Method of and system for locating a single passive underground electronic marker type that distinguishes false indication caused by other marker types
First Claim
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1. A method of locating a selected type of passive electronic marker;
- said method comprising;
transmitting a signal at a frequency associated with a selected type of passive electronic marker;
receiving a signal from a marker; and
determining a frequency distribution of the received signal.
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Abstract
A method of and system for locating a single passive underground marker type may distinguish false indications caused by other marker types. In accordance with aspects of the present invention, minimization or elimination of false marker indications may be accomplished by processing the response from a marker to determine which frequency has the largest response.
16 Citations
13 Claims
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1. A method of locating a selected type of passive electronic marker;
- said method comprising;
transmitting a signal at a frequency associated with a selected type of passive electronic marker;
receiving a signal from a marker; and
determining a frequency distribution of the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- said method comprising;
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8. A system for locating a selected type of passive electronic marker;
- said system comprising;
a transmitter for transmitting a signal at a frequency associated with a selected type of passive electronic marker;
a receiver for receiving a signal from a marker; and
,a processor coupled to the receiver for determining a frequency distribution of the received signal. - View Dependent Claims (9, 10, 11, 12, 13)
- said system comprising;
Specification