Programmable apparatus for synthesized filter notch

Patent metadata

Field	Value
Publication number	US-10317514-B2
Application number	US-201514823462-A
Country	US
Kind code	B2
Filing date	Aug 11, 2015
Priority date	Aug 11, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Generally discussed herein are systems, apparatuses, and methods for generating a replica of a first signal with a notch at one or more desired frequencies. In an example, an apparatus can include a pulse cataloger configured to analyze the first signal and to provide phase modulation information about the first signal, a direct digital synthesizer having an output and configured to modulate a second signal using the phase modulation information and to provide the second signal at the output. The second signal can include a representation of the first signal with a frequency notch at a particular center frequency within the bandwidth of the second signal.

First claim

What is claimed is:

1. A signal processor configured to receive first signal information about a first signal, the signal processor comprising:
a pulse cataloger configured to analyze the first signal information and to provide phase modulation information about the first signal;
a direct digital synthesizer having an output and configured to provide a phase-modulated, second signal using the phase modulation information and to provide the phase-modulated, second signal at the output; and
wherein the phase-modulated, second signal includes a representation of the first signal with a frequency notch at a particular center frequency within the bandwidth of the phase-modulated, second signal.

2. The signal processor of claim 1 , including a channelizer configured to divide the first signal information into a plurality of sub-channels, and to provide sub-channel information to the pulse cataloger.

3. The signal processor of claim 2 , where in the phase modulation includes sub-channel phase modulation information.

4. The signal processor of claim 3 , including a combiner configured to combine the sub-channel modulation information to provide second signal phase modulation information.

5. The signal processor of claim 4 , wherein the combiner is configured to analyze the sub-channel phase modulation information for phase modulation characteristics that span multiple sub-channels and to supplement the second signal phase modulation with multi-channel phase modulation information associated with the phase modulation characteristics.

6. The signal processor of claim 5 , wherein the direct digital phase modulation circuit includes a comparator circuit configured to receive the second signal phase modulation information.

7. The signal processor of claim 6 , wherein the comparator circuit is configured to derive frequency information of second signal phase modulation information and adjust phase transitions of the second signal phase modulation information if a frequency of the frequency information is within the frequency notch.

8. The signal processor of claim 4 , wherein the first information includes information related to multiple signals received at an antenna coupled to the signal processor;
wherein the multiple signals include a target signal and one or more ambient signals;
wherein the signal processor includes a modulation filter configured to receive an output of the combiner and to remove modulation information related to the one or more ambient signals.

9. The signal processor of claim 1 , wherein the phase modulation information includes a first parameter indicative of pulse width of a pulse of the first signal information.

10. The signal processor of claim 1 , wherein the phase modulation information includes a first parameter indicative of a reception time of a pulse of the first signal information.

11. The signal processor of claim 1 , wherein the phase modulation information includes a first parameter indicative of a center frequency the first signal information.

12. The signal processor of claim 1 , wherein the phase modulation information includes a first parameter indicative of an initial phase value the first signal information.

13. The signal processor of claim 1 , wherein the phase modulation information includes a first parameter indicative of an amplitude of the first signal information.

14. The signal processor of claim 1 , wherein the phase modulation information includes inter-pulse modulation information of the first signal information.

15. A method comprising:
receiving a first signal at a signal processor:
generating phase modulation information about the first signal at a pulse cataloger of the signal processor;
phase modulating a second signal using a direct digital synthesizer (DDS) and the phase modulation information to provide a phase-modulated, second signal,
providing the phase-modulated, second signal at an output of the direct digital synthesizer; and
wherein the phase-modulated, second signal includes a representation of the first signal with a frequency notch at a particular center frequency within the bandwidth of the second signal.

16. The method of claim 15 , wherein the phase modulation includes receiving the phase modulation information at a comparator circuit of the DDS and comparing the phase modulation information to one or more thresholds related to the frequency notch.

17. The method of claim 16 , wherein the modulating includes modifying a phase transition of the second signal when the phase modulation information of the first signal fails to satisfy the one or more thresholds.

18. The method of claim 17 , wherein the modifying includes suppressing a phase transition of the second signal when the phase modulation information of the first signal fails to satisfy the one or more thresholds.

19. A non-transitory computer readable storage device including instructions, which when executed by a machine, configure the machine to:
receive a first signal having a first bandwidth:
generate phase modulation information about the first signal;
phase modulate a second signal using a direct digital synthesizer (DDS) and the phase modulation information to provide a phase-modulated, second signal;
provide the phase-modulated, second signal at an output of the direct digital synthesizer;
wherein a bandwidth of the phase-modulated, second signal is commensurate with the first bandwidth, and
wherein the phase-modulated, second signal includes a representation of the first signal with a frequency notch at a particular center frequency within the bandwidth of the second signal.

20. The non-transitory computer readable storage device of claim 19 , when executed by a machine, configure the machine to:
receive the phase modulation information and compare the phase modulation information to one or more thresholds related to the frequency notch;
modify a phase transition of the second signal when the phase modulation information of the first signal fails to satisfy the one or more thresholds; and
suppress a phase transition of the second signal when the phase modulation information of the first signal fails to satisfy the one or more thresholds.

Assignees

• Raytheon Co

Inventors

• Mclean Chris S
• Marr Jr Harry B
• Hsu Ray T

Classifications

• H04K3/42

  characterized by the control of the jamming frequency or wavelength · CPC title

• H04K3/28

  with jamming and anti-jamming mechanisms both included in a same device or system, e.g. wherein anti-jamming includes prevention of undesired self-jamming resulting from jamming · CPC title

• G01S13/26

  wherein the transmitted pulses use a frequency- or phase-modulated carrier wave · CPC title

• G01S7/38 Primary

  Jamming means, e.g. producing false echoes · CPC title

• G01S7/282

  Transmitters · CPC title