Method and Apparatus for Position Sensing
First Claim
1. A system for sensing position comprising:
- at least one transmitting device operable to transmit a radio signal and wherein said radio signal of each of said transmitting devices is spread-spectrum coded and has a unique pseudo-noise (PN) code signal structure using longer PN-codes;
at least four processing channels each comprising a pair of receiver units in spaced relation to each other and receiver unit operable to receive a different version of the radio signal in the form of a pseudo-noise code modulated carrier signal; and
,an electronic circuit coupled to the processing channels and operable to determine a location of the radio transmitting device in relation to the receiver units based on a measurement of the radiated-signal-strength (RSS) and of the carrier signal phase delay between each of the different versions of the radio signal for each pair of receiver units;
said electronic circuit further comprising an analog-to-digital converter (ADC) for each processing channel operable to over-sample the radio signal by a factor at least five times faster than the PN chip rate of said radio signal.
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Accused Products
Abstract
Embodiments of the present invention include one or more wireless transmitting devices and an array of receiver units for receiving wireless communications from the transmitting devices. The transmitter devices and receiver units can be arranged in one, two or three dimensional configurations. Signals are transmitted from the devices for identification and accurate location determination. Spread spectrum techniques can be used, such as DSSS, FHSS, THSS, and pseudo-noise (PN) coding schemes, or combinations thereof. The transmitting devices can generate one or a plurality of data signals that are orthogonal-code modulated, to be decoded by the receiver units and a processor associated therewith. A plurality of transmitter signals can be received, identified, located, and data demodulated substantially simultaneously using embodiments of the invention. The combined use of array processing methods and diversity schemes can be used to reduce the effects of signal multi-path and occlusion.
44 Citations
20 Claims
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1. A system for sensing position comprising:
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at least one transmitting device operable to transmit a radio signal and wherein said radio signal of each of said transmitting devices is spread-spectrum coded and has a unique pseudo-noise (PN) code signal structure using longer PN-codes; at least four processing channels each comprising a pair of receiver units in spaced relation to each other and receiver unit operable to receive a different version of the radio signal in the form of a pseudo-noise code modulated carrier signal; and
,an electronic circuit coupled to the processing channels and operable to determine a location of the radio transmitting device in relation to the receiver units based on a measurement of the radiated-signal-strength (RSS) and of the carrier signal phase delay between each of the different versions of the radio signal for each pair of receiver units; said electronic circuit further comprising an analog-to-digital converter (ADC) for each processing channel operable to over-sample the radio signal by a factor at least five times faster than the PN chip rate of said radio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20)
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16. A method for sensing position comprising:
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transmitting a radio signal by at least one transmitting device, wherein said radio signal of each of said transmitting devices is spread-spectrum coded and has a unique pseudo-noise (PN) code signal structure using longer PN codes; processing said radio signal from said at least one transmitting device in the form of a pseudo-noise code modulated carrier signal by at least four processing channels each comprising a pair of receiver units being in spaced relation to each other, each receiving unit receiving a different version of said radio signal; over-sampling the radio signal by a factor at least five times faster than the PN chip rate of said radio signal; and determining a location of the transmitting device based on a comparison of the different versions of said radio signal by measuring of the radiated-signal-strength (RSS) and of the carrier phase delay between each of said different versions of said radio signal for each pair of receiver units. - View Dependent Claims (17, 18, 19)
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Specification