Adaptive channelizer

• US 10,348,338 B2
• Filed: 10/06/2016
• Issued: 07/09/2019
• Est. Priority Date: 10/06/2016
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Marr, Harry B., Rosker, Mark J., Hodiak, Justin, Hansen, Charles T.
• Primary Examiner(s): Jain, Ankur
• Application Number:
  US15/287,356
• Publication Number:
  US 20180102926A1
• Time in Patent Office: 1,006 Days
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/0053 with common antenna for more than one band
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26

Abstract

A signal identification system includes an analog adaptive channelizer having a plurality of channels. Each channel has a channel size defined by a bandwidth and a gain. The system further includes an electronic signal identification (ID) controller in signal communication with the analog adaptive channelizer. The ID controller is configured to determine a dynamic range event that modifies an energy level of an affected channel among the plurality of channels, and output a feedback signal including channel parameters based on the dynamic range event. The analog adaptive channelizer actively adjusts at least one of the bandwidth and the gain of the affected channel based on the feedback to change the channel size of the affected channel.

Claims

1. A signal identification system, comprising:

an analog adaptive channelizer including a plurality of channels, each channel having a channel size defined by a bandwidth and a gain; and

an electronic signal identification (ID) controller in signal communication with the analog adaptive channelizer, the ID controller configured to determine a dynamic range event that modifies an energy level of an affected channel among the plurality of channels and outputs a feedback signal including channel parameters based on the dynamic range event,

wherein the analog adaptive channelizer actively adjusts at least one of the bandwidth and the gain of the affected channel based on the feedback to change the channel size of the affected channel, and

wherein actively adjusting the affected channel includes adjusting channel characteristics of the affected channel such that the high-amplitude signal is isolated in the affected channel thereby reducing the dynamic range of the affected channel, and wherein the dynamic range event includes a channel saturation event, or an under-powered signal event, the channel characteristics including adjusting a bandwidth of the affected channel and adjusting a center of frequency of the affected channel based on the channel parameters indicated by the feedback signal.

2. The signal identification system of claim 1, wherein signal ID controller compares a power level of at least one signal in the affected channel to a power level threshold and identifies the least one signal as a high-amplitude signal when the power level of the at least one signal exceeds the power level threshold.

3. The signal identification system of claim 1, wherein each channel among the plurality of channels includes a digitally controlled oscillator (DCO) unit configured to actively adjust a center of frequency of a respective channel based on the feedback signal.

4. The signal identification system of claim 3, wherein each channel among the plurality of channels includes an adaptive filter is configured to actively adjust a bandwidth of a respective channel based on the feedback signal.

5. The signal identification system of claim 4, wherein the adaptive filter is an adaptive polyphase decimating finite impulse response (FIR) filter array.

6. An adaptive channelizer, comprising:

a plurality of channels having a channel size defined by a bandwidth and a gain, each channel comprising;

a digitally controlled oscillator (DCO) unit configured to generate a local oscillating frequency signal based on a feedback signal that is output in response to a dynamic range event of an affected channel among the plurality of channels, the dynamic range event modifying an energy level of the affected channel;

a mixer in signal communication with the DCO unit, the mixer configured to apply the local oscillating frequency signal to the affected channel thereby adjusting a center of frequency of the affected channel; and

an adaptive filter unit in signal communication with the mixer, the adaptive filter unit configured to actively adjust a bandwidth of the affected channel based on the feedback signal,

wherein the adjusted center of frequency and the adjusted bandwidth changes the size of the affected channel to remove the dynamic range event.

7. The adaptive channelizer of claim 6, wherein the feedback signal includes channel parameters based on the dynamic range event, and the adjustment of the center of frequency and the bandwidth isolates a high-amplitude signal having power level that exceeds a power level threshold such that the dynamic range of the channel is reduced.

8. The adaptive channelizer of claim 7, wherein the adaptive filter is an adaptive polyphase decimating finite impulse response (FIR) filter array.

9. The adaptive channelizer of claim 8, wherein the adaptive polyphase decimating finite impulse response (FIR) filter array comprises:

a plurality of clock units, each clock unit generating a clocked-output having a different clock-rate with respect to one another; and

a plurality of sample and hold (S/H) circuits, each S/H circuit receiving the clocked-output from a respective clock unit such that each S/H circuit is clocked at a different time off-set such that a polyphased RF signal is output from the adaptive polyphase decimating finite impulse response (FIR) filter array.

10. The adaptive channelizer of claim 6, wherein the DCO unit comprises:

a time-to-digital converter (TDC) configured to convert the feedback signal into a digital feedback signal, the feedback signal being a frequency controlled word (FCW);

a digital filter configured to output a filtered digital feedback signal based on the digital signal generated by the TDC;

a DCO that varies the local oscillating frequency signal based on the filtered digital feedback signal to actively adjust the center of frequency of the channel; and

a fractional divider circuit that monitors the local oscillating frequency signal and outputs a local feedback signal to the TDC so as to regulate an operating frequency of the DCO unit.

11. The adaptive channelizer of claim 10, wherein the adaptive channelizer receives the feedback circuit in response to outputting the dynamic range event detection signal.

12. The adaptive channelizer of claim 6, further comprising an energy detection circuit that compares an energy level of the channel to a reference value, and outputs a dynamic range event detection signal in response to the energy level exceeding the reference value, wherein the dynamic range event includes a channel saturation event, or an under-powered signal event.

13. A method of controlling a dynamic range of an adaptive channelizer including a plurality of channels having a channel size defined by a bandwidth and a gain, the method comprising:

determining a dynamic range event that modifies an energy level of an affected channel among the plurality of channels;

outputting a feedback signal including channel parameters based on the dynamic range event; and

actively adjusting the channel size of the affected channel based on the feedback to reduce a dynamic range of the affected channel to the set dynamic range value or below the set dynamic range value,

wherein actively adjusting the affected channel includes adjusting channel characteristics of the affected channel such that the high-amplitude signal is isolated in the affected channel thereby reducing the dynamic range of the affected channel, and wherein the dynamic range event includes a channel saturation event, or an under-powered signal event, the channel characteristics including adjusting a bandwidth of the affected channel and adjusting a center of frequency of the affected channel based on the channel parameters indicated by the feedback signal.

14. The method of claim 13, further comprising comparing a power level of at least one signal in the affected channel to a power level threshold and identifying the least one signal as a high-amplitude signal when the power level of the at least one signal exceeds the power level threshold.

15. The method of claim 13, further comprising applying a tunable local oscillating frequency generated by a digitally controlled oscillator (DCO) unit to the affected channel to actively adjust the center of frequency of a respective channel based on the feedback signal.

16. The method of claim 15, wherein each channel among the plurality of channels includes an adaptive filter that is configured to actively adjust a bandwidth of a respective channel based on the feedback signal.