Method For Detection Of Signal Source Using Estimation Of Noise Statistics
First Claim
1. A method for analyzing signals transmitted from a below ground transmitter, the method comprising the steps of:
- obtaining a noise measurement at an above ground location when no signal is transmitted from a below ground transmitter, the noise measurement having a magnitude;
transmitting an electromagnetic signal from the transmitter;
detecting the electromagnetic signal at the above ground location, the detected signal having a magnitude with a noise free component; and
estimating the noise free component of the detected signal by removing the noise measurement magnitude from the detected signal magnitude.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for noise signal analysis and communication with an underground transmitter. The method comprises the steps of measuring a noise floor when no signal is transmitted from a transmitter, detecting a signal when the transmitter is transmitting, and estimating the noise free component of the signal by removing the noise floor measurement. The measurement of the noise floor and detecting the signal from the transmitter may be done using a root mean square technique. The noise floor measurement can be removed from the measured signal by subtracting the noise floor measurement from the measured signal or alternatively by calculating the square root of the difference between the square of the measured signal and the square of the noise floor measurement. The noise estimation technique may be used in connection with, a differential phased shift keying communication scheme or other modulation techniques.
-
Citations
19 Claims
-
1. A method for analyzing signals transmitted from a below ground transmitter, the method comprising the steps of:
-
obtaining a noise measurement at an above ground location when no signal is transmitted from a below ground transmitter, the noise measurement having a magnitude; transmitting an electromagnetic signal from the transmitter; detecting the electromagnetic signal at the above ground location, the detected signal having a magnitude with a noise free component; and estimating the noise free component of the detected signal by removing the noise measurement magnitude from the detected signal magnitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for analyzing signals transmitted from a below ground transmitter, the method comprising the steps of:
-
obtaining a noise measurement at an above ground location when no signal is transmitted from a below ground transmitter, the noise measurement having a magnitude; transmitting an electromagnetic signal from the transmitter; modulating information representing an operational parameter of the transmitter onto the electromagnetic signal; detecting the electromagnetic signal at the above ground location, the detected signal having a magnitude and a noise free component; estimating the noise free component of the detected signal by removing the noise measurement magnitude from the detected signal magnitude; and determining a location of the transmitter, a depth of the transmitter, or flux angles using the noise free component of the signal. - View Dependent Claims (17, 18, 19)
-
Specification