Determining a position of objects in a predetermined coordinate system
First Claim
1. A method for determining the location and/or orientation of an object in a predetermined coordinate system, in which method in the object there is arranged a set of signal sources in a known manner in relation to the co-ordinate system of the object, the method comprising:
- transmitting a predetermined signal from the signal sources, receiving the signal transmitted from the signal sources with a receiver which comprises signal receivers, computing the location and/or orientation of the object based on received amplitudes of the signals, determining the amplitudes of the received signals, said amplitudes being independent of each other, by computationally taking into account the correlation between the transmitted signals, said transmitted signals being transmitted simultaneously and having arbitrary waveforms, determining each signal source separately from the independent amplitudes, and computing the location and/or orientation of the object at the time interval being examined based on the independent amplitude distributions associated with the signal sources by adjusting numerical amplitudes of the signal sources to the received amplitudes measured using the receiver, said adjusting the numerical amplitudes performed by setting the geometrical free parameters of the signal sources and/or of the receiver to values by which the difference between the calculated and measured amplitude distributions is at its smallest.
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Abstract
The invention relates to a method and device by means of which the location and position of an object may be determined in relation to another object by electromagnetic signals. In the arrangement in accordance with the invention there are two objects to the one of which there are attached signal sources, i.e. transmitters that generate electromagnetic signals, and the other object contains one or more receivers for measuring the transmitter signals. Usually the object containing transmitters is the one whose location or position is of interest and which is the object of the measurement. For example, in MEG measurements the object associated with the transmitters is the head of a human being on whose surface the transmitters are placed. By means of the arrangement in accordance with the invention is possible to find out the location and position of the head, in which case the location of the signals generated by the brain may be found out and utilized when examining the brain activity. The transmitters are also used to measure the signals emanating from the brain.
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Citations
15 Claims
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1. A method for determining the location and/or orientation of an object in a predetermined coordinate system, in which method in the object there is arranged a set of signal sources in a known manner in relation to the co-ordinate system of the object, the method comprising:
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transmitting a predetermined signal from the signal sources, receiving the signal transmitted from the signal sources with a receiver which comprises signal receivers, computing the location and/or orientation of the object based on received amplitudes of the signals, determining the amplitudes of the received signals, said amplitudes being independent of each other, by computationally taking into account the correlation between the transmitted signals, said transmitted signals being transmitted simultaneously and having arbitrary waveforms, determining each signal source separately from the independent amplitudes, and computing the location and/or orientation of the object at the time interval being examined based on the independent amplitude distributions associated with the signal sources by adjusting numerical amplitudes of the signal sources to the received amplitudes measured using the receiver, said adjusting the numerical amplitudes performed by setting the geometrical free parameters of the signal sources and/or of the receiver to values by which the difference between the calculated and measured amplitude distributions is at its smallest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification