Multiple Phase State Near-Field Electromagnetic System And Method For Communication And Location
First Claim
1. A multiple phase state near-field electromagnetic system for information communications or location determination, comprising:
- a multiple phase state near-field transmitter comprising multiple H-field antennas having non-parallel axes, said multiple phase state near-field quadrature transmitter capable of operation in at least two phase states, each of said two phase states characterized by said multiple H-field antennas being driven by signals of different relative phase from the relative phase of each other phase state; and
a near-field receiver,said near field locator receiver receiving a difference between two signal properties from said near field transmitter for each phase state of said near field transmitter, said receiver using said differences between said two signal properties to determine said location or said information.
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Abstract
A multiple phase state near-field electromagnetic location and communication system includes a multiple phase state near-field transmitter, and a near-field locator receiver. The near-field transmitter is capable of operation in at least two states and each of these at least two states generates a state characteristic difference detected at the near-field locator receiver. The state characteristic difference may be employed for location determination, communication or both. The present invention is particularly well-suited for use in conjunction with a near-field electromagnetic ranging system. In further embodiments, a multiple phase state near-field electromagnetic location and communication process includes the steps of determining a transmission state for a near-field quadrature transmitter, transmitting a near-field transmission corresponding to said transmission state, receiving a near-field transmission corresponding to said transmission state, and determining a difference between at least two properties of said near-field transmission where the difference is characteristic of and corresponding to the transmission state.
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Citations
20 Claims
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1. A multiple phase state near-field electromagnetic system for information communications or location determination, comprising:
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a multiple phase state near-field transmitter comprising multiple H-field antennas having non-parallel axes, said multiple phase state near-field quadrature transmitter capable of operation in at least two phase states, each of said two phase states characterized by said multiple H-field antennas being driven by signals of different relative phase from the relative phase of each other phase state; and a near-field receiver, said near field locator receiver receiving a difference between two signal properties from said near field transmitter for each phase state of said near field transmitter, said receiver using said differences between said two signal properties to determine said location or said information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A near field location system comprising:
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a multiple phase state H-field transmitter transmitting a signal sequence comprising a multiple phase state signal in a first state for a first interval and in a second state for a second interval; a near field receiver comprising an E-field receiver and at least one H-field receiver, the antennas of said at least one H-field and said E-field receiver aligned significantly perpendicular to one another; a difference unit determining differences between at least two properties of said signal sequence as received by said near field receiver, said difference unit determining said differences corresponding to said first state and said second state; and a location determination unit finding a location for said transmitter based on said differences corresponding to said first state and said second state. - View Dependent Claims (16, 17, 18)
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19. A system for communication of information using near field signal properties comprising:
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a multiple phase state H-field transmitter transmitting a signal sequence comprising a multiple phase state signal in a first state for a first interval and in a second state for a second interval; an information source coupled to said transmitter, said information source determining said first state and said second state in accordance with information from said information source; a near field receiver comprising an E-field receiver and at least one H-field receiver, the antennas of said at least one H-field and said E-field receiver aligned significantly perpendicular to one another; a difference unit determining differences between at least two properties of said signal sequence as received by said near field receiver, said difference unit determining said differences corresponding to said first state and said second state; and a demodulator, said demodulator recovering said information based on said differences corresponding to said first state and said second state.
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20. A method for determining a location of a transmitter, said method comprising:
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transmitting a multiple phase state H-field signal sequence comprising a first state for a first interval and a second state for a second interval; receiving said signal sequence with a near field receiver; determining a first difference between two properties of said signal sequence corresponding to said first state and a second difference between two properties of said signal sequence corresponding to said second state; and determining said location of said transmitter based on said first difference between said two properties and said second difference between said two properties.
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Specification