Process for determining the position of a moving object using magnetic gradientmetric measurements
First Claim
1. A process for determining the position of a moving object comprising:
- acquiring scalar measurements by a set of sensors capable of movement during said process and adapted to transmit their positions at each of a plurality of instants;
estimating a trajectory of the object by a model;
combining the measurements output from each sensor to obtain spatial gradient measurements representative of the vector magnetic disturbance of the moving object;
estimating a vector of parameters characteristic of the model as a function of gradient measurements and as a function of the position of the sensors; and
determining the position of the object as a function of the position of the sensors and the parameters vector;
wherein the sensors are all installed at substantially the same physical location.
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Abstract
A process for determining the position of a moving object, by the following steps: scalar measurements are acquired by a set of sensors all installed on the same site, at a position known at each instant; the trajectory of the object is determined approximately by a model; the measurements output from each sensor are combined to obtain spatial gradient measurements representative of the vector electromagnetic disturbance of the moving object; a vector of parameters characteristic of the model is estimated as a function of gradient measurements and as a function of the position of the sensors; and the position of the object is determined as a function of the position of the sensors and the parameters vector.
93 Citations
18 Claims
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1. A process for determining the position of a moving object comprising:
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acquiring scalar measurements by a set of sensors capable of movement during said process and adapted to transmit their positions at each of a plurality of instants;
estimating a trajectory of the object by a model;
combining the measurements output from each sensor to obtain spatial gradient measurements representative of the vector magnetic disturbance of the moving object;
estimating a vector of parameters characteristic of the model as a function of gradient measurements and as a function of the position of the sensors; and
determining the position of the object as a function of the position of the sensors and the parameters vector;
wherein the sensors are all installed at substantially the same physical location. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10)
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7. A process for determining the position of a moving object comprising:
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acquiring scalar measurements by a set of sensors capable of movement during said process and adapted to transmit their positions at each of a plurality of instants;
estimating a trajectory of the object by a model;
combining the measurements output from each sensor to obtain spatial gradient measurements representative of the vector magnetic disturbance of the moving object;
estimating a vector of parameters characteristic of the model as a function of gradient measurements and as a function of the position of the sensors; and
determining the position of the object as a function of the position of the sensors and the parameters vector;
wherein the sensors are all installed at substantially the same physical location; and
further comprising using together an azimuth method and a Doppler phenomenon observed in the case of sources radiating a narrow band signal around a stable central frequency. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification