System and method for position determination by impulse radio
First Claim
1. In an impulse radio system having a first transceiver with a first clock and a second transceiver spaced from said first transceiver and having a second clock, a method comprising the steps of:
- generating a first reference clock pulse using said first clock;
triggering the transmission of a first sequence of pulses with said first reference clock pulse;
transmitting from said first transceiver said first sequence of pulses;
receiving said first sequence of pulses at said second transceiver;
synchronizing said second transceiver using said first sequence of pulses;
generating a second reference clock pulse using said second clock;
triggering the transmission of a second sequence of pulses with said second reference clock pulse;
transmitting from said second transceiver said second sequence of pulses;
receiving at said first transceiver said second sequence of pulses;
synchronizing said first transceiver with said second sequence of pulses;
generating a delayed first reference clock pulse in response to said synchronization with said second sequence of pulses; and
measuring a time difference between said delayed first reference clock pulse and said first reference clock pulse, said time difference indicating a total time of flight of said first and second sequence of pulses.
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Accused Products
Abstract
A system and a method for position determination by impulse radio using a first transceiver having a first clock providing a first reference signal and a second transceiver placed spaced from the first transceiver. The system determines the position of the second transceiver. The second transceiver has a second clock that provides a second reference signal. A first sequence of pulses are transmitted from the first transceiver. The first sequence of pulses are then received at the second transceiver and the second transceiver is then synchronized with the first sequence of pulses. A second sequence of pulses are transmitted from the second transceiver. The first transceiver receives the second sequence of pulses and the first transceiver is synchronized with the second sequence of pulses. A delayed first reference signal is generated in response to the synchronization with the second sequence of pulses. A time difference between the delayed first reference signal and the first reference signal is then measured. The time difference indicates a total time of flight of the first and second sequence of pulses. The distance between the first and the second transceiver is determined from the time difference. The direction of the second transceiver from the first transceiver is determined using a directional antenna. Finally, the position of the second transceiver is determined using the distance and the direction.
279 Citations
25 Claims
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1. In an impulse radio system having a first transceiver with a first clock and a second transceiver spaced from said first transceiver and having a second clock, a method comprising the steps of:
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generating a first reference clock pulse using said first clock; triggering the transmission of a first sequence of pulses with said first reference clock pulse; transmitting from said first transceiver said first sequence of pulses; receiving said first sequence of pulses at said second transceiver; synchronizing said second transceiver using said first sequence of pulses; generating a second reference clock pulse using said second clock; triggering the transmission of a second sequence of pulses with said second reference clock pulse; transmitting from said second transceiver said second sequence of pulses; receiving at said first transceiver said second sequence of pulses; synchronizing said first transceiver with said second sequence of pulses; generating a delayed first reference clock pulse in response to said synchronization with said second sequence of pulses; and measuring a time difference between said delayed first reference clock pulse and said first reference clock pulse, said time difference indicating a total time of flight of said first and second sequence of pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In an impulse radio system having a receiver with a first clock and a transmitter spaced from said receiver and having a second clock, wherein said first clock and said second clock are initially synchronized, a method comprising the steps of:
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generating a first reference clock pulse using said first clock; triggering the transmission of a sequence of pulses with said first reference clock pulse; transmitting from said transmitter said sequence of pulses; receiving said sequence of pulses at said receiver; further synchronizing said receiver with said sequence of pulses; generating a delayed first reference clock pulse at said receiver in response to said further synchronization with said sequence of pulses; and measuring a time difference between said delayed first reference clock pulse and said first reference clock pulse, said time difference indicating a time of flight of said sequence of pulses from said transmitter to said receiver. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An impulse radio system, comprising:
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an impulse radio receiver with a first time base providing a first timing signal; an impulse radio transmitter spaced from said receiver and having a second time base initially synchronized with said first time base, wherein information related to the position of said impulse radio transmitter is determined by transmitting from said transmitter a sequence of pulses, transmission of said sequence of pulses being triggered by said first timing signal, receiving said sequence of pulses at said receiver, further synchronizing said receiver with said transmitter using said sequence of pulses, generating a delayed first timing signal at said receiver in response to said further synchronization with said sequence of pulses, and measuring a time difference between said delayed first timing signal and said first timing signal, said time difference indicating a time of flight of said sequence of pulses. - View Dependent Claims (22, 23, 24, 25)
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Specification