Granted Patent B2

US 11,558,764 · App. 17/388,822 · Granted Jan 17, 2023

Inventors: Daniel Carbajal (Severna Park, MD); Ronald C. Dzierwa (Baltimore, MD)

Assignee: DIGITAL GLOBAL SYSTEMS, INC.

H04W24/08H04L27/00H04L27/0006H04W16/14H04W64/006H04W72/0453H04W76/11H04W24/02

Abstract

Claims (54)

1. A method for automatic signal detection in an electromagnetic environment, comprising:

learning the electromagnetic environment in a learning period based on statistical learning techniques, thereby creating learning data including power level measurements of the electromagnetic environment;

forming a knowledge map of the electromagnetic environment based on the power level measurements of the electromagnetic environment, wherein the knowledge map comprises an array of normal distributions, wherein each normal distribution corresponds to how often a power level at each frequency has been at a particular level;

creating a profile of the electromagnetic environment based on the knowledge map, wherein the profile comprises a highest power level for each frequency detected during the learning period;

scrubbing a spectral sweep against the profile;

calculating a first derivative of the power level measurements and a second derivative of the power level measurements;

smoothing the spectral sweep with a correction vector, wherein the correction vector is determined according to the spectral sweep;

detecting at least one signal in the electromagnetic environment based on matched positive and negative gradients;

averaging the spectral sweep, removing areas identified by the matched positive and negative gradients, and connecting points between removed areas to determine a baseline; and

subtracting the baseline from the spectral sweep to reveal the at least one signal;

wherein the detecting the at least one signal in the RF environment comprises automatically fine-tuning a threshold of power level on a segmented basis while extracting at least one temporal feature from the knowledge map.

2. The method of claim 1 , further comprising indexing the power level measurements for each frequency interval in a spectrum section in the learning period.

3. The method of claim 1 , further comprising displaying the knowledge map and/or detecting results in real time on a remote device.

4. The method of claim 1 , wherein frequency resolution of the knowledge map is based on a Fast Fourier Transform (FFT) size setting.

5. The method of claim 1 , further comprising periodically reevaluating the electromagnetic environment and updating the knowledge map.

6. The method of claim 1 , wherein the learning period is a predetermined period of time or a period of time required to reach a settled percent.

7. The method of claim 1 , further comprising sending a notification and/or an alarm to at least one remote device after detecting the at least one signal.

8. The method of claim 1 , wherein one or more of the at least one signal is a narrowband signal hidden in a wideband signal.

9. A system for automatic signal detection in an electromagnetic environment, comprising:

at least one apparatus for detecting signals in the electromagnetic environment;

wherein the at least one apparatus is operable to sweep and learn the electromagnetic environment in a learning period based on statistical learning techniques, thereby creating learning data including power level measurements of the electromagnetic environment;

wherein the at least one apparatus is operable to form a knowledge map based on the power level measurements of the electromagnetic environment, wherein the knowledge map comprises an array of normal distributions, wherein each normal distribution corresponds to how often a power level at each frequency has been at a particular level;

wherein the at least one apparatus is operable to create a profile of the electromagnetic environment based on the knowledge map, wherein the profile comprises a highest power level for each frequency detected during the learning period;

wherein the at least one apparatus is operable to scrub a spectral sweep against the profile;

wherein the at least one apparatus is operable to calculate a first derivative of the power level measurements and a second derivative of the power level measurements;

wherein the at least one apparatus is operable to smooth the spectral sweep with a correction vector, wherein the correction vector is determined according to the spectral sweep;

wherein the at least one apparatus is operable to detect at least one signal in the electromagnetic environment based on matched positive and negative gradients;

wherein the at least one apparatus is operable to average the spectral sweep, remove areas identified by the matched positive and negative gradients, and connect points between removed areas to determine a baseline;

wherein the at least one apparatus is operable to subtract the baseline from the spectral sweep to reveal the at least one signal; and

wherein the at least one apparatus is operable to automatically fine-tune a threshold of power level on a segmented basis while extracting at least one temporal feature from the knowledge map.

10. The system of claim 9 , wherein the at least one apparatus is operable to index the power level measurements for each frequency interval in a spectrum section in the learning period.

11. The system of claim 9 , further comprising a remote device in network-based communication with the at least one apparatus, wherein the knowledge map and/or detecting results are displayed on a remote device in real time.

12. The system of claim 9 , wherein frequency resolution of the knowledge map is based on a Fast Fourier Transform (FFT) size setting.

13. The system of claim 9 , wherein the at least one apparatus periodically reevaluates the electromagnetic environment and updates the knowledge map.

14. The system of claim 9 , wherein the learning period is a predetermined period of time or a period of time required to reach a settled percent.

15. The system of claim 9 , wherein one or more of the at least one apparatus includes a global positioning system (GPS) receiver.

16. The system of claim 9 , wherein the at least one apparatus is operable to obtain a different knowledge map by communicating with another apparatus.

17. The system of claim 9 , wherein one or more of the at least one signal is a narrowband signal hidden in a wideband signal.

18. A system for automatic signal detection in an electromagnetic environment, comprising:

at least one apparatus for detecting signals in the electromagnetic environment; and

at least remote device;

wherein the at least one apparatus is operable to sweep and learn the electromagnetic environment in a learning period based on statistical learning techniques, thereby creating learning data including power level measurements of the electromagnetic environment;

wherein the at least one apparatus is operable to form a knowledge map based on the power level measurements of the electromagnetic environment, wherein the knowledge map comprises an array of normal distributions, wherein each normal distribution corresponds to how often a power level at each frequency has been at a particular level;

wherein the at least one apparatus is operable to create a profile of the electromagnetic environment based on the knowledge map, wherein the profile comprises a highest power level for each frequency detected during the learning period;

wherein the at least one apparatus is operable to scrub a spectral sweep against the profile;

wherein the at least one apparatus is operable to calculate a first derivative of the power level measurements and a second derivative of the power level measurements;

wherein the at least one apparatus is operable to smooth the spectral sweep with a correction vector, wherein the correction vector is determined according to the spectral sweep;

wherein the at least one apparatus is operable to detect at least one signal in the electromagnetic environment based on matched positive and negative gradients;

wherein the at least one apparatus is operable to average the spectral sweep, remove areas identified by the matched positive and negative gradients, and connect points between removed areas to determine a baseline;

wherein the at least one apparatus is operable to subtract the baseline from the spectral sweep to reveal the at least one signal;

wherein the at least one apparatus is operable to send a notification and/or an alarm to the at least one remote device after detecting the at least one signal; and

wherein the at least one apparatus is operable to automatically fine-tune a threshold of power level on a segmented basis while extracting at least one temporal feature from the knowledge map.

19. The system of claim 18 , wherein the at least one apparatus is operable to index the power level measurements for each frequency interval in a spectrum section in the learning period.

20. The system of claim 18 , wherein one or more of the at least one signal is a narrowband signal hidden in a wideband signal.

Assignments (2)

Continuity (17)