Generating a time deterministic, spectrally noncoherent signal

• US 8,358,240 B2
• Filed: 07/13/2007
• Issued: 01/22/2013
• Est. Priority Date: 07/13/2007
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Brock, Eddie R.
• Primary Examiner(s): GALT, CASSI J
• Application Number:
  US11/777,759
• Publication Number:
  US 20090016410A1
• Time in Patent Office: 2,020 Days
• Field of Search: 342202-204, 342134-144, 342/195, 342/13, 342/14
• US Class Current: 342/202
• CPC Class Codes: G01S 7/38 Jamming means, e.g. producing false echoes
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence
• CPC Class Codes: H04B 1/7174 Pulse generation in general H04L25/03834
• CPC Class Codes: H04L 25/03834 using pulse shaping

Abstract

According to one embodiment, a system for generating a signal includes a monocycle generator, one or more temporal modulators, and a pulse shaper. The monocycle generator generates monocycles that form a signal comprising pulses, where a pulse corresponds to one or more monocycles. The temporal modulators provide instructions the monocycle generator to create a specific spectral response in the signal. A pulse shaper individually modulates at least one monocycle of the monocycles corresponding to a pulse to shape the pulse.

Claims

1. A system for generating a signal, comprising:

a monocycle generator configured to generate a plurality of monocycles, each monocycle comprising a single cycle of a sinusoidal waveform, the plurality of monocycles forming a signal comprising a plurality of pulses, a pulse of the plurality of pulses corresponding to one or more monocycles of the plurality of monocycles;

one or more temporal modulators coupled to the monocycle generator and configured to provide instructions the monocycle generator, the instructions comprising a control signal to instruct the monocycle generator to create a noncoherent spectral response in the signal; and

a pulse shaper coupled to the monocycle generator, the pulse shaper configured to receive the plurality of pulses generated by the monocycle generator and perform the following for each pulse of the plurality of pulses;

individually modulate at least one monocycle of the one or more monocycles corresponding to the each pulse to shape the each pulse;

an information modulator coupled between the monocycle generator and the pulse shaper configured modulate the signal for encoding information content into the signal; and

a controller coupled to the information modulator configured to control peak and average power for creating interference between a transmitter and a receiver, wherein the average power is derived from the peak power and a duty cycle, the peak power is derived from amplitude, and the duty cycle is determined by a pulse width and a pulse repetition interval.

2. The system of claim 1, wherein the one or more temporal modulators comprises:

a numerical code generator configured to provide a numerical code to yield a noncoherent spectral response in the signal.

3. The system of claim 1, wherein the one or more temporal modulators comprises:

a pulse repetition interval generator configured to provide a control signal to trigger generation of the plurality of monocycles.

4. The system of claim 1, wherein the pulse shaper is configured to individually modulate the at least one monocycle by:

dividing the signal to separate the one or more monocycles; and

modulating the at least one monocycle individually of the other monocycles of the one or more monocycles.

5. The system of claim 1, wherein the pulse shaper is configured to individually modulate the at least one monocycle by:

attenuating an amplitude of the at least one monocycle.

6. The system of claim 1, wherein the signal is time deterministic.

7. The system of claim 1, wherein the signal has a frequency greater than 30 gigahertz.

17. The system of claim 1, wherein the noncoherent spectral response is generated using fast Fourier transforms.

8. A method for generating a signal, comprising:

generating a plurality of monocycles using a monocycle generator, each monocycle comprising a single cycle of a sinusoidal waveform, the plurality of monocycles forming a signal comprising a plurality of pulses, a pulse of the plurality of pulses corresponding to one or more monocycles of the plurality of monocycles;

providing instructions comprising a control signal to create a noncoherent spectral response in the signal; and

performing the following for each pulse of the plurality of pulses received from the monocycle generator;

individually modulating at least one monocycle of the one or more monocycles corresponding to the each pulse to shape the each pulse;

providing an information modulator coupled between the monocycle generator and the pulse shaper; and

providing a controller coupled to the information modulator to control peak and average power for creating interference between a transmitter and a receiver, wherein the average is derived from the peak power and a duty cycle, the peak power is derived from amplitude, and the duty cycle, is determined by a pulse width and a pulse repetition interval.

9. The method of claim 8, further comprising:

modulating the signal to encode information content into the signal.

10. The method of claim 8, wherein providing instructions to create the noncoherent spectral response in the signal comprises:

providing a numerical code to yield a noncoherent spectral response in the signal.

11. The method of claim 8, wherein the control signal is configured to trigger generation of the plurality monocycles.

12. The method of claim 8, wherein individually modulating the at least one monocycle of the one or more monocycles further comprises:

dividing the signal to separate the one or more monocycles; and

modulating the at least one monocycle individually of the other monocycles of the one or more monocycles.

13. The method of claim 8, wherein individually modulating the at least one monocycle of the one or more monocycles further comprises:

attenuating an amplitude of the at least one monocycle.

14. The method of claim 8, wherein the signal is time deterministic.

15. The method of claim 8, wherein the signal has a frequency greater than 30 gigahertz.

18. The method of claim 8, wherein the noncoherent spectral response is generated using fast Fourier transforms.

16. A system for generating a signal, comprising:

a monocycle generator configured to generate a plurality of monocycles, each monocycle comprising a single cycle of a sinusoidal waveform, the plurality of monocycles forming a signal comprising a plurality of pulses, a pulse of the plurality of pulses corresponding to one or more monocycles of the plurality of monocycles;

one or more temporal modulators coupled to the monocycle generator and configured to provide instructions to the monocycle generator, the instructions comprising a control signal to instruct the monocycle generator to create a noncoherent spectral response in the signal, the one or more temporal modulators comprising;

a numerical code generator configured to provide a numerical code to yield a noncoherent spectral response in the signal; and

a pulse repetition interval generator configured to provide the control signal to trigger generation of the plurality of monocycles;

an information modulator coupled to the monocycle generator and configured to modulate the signal to encode information content into the signal; and

a pulse shaper coupled to the monocycle generator, the pulse shaper configured to receive the plurality of pulses generated by the monocycle generator and perform the following for each pulse of the plurality of pulses;

individually modulate at least one monocycle of the one or more monocycles corresponding to the each pulse to shape the each pulse by;

dividing the signal to separate the one or more monocycles; and

modulating the at least one monocycle individually of the other monocycles of the one or more monocycles by attenuating an amplitude of the at least one monocycle, the signal being time deterministic, the signal having a frequency greater than 30 gigahertz.