Sensor array noise reduction

1. A logging and control system, comprising:

a sensor array noise reduction manager configured to:

receive measurements from two or more sensors configured to detect an electromagnetic telemetry signal;

convert the measurements into symbols in a constellation domain;

measure a dispersion of the symbols around one or more constellation centers in the constellation domain;

determine a demixing vector based on the dispersion; and

apply the demixing vector to filter one or more noise sources from the measurements and improve a signal to noise ratio of the electromagnetic telemetry signal in the measurements.

2. The system of claim 1 , wherein the two or more sensors comprise electrode sensors.

3. The system of claim 1 , wherein the sensor array noise reduction manager is configured to:

receive the measurements from sensors located at a surface of a wellsite.

4. The system of claim 1 , wherein the sensor array noise reduction manager is configured to:

store the demixing vector in a database;

receive second measurements from two or more other sensors; and

calculate a dispersion metric of the demixing vector received from a database, and apply the demixing vector to filter one or more noise sources from the second measurements when the dispersion metric is below a preset threshold.

5. The system of claim 1 , wherein the sensor array noise reduction manager is configured to calculate the demixing vector iteratively using global search.

6. The system of claim 1 , wherein the sensor array noise reduction manager is configured to calculate the demixing vector iteratively using one or more of:

a sparse decomposition process; or

a brute force process.

7. The system of claim 1 , wherein the sensor array noise reduction manager is configured to reduce a size of a search space by singular value decomposition and polar transformation of the measurements.

8. The system of claim 1 , wherein the sensor array noise reduction manager is configured to filter the one or more noise sources from the measurements simultaneously.

9. The system of claim 1 , wherein the sensor array noise reduction manager is configured to filter up to N−1 noise sources from measurements of N sensors simultaneously.

10. The logging and control system of claim 1 , wherein the logging and control system is configured to determine one or more drilling parameters of a well based on data represented by the measurements.

11. The logging and control system of claim 1 , further comprising:

the two or more sensors configured to detect the electromagnetic signal;

a measuring device positioned in a wellbore; and

a telemetry device in communication with the measuring device, wherein the telemetry device is configured to emit a signal representative of the electromagnetic signal that is received by the two or more sensors.

12. A method for increasing a signal to noise ratio of a received electromagnetic signal, comprising:

receiving, at a sensor interface, measurements associated with an operating condition from two or more sensors, the measurements being included in the received electromagnetic signal;

converting the measurements into symbols in a constellation domain;

measuring a dispersion of the symbols around one or more constellation centers in the constellation domain;

determining a demixing vector based on the dispersion; and

applying the demixing vector to the measurements to remove noise associated with one or more noise sources from the received electromagnetic signal.

13. The method of claim 12 , further comprising querying for an existing demixing vector from a database.

14. The method of claim 12 , determining the demixing vector comprises using one or more of:

a global search process; or

a sparse decomposition process.

15. The method of claim 12 , wherein the demixing vector is determined on the fly.

16. The method of claim 12 , further comprising:

storing the demixing vector in a database;

receiving second measurements from the two or more sensors;

calculating a dispersion metric of the demixing vector received from a database; and

applying the demixing vector to filter one or more noise sources from the second measurements when the dispersion metric is below a preset threshold.

17. The method of claim 12 , further comprising using the measurements to steer a drill in a wellbore after applying the demixing vector.

18. The method of claim 12 , further comprising transmitting measurements from a telemetry device in communication with a measuring device in a wellbore by emitting electromagnetic signals.

19. The method of claim 18 , further comprising detecting the electromagnetic signals using the two or more sensors.

20. A computer-readable tangible medium with instructions stored thereon that, when executed, direct a processor to perform acts comprising:

receiving measurements collected by two or more sensors, the two or more sensors being configured to detect electromagnetic signals;

converting the measurements into symbols in a constellation domain;

measuring a dispersion of the symbols around one or more constellation centers in the constellation domain;

determining a demixing vector based on the dispersion; and

applying the demixing vector to filter one or more noise sources from the electromagnetic signals.

21. The computer-readable medium of claim 20 , wherein determining the demixing vector comprises using one of more of:

a global search; and

a sparse decomposition.

22. The computer-readable medium of claim 20 , wherein the acts further comprise:

storing the demixing vector in a database;

receiving second measurements from the two or more sensors;

calculating a dispersion metric of the demixing vector received from a database; and

applying the demixing vector to filter one or more noise sources from the second measurements when the dispersion metric is below a preset threshold.