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A system for and method of determining and compensating for the effect of a field influencing object on a field sensor, preferably a coil, that is within a navigational domain. The navigational domain contains navigational magnetic energy and disturbing magnetic energy, and the field influencing obj

A system for and method of determining and compensating for the effect of a field influencing object on a field sensor, preferably a coil, that is within a navigational domain. The navigational domain contains navigational magnetic energy and disturbing magnetic energy, and the field influencing object produces the disturbing magnetic energy in response to the navigational magnetic energy. The correction system includes a first transmitter for projecting into the navigational domain field energy in a first waveform sufficient to induce a first signal value in the sensing coil. The system also includes a second transmitter for projecting into the navigational domain field energy in a second waveform sufficient to induce a second signal value in the sensing coil. The system further includes a signal processor for receiving the first signal value and for receiving the second signal value to determine the effect of the electrically conductive object on the field senior. In other embodiments, the correction system may utilize a second sensing coil to receive and process an alternate aspect of the field energy from a position that is different from the first field sensor, or the system may utilize a storage device that contains information relating to the effect of the field influencing device within the navigational domain.

대표청구항 ▼

1. A correction system for determining an effect of at least one interfering object on a field sensor within a navigational domain, the system comprising:a first transmitter configured to project, into said navigational domain, field energy in a first waveform at a first frequency sufficient to indu

1. A correction system for determining an effect of at least one interfering object on a field sensor within a navigational domain, the system comprising:a first transmitter configured to project, into said navigational domain, field energy in a first waveform at a first frequency sufficient to induce a first desired signal value in said field sensor from said first transmitter and a first disturbance signal value in said field sensor from said at least one interfering object; a second transmitter configured to project, into said navigational domain, field energy in a second waveform at a second frequency sufficient to induce a second desired signal value in said field sensor from said second transmitter and a second disturbance signal value in said field sensor from said at least one interfering object; and, a signal processor configured to receive said first desired and disturbance signal values and said second desired and disturbance signal values and to determine influences of said at least one interfering object on said field sensor from said first and second disturbance signal values, to thereby permit a substantially precise location of said field sensor to be determined despite the presence of said at least one interfering object.