Method for detecting a working area and device therefor
First Claim
1. A method for detecting a position with respect to a defined area comprising:
- providing a current signal in a boundary conductor, which surrounds the defined area, according to a boundary signal which has been provided, the boundary signal corresponding to a pseudo-random signal;
receiving a detection signal from a magnetic field generated by the current signal in the boundary conductor;
generating a reconstructed boundary signal from the detection signal;
providing a reference signal having a bit pattern corresponding to the boundary signal which has been provided;
identifying a maximum magnitude correlation in a plurality of correlations between the reference signal and the reconstructed boundary signal, each correlation in the plurality of correlations being performed with one temporal offset in a plurality of temporal offsets between the reference signal and the reconstructed boundary signal; and
determining a position inside of the defined area in response to the maximum magnitude correlation being a positive value that is greater than a predetermined positive correlation threshold or another position outside of the defined area in response to the maximum magnitude correlation being a negative value that is less than a predetermined negative correlation threshold.
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Accused Products
Abstract
A method for detecting a position with respect to a mobile working machine includes providing a current signal in a boundary conductor, which surrounds the defined area, in accordance with a boundary signal that is provided, the boundary signal corresponding to a pseudo-accident signal; and receiving a detection signal of a magnetic field. The method further includes generating a reconstructed boundary signal from the detection signal; providing a reference signal which has a bit pattern corresponding to the boundary signal provided; carrying out a correlation method in order to determine a time-based correlation offset between the reference signal and the reconstructed boundary signal and a correlation value between the reference signal and the reconstructed boundary signal, which are displaced in relation to each other by the correlation offset determined; and determining a position inside or outside the defined area as a function of the correlation value determined.
7 Citations
12 Claims
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1. A method for detecting a position with respect to a defined area comprising:
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providing a current signal in a boundary conductor, which surrounds the defined area, according to a boundary signal which has been provided, the boundary signal corresponding to a pseudo-random signal; receiving a detection signal from a magnetic field generated by the current signal in the boundary conductor; generating a reconstructed boundary signal from the detection signal; providing a reference signal having a bit pattern corresponding to the boundary signal which has been provided; identifying a maximum magnitude correlation in a plurality of correlations between the reference signal and the reconstructed boundary signal, each correlation in the plurality of correlations being performed with one temporal offset in a plurality of temporal offsets between the reference signal and the reconstructed boundary signal; and determining a position inside of the defined area in response to the maximum magnitude correlation being a positive value that is greater than a predetermined positive correlation threshold or another position outside of the defined area in response to the maximum magnitude correlation being a negative value that is less than a predetermined negative correlation threshold.
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2. A method for detecting a position with respect to an area defined by an alternating magnetic field, comprising:
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receiving a detection signal which corresponds to a voltage induced by the alternating magnetic field; generating a reconstructed boundary signal from the detection signal; providing a reference signal, the reconstructed boundary signal and the reference signal corresponding to a pseudo-random signal; identifying a maximum magnitude correlation in a plurality of correlations between the reference signal and the reconstructed boundary signal, each correlation in the plurality of correlations being performed with one temporal offset in a plurality of temporal offsets between the reference signal and the reconstructed boundary signal; and determining a position inside of the area in response to the maximum magnitude correlation being a positive value that is greater than a predetermined positive correlation threshold or outside of the area in response to the maximum magnitude correlation being a negative value that is less than a predetermined negative correlation threshold. - View Dependent Claims (3, 4, 5, 6)
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7. A device, comprising:
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a detector unit configured to receive a detection signal from a magnetic field generated by the current signal in a boundary conductor; a reference signal generator configured to provide a reference signal which has a bit pattern corresponding to the boundary signal which has been provided; and an evaluation unit which is configured (i) to generate a reconstructed boundary signal from the detection signal, to identify a maximum magnitude correlation in a plurality of correlations between the reference signal and the reconstructed boundary signal, each correlation in the plurality of correlations being performed with one temporal offset in a plurality of temporal offsets between the reference signal and the reconstructed boundary signal; and to determine a position inside of an area defined by the boundary conductor in response to the maximum magnitude correlation being a positive value that is greater than a predetermined positive correlation threshold or outside the area in response to the maximum magnitude correlation being a negative value that is less than a predetermined negative correlation threshold. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification