Granted Patent B1

US 11,792,762 · App. 18/201,295 · Granted Oct 17, 2023

Inventors: Ronald C. Dzierwa (Baltimore, MD); Daniel Carbajal (Severna Park, MD); David William Kleinbeck (Lees Summit, MO)

Assignee: DIGITAL GLOBAL SYSTEMS, INC.

H04W64/00H04B17/23H04B17/26H04B17/318H04B17/373H04L27/0006H04L27/0012H04L27/265H04W16/14

Abstract

Claims (43)

1. A method for signal detection and/or interference detection in an electromagnetic environment, comprising:

learning the electromagnetic environment, 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;

scrubbing a spectral sweep against the knowledge map;

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;

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

locating the at least one signal using a monitoring array;

identifying the at least one signal by a static database;

wherein the static database includes hardware parameters, environment parameters, and terrain data to calculate a threshold bar to identify signals instead of noise;

synthesizing an aperture between any two monitoring units of the monitoring array based on a difference of time of arrival.

2. The method of claim 1 , 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 detected at a particular level.

3. The method of claim 1 , further comprising creating a profile of the electromagnetic environment based on the knowledge map, wherein the profile comprises a highest power level at each frequency.

4. The method of claim 1 , further comprising automatically fine-tuning a threshold of a power level on a segmented basis while extracting at least one temporal feature from the knowledge map.

5. 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.

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

7. The method of claim 1 , wherein locating the at least one signal using a monitoring array further comprises:

at least three monitoring units scanning independently for the at least one signal;

at least one of the at least three monitoring units acquiring and measuring the at least one signal;

the at least one of the at least three monitoring units transmitting a formatted message to other units within the monitoring array; and

the at least one of the at least three monitoring units processing measurements of the at least one signal and determining a location of a signal emitting device from which the at least one signal is emitted;

wherein the formatted message comprises center frequency, bandwidth, modulation schema, average power, and phase lock loop time adjustment from the at least one of the at least three monitoring units.

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

9. The method of claim 1 , further comprising determining exact locations of units of the monitoring array and a timing of signal processing based on Global Positioning System (GPS) information received by a GPS receiver.

10. The method of claim 1 , wherein the environment parameters includes rain, fog, and haze based on a delta correction factor table and a provided precipitation rate.

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

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

a monitoring array; and

a remote device in network-based communication with the at least one apparatus;

wherein the at least one apparatus is operable to sweep and learn the electromagnetic environment, 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 at least one apparatus is operable to scrub a spectral sweep against the knowledge map;

wherein the at least one apparatus is operable to smooth the spectral sweep;

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

wherein the at least one apparatus is operable to use a frequency-locked loop to determine if a signal is moving;

wherein the frequency locked loop is operable to determine if there is a Doppler change in at the least one signal;

wherein the at least one apparatus is operable to use a static database to identify signals;

wherein the static database includes hardware parameters, environment parameters, and terrain data to calculate a threshold bar to identify signals instead of noise;

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 an aperture is synthesized between any two monitoring units of the monitoring array based on a difference of time of arrival; and

wherein the knowledge map and/or detecting results are displayed on the remote device in real time.

Assignments (3)

Continuity (23)