Local positioning system which operates based on reflected wireless signals
First Claim
1. A system comprising:
- a transmitter for transmitting wireless signals in all directions within a range of directions, the range of directions including at least all directions in a plane;
a receiver for receiving echoes of the wireless signals from any direction in the range;
a processor for processing the received echoes to derive echo data signals indicative of the distance of the system to a plurality of reflective surfaces; and
an adaptive system for;
during a training stage, learning at least one association between the echo data signals and the position of the system based on training data composed of records of echo data signals and associated system position data, and during a working stage, using the echo data signals and the learnt association to determine the position of the system.
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Abstract
A local positioning system is proposed for wirelessly locating an object using existing features within a static environment, such as walls, as the references for determining the position of the system. An antenna 16 attached to the object transmits RF signals which are reflected by the surroundings. During a training mode, the reflected signals are used to train a neural network 22, 43 to map the position of the object to the characteristics of the reflected signals. During a working mode, the trained neural network is to identify the position of the object based on reflected signals in working mode. Optionally, the reflected signals may be subject to a clustering process before input to the neural network.
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Citations
36 Claims
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1. A system comprising:
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a transmitter for transmitting wireless signals in all directions within a range of directions, the range of directions including at least all directions in a plane;
a receiver for receiving echoes of the wireless signals from any direction in the range;
a processor for processing the received echoes to derive echo data signals indicative of the distance of the system to a plurality of reflective surfaces; and
an adaptive system for;
during a training stage, learning at least one association between the echo data signals and the position of the system based on training data composed of records of echo data signals and associated system position data, and during a working stage, using the echo data signals and the learnt association to determine the position of the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of determining the position of an object, the method comprising:
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transmitting wireless signals from the object in all directions within a range of directions which includes at least all directions in a plane;
receiving at the object echoes of the wireless signals from any of the range of directions;
processing the received echoes to derive echo data signals indicative of the distance of the object to a plurality of reflective surfaces;
during a training stage, learning at least one association between the echo data signals and the position of the system based on echo data signals and associated object position data, during a working stage, using the echo data signals and the learnt association to determine the position of the object. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification