Detecting tonal interference in phase shift keyed signal modulations

Patent metadata

Field	Value
Publication number	US-12562826-B2
Application number	US-202418734387-A
Country	US
Kind code	B2
Filing date	Jun 5, 2024
Priority date	Jun 5, 2024
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A method for detecting tonal interference in phase shift keyed signal modulations includes feeding a phase shift keyed signal with an error signal through a lock loop from a phase lock loop. The lock loop feeds the phase shift keyed signal with an error signal through a lock counter that counts a time for the error signal to measure a voltage below a minimum threshold. An enable signal is sent via the lock counter to the frequency channelizer module when the voltage drops below the minimum threshold. The frequency channelizer module splits a spectral content of the phase shift keyed signal into frequency channels. An output of the frequency channels is sent via the frequency channelizer module to a spectral anomaly processor. An automated test is performed with the spectral anomaly processor for each frequency channel, thereby determining a frequency or phase band of the tonal interference.

First claim

What is claimed is:

1 . A method for detecting tonal interference in phase shift keyed signal modulations, comprising:
feeding a phase shift keyed signal with an error signal through a lock loop from a phase lock loop, wherein the lock loop feeds the phase shift keyed signal with the error signal through a lock counter that counts a time for the error signal to measure a voltage below a minimum threshold; sending an enable signal via the lock counter to a frequency channelizer module when the voltage drops below the minimum threshold, wherein the frequency channelizer module splits a spectral content of the phase shift keyed signal into frequency channels; sending an output of the frequency channels via the frequency channelizer module to a spectral anomaly processor; and performing an automated test with the spectral anomaly processor for each frequency channel, thereby determining a frequency or phase band of the tonal interference.

2 . The method of claim 1 , wherein the lock loop feeds the phase shift keyed signal with the error signal through the lock loop when the phase shift keyed signal is below the minimum threshold.

3 . The method of claim 1 , wherein the lock counter that counts the time for the error signal to measure the frequency or phase below the minimum threshold.

4 . The method of claim 3 , wherein the lock counter resets the time to zero after the error signal measures a frequency or phase below the minimum threshold when a new signal is detected or after the error signal goes above the minimum threshold.

5 . The method of claim 1 , wherein the lock loop includes a settling memory that contains the minimum threshold.

6 . The method of claim 5 , wherein the minimum threshold is a dynamic value or static value.

7 . The method of claim 5 , wherein the lock loop includes a no-lock indicator that sends the enable signal to the frequency channelizer module when the minimum threshold is exceeded by the error signal.

8 . The method of claim 1 , wherein the frequency channelizer module and the spectral anomaly processor are powered on when the enable signal is sent from the lock loop.

9 . The method of claim 6 , wherein the dynamic value is a sample moving average.

10 . The method of claim 1 , wherein the minimum threshold is equal to or greater than a 1% phase, voltage, or frequency error.

11 . The method of claim 1 , wherein the voltage that is measured corresponds to a frequency or phase and the minimum threshold is a frequency or phase error threshold.

12 . The method of claim 1 , wherein the phase shift keyed signal with the error signal is fed through the lock loop when the phase shift keyed signal with the error signal is unable to lock.

13 . The method of claim 1 , wherein one frequency channel has a greater amount of power compared to the other frequency channels, thereby indicating tonal interference.

14 . The method of claim 1 , wherein the spectral anomaly processor automated test includes calculating a fast-moving average, a slow moving-average, or a combination thereof, calculating a moving average difference to create a stream of difference values, and comparing the stream of difference values with the minimum threshold.

15 . The method of claim 1 , wherein the spectral anomaly processor provides an alert to a user interface when the tonal interference voltage is detected.

16 . A tonal interference detector system, comprising:
a lock loop, wherein the lock loop feeds a phase shift keyed signal with an error signal through a lock counter; the lock counter, wherein the lock counter counts a time for the error signal to measure a voltage below a minimum threshold and sends an enable signal to the frequency channelizer module when the voltage drops below the minimum threshold; the frequency channelizer module, wherein a frequency channelizer module splits a spectral content of the phase shift keyed signal into frequency channels and sends an output of the frequency channels to a spectral anomaly processor; and the spectral anomaly processor, wherein the spectral anomaly processor performs an automated test for each frequency channel, thereby determining a frequency or phase band of the tonal interference.

17 . The system of claim 16 , wherein the lock loop feeds the phase shift keyed signal with the error signal through the lock loop when the phase shift keyed signal is below the minimum threshold.

18 . The system of claim 16 , wherein the lock counter that counts the time for the error signal to measure the frequency or phase below the minimum threshold.

19 . The system of claim 18 , wherein the lock counter resets the time to zero after the error signal measures a frequency or phase below the minimum threshold when a new signal is detected or after the error signal goes above the minimum threshold.

20 . The system of claim 16 , wherein the frequency channelizer module and the spectral anomaly processor are powered on when the enable signal is sent from the lock counter.

Assignees

• Naval Information Warfare Center Pacific
• Us Navy

Inventors

• Civerolo Michael
• Thumbiran Akila
• Farrand Chris
• Ward Quentin J

Classifications

• H04L27/18

  Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence) · CPC title

• H04B17/345 Primary

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title