System and method for modulating filter coefficients in a channelizer

Patent metadata

Field	Value
Publication number	US-10320596-B2
Application number	US-201715721467-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Circuit and method for modulating filter coefficients of a frequency channelizer having a filter bank include: receiving a wide spectrum input signal; modulating the filter coefficients of the filter bank to sweep a center frequency of each channel of the frequency channelizer, using a modulation scheme; and inputting frequency offset compensation caused by the modulation, and output signals of the frequency channelizer to an application processing circuit to convert the output signals to their original center frequencies.

First claim

What is claimed is:

1. A method for modulating filter coefficients of a frequency channelizer including a filter bank, the method comprising:
receiving a wide spectrum input signal;
modulating the filter coefficients of the filter bank to sweep a center frequency of each channel of the frequency channelizer, using a modulation scheme; and
inputting frequency offset compensation caused by the modulation, and output signals of the frequency channelizer to an application processing circuit to convert the output signals to their original center frequencies, wherein the modulation scheme is a linear frequency modulation, a non-linear frequency modulations, a modulation according to a pseudo-random but known pattern, or a user defined sequence.

2. The method of claim 1 , further comprising updating the modulation scheme, based on the output signals of the frequency channelizer.

3. The method of claim 2 , further comprising selecting the filter coefficients of the filter bank, based on the output signals of the frequency channelizer.

4. The method of claim 2 , wherein updating the modulation scheme is based on amplitude levels of the signals being detected at the output of the frequency channelizer.

5. The method of claim 3 , wherein selecting the filter coefficients of the filter bank is based on amplitude levels of the output signals being detected at the output of the frequency channelizer.

6. The method of claim 1 , further comprising down-sampling the output signals of the frequency channelizer before inputting to the application processing circuit.

7. The method of claim 1 , further comprising processing the converted output signals for one or more of radar applications, electronic warfare applications, communications applications, and video processing applications.

8. The method of claim 1 , further comprising performing one or more of pulse compression, Doppler processing, and spectral sharing on the converted output signals.

9. The method of claim 1 , wherein the modulation scheme is a random modulation.

10. A circuit for modulating filter coefficients of a frequency channelizer including a filter bank comprising:
an input port for receiving a wide spectrum input signal;
a modulation generation circuit for modulating the filter coefficients of the filter bank to sweep a center frequency of each channel of the frequency channelizer, using a modulation scheme;
an application processing circuit for converting output signals of the frequency channelizer to their original center frequencies responsive to frequency offset compensation caused by the modulation generation circuit; and
a down-sampler for downs-sampling the output signals of the frequency channelizer before being input to the application processing circuit.

11. The circuit of claim 10 , further comprising a decision update circuit for updating the modulation scheme and selecting the filter coefficients of the filter bank, based on the output signals of the frequency channelizer.

12. The circuit of claim 11 , wherein the decision update circuit updates the modulation scheme and selects the filter coefficients based on amplitude levels of the signals being detected at the output of the frequency channelizer.

13. The circuit of claim 10 , wherein the application processing circuit processes the converted output signals for one or more of radar applications, electronic warfare applications, communications applications, and video processing applications.

14. The circuit of claim 10 , wherein the application processing circuit performs one or more of pulse compression, Doppler processing, and spectral sharing on the converted output signals.

15. The circuit of claim 10 , further comprising a decision update circuit for updating the modulation scheme and selecting the filter coefficients of the filter bank, based on the output signals of each channel of the frequency channelizer.

16. A frequency channelizer comprising:
an input port for receiving a wide spectrum input signal;
a filter bank including a plurality of filter coefficients;
a modulation generation circuit for modulating the filter coefficients of the filter bank to sweep a center frequency of each channel of the frequency channelizer, using a modulation scheme;
an application processing circuit for converting output signals of each channel of the frequency channelizer to their original center frequencies responsive to frequency offset compensations caused by the modulation generation circuit; and
a decision update circuit for updating the modulation scheme and selecting the filter coefficients of the filter bank, based on the output signals of each channel of the frequency channelizer.

17. The frequency channelizer of claim 16 , wherein the modulation scheme is a linear frequency modulation, a non-linear frequency modulations, a modulation according to a pseudo-random but known pattern, or a user defined sequence.

18. The frequency channelizer of claim 16 , further comprising a down-sampler for downs-sampling the output signals of the frequency channelizer before being input to the application processing circuit.

19. The frequency channelizer of claim 16 , wherein the decision update circuit updates the modulation scheme and selects the filter coefficients based on amplitude levels of the signals being detected at the output of the frequency channelizer.

20. The frequency channelizer of claim 16 , wherein the application processing circuit processes the converted output signals for one or more of radar applications, electronic warfare applications, communications applications, and video processing applications.

Assignees

• Raytheon Co

Inventors

• Thompson Daniel
• Marr Harry B

Classifications

• H04B10/25073

  using spectral equalisation, e.g. spectral filtering · CPC title

• H04B3/14

  characterised by the equalising network used · CPC title

• H04L27/122 Primary

  using digital generation of carrier signals (digital function generators G06F1/02, H04L17/10; generating pulses having stepped portions using digital techniques H03K4/026) · CPC title

• H04B3/148

  variable equalisers · CPC title

• H04B7/005

  Control of transmission; Equalising · CPC title