Enhanced sonde recognition
First Claim
1. A detector for detecting an oscillating magnetic signal produced by a sonde, the magnetic signal having a fundamental frequency and harmonic frequencies, the detector comprising a frequency spectrum analyser having frequency bins and an output, wherein the frequency bins of the frequency spectrum analyser are substantially aligned with the fundamental frequency and a plurality of the harmonic frequencies of the magnetic signal produced by the sonde.
1 Assignment
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Accused Products
Abstract
A detector for locating a sonde is comprised of a plurality of antennas, a corresponding number of signal isolator modules 1 and a geometrical evaluation module. The magnetic signal generated by the sonde has a fundamental frequency and harmonic frequencies. A frequency spectrum analyser 29 which forms part of the signal isolator module 1 has frequency bins which are aligned with the fundamental frequency and a plurality of harmonic frequencies of the magnetic signal produced by the sonde. The frequency bins follow variations in the frequency of the magnetic signal produced by the sonde which allows the detector to detect the sonde at a separation of up to 30 m.
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Citations
35 Claims
- 1. A detector for detecting an oscillating magnetic signal produced by a sonde, the magnetic signal having a fundamental frequency and harmonic frequencies, the detector comprising a frequency spectrum analyser having frequency bins and an output, wherein the frequency bins of the frequency spectrum analyser are substantially aligned with the fundamental frequency and a plurality of the harmonic frequencies of the magnetic signal produced by the sonde.
- 12. A method of detecting an oscillating magnetic signal produced by a sonde, the magnetic signal having a fundamental frequency and harmonic frequencies, the method comprising analysing the frequency spectrum of the magnetic signal with a frequency spectrum analyser having frequency bins and an output, wherein the frequency bins of the frequency spectrum analyser are substantially aligned with the fundamentalfrequency and a plurality of the harmonic frequencies of the magnetic signal produced by the sonde.
- 23. A computer program for detecting an oscillating magnetic signal produced by a sonde, the magnetic signal having a fundamental frequency and harmonic frequencies, the computer program comprising analysing the frequency spectrum of the magnetic signal induced in an antenna with frequency spectrum analysis having frequency bins and an output, wherein the frequency bins of the frequency spectrum analysis are substantially aligned with the fundamental frequency and a plurality of the harmonic frequencies of the magnetic signal produced by the sonde.
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34. (canceled)
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35. (canceled)
Specification