optic cable transmits said second high frequency optical signal including said amplitude and phase information from said second radio frequency detector to said controller; and

(k) said controller responsive to said second high frequency optical signal, making adjustments to said high frequency electrical signal to insure that there is said ninety degree phase shift between said radio frequency signal received by said receiver antenna and a radio frequency signal to be transmitted by said transmitter antenna, wherein said radio frequency signal to be transmitted by said transmitter antenna includes said countermeasure signals.

9. The RF signal processing device of claim 8 further comprising a power amplifier within said RF electrical cable, said power amplifier providing for output power levels required for the operation of said transmitter antenna.

10. The RF signal processing device of claim 8 wherein second fiber optic cable operates as a feedback loop allowing for instantaneous re-calibration of said radio frequency signal to be transmitted by said transmitter antenna.

11. The RF signal processing device of claim 8 wherein said receiver antenna includes an adjustable attenuator, said adjustable attenuator allowing a user to adjust and reduce a power level for said radio frequency signal received by said receiver antenna to match a power level for said first radio frequency detector preventing damage to said first radio frequency detector.

12. The RF signal processing device of claim 8 wherein said transmitter antenna includes an adjustable attenuator, said adjustable attenuator allowing a user to adjust and reduce a power level for said radio frequency signal to be transmitted by said transmitter antenna to match a power level for said second radio frequency detector preventing damage to said second radio frequency detector.

13. The RF signal processing device of claim 8 wherein said controller comprises:

(a) a first analog to digital converter having an analog input connected to said first fiber optic cable;

(b) a processor connected to a digital output of said analog to digital converter;

(c) a digital to analog converter having a digital input connected to said processor and an analog output connected to said second fiber optic cable;

(d) a signal/RF amplifier having a pair of digital inputs connected to said processor and a pair of analog outputs;

(e) a vector modulator circuit having a pair of analog inputs connected to the pair of analog outputs for said signal/RF amplifier, said vector modulator having a pair of analog outputs connected to said transmitter antenna; and

(f) a second analog to digital converter having an analog input connected to said electronic countermeasure set and a digital output connected to said processor.

14. The RF signal processing device of claim 8 wherein said processor within said controller generates said high frequency electrical signal which includes said ninety degree phase shift and said countermeasure signals received from said electronic countermeasure set.

15. A method for radio frequency (RF) signal processing device comprising the steps of:

(a) receiving a radio frequency signal having vertically polarized radiation and horizontally polarized radiation, wherein said radio frequency antenna is within an electro-magnetic frequency range of 850 MHz to 18 GHz, and a receiver antenna receives said radio frequency signal;

(b) converting said radio frequency signal to an equivalent first high frequency optical signal, wherein a first radio frequency detector converts said radio frequency signal to said equivalent first high frequency optical signal;

(c) providing a first fiber optic cable having one end connected to said first radio frequency detector;

(d) providing a controller connected to an opposite end of said first fiber optic cable;

(e) transmitting said first high frequency optical signal from said first radio frequency detector to said controller through said first fiber optic cable for processing by said controller;

(f) shifting a phase of said first high frequency optical signal by ninety degrees;

(g) generating a high frequency electrical signal which includes a ninety degree phase shift, wherein said controller shifts the phase of said first high frequency optical signal and generates said high frequency electrical signal which includes said ninety degree phase shift;

(h) providing an RF electrical cable having one end connected to said controller;

(i) providing a transmitter antenna connected to an opposite end of said RF electrical cable;

(j) transmitting said high frequency electrical signal including said ninety degree phase shift from said controller to said transmitter antenna, wherein said RF electrical cable transmits said high frequency electrical signal including said ninety degree phase shift from said controller to said transmitter antenna;

(k) converting said high frequency electrical signal to a second high frequency optical signal which includes amplitude and phase information for said high frequency electrical signal, wherein a second radio frequency detector converts said high frequency electrical signal to said second high frequency optical signal;

(l) providing a second fiber optic cable having one end connected to said second radio frequency detector and an opposite end connected to said controller;

(m) transmitting said second high frequency optical signal including said amplitude and phase information from said second radio frequency detector to said controller, wherein said second fiber optic cable transmits said second high frequency optical signal including said amplitude and phase information from said second radio frequency detector to said controller; and

(n) adjusting said high frequency electrical signal to insure that there is said ninety degree phase shift between said radio frequency signal received by said receiver antenna and an equivalent radio frequency signal to be transmitted by said transmitter antenna, wherein said controller responsive to said second high frequency optical signal, adjust said high frequency electrical signal to insure that there is said ninety degree phase shift between said radio frequency signal received by said receiver antenna and said equivalent radio frequency signal to be transmitted by said transmitter antenna.

16. The method of claim 15 further comprising the steps of:

(a) generating countermeasure signals wherein an electronic countermeasure set generates said countermeasure signals;

(b) providing said countermeasure signals to said controller; and

(c) combining said high frequency electrical signal including said ninety degree phase shift with said countermeasure signals, wherein said controller combines said high frequency electrical signal with said countermeasure signals.

17. The method of claim 15 further comprising the step of providing an adjustable attenuator within said receiver antenna wherein said adjustable attenuator allows a user to adjust and reduce a power level for said radio frequency signal received by said receiver antenna to match a power level for said first radio frequency detector preventing damage to said first radio frequency detector.

18. The method of claim 15 further comprising the step of providing an adjustable attenuator within said transmitter antenna wherein said adjustable attenuator allows a user to adjust and reduce a power level for said equivalent radio frequency signal to be transmitted by said transmitter antenna to match a power level for said second radio frequency detector preventing damage to said second radio frequency detector.

19. The method of claim 15 further comprising the step of providing a power amplifier within said RF electrical cable, wherein said power amplifier provides for output power levels required for the operation of said transmitter antenna.

20. The method of claim 15 further comprising the step of provding a feedback loop between said controller and said transmitter antenna which allows for instantaneous re-calibration of said equivalent radio frequency signal to be transmitted by said transmitter antenna, wherein said feedback loop comprises said second fiber optic cable.