Remote position determination system
First Claim
Patent Images
1. A remote position determination system, comprising:
- at least one synchronization transmitter which periodically transmits a timing signal;
a plurality of mobile stations each including;
a mobile receive operative to receive the timing signal transmitted by the at least one synchronization transmitter;
synchronization circuitry receiving the timing signal from the mobile receiver and providing a unique spread spectrum frequency-hopping sequence wherein the frequency hopping sequence is generated in accordance with the timing signal;
a mobile transmitter producing a radiated frequency hopped spread spectrum signal responsive to the frequency-hopping sequence, andat least one base station having a plurality, of receiving antennas and a computer and operable for;
receiving the radiated frequency hopped spread spectrum signal;
determining the identity of each of the mobile stations from the unique spread spectrum frequency-hopping sequence; and
calculating the direction of the radiated frequency hopped spread spectrum signal by determining the phase of the radiated frequency hopped spread spectrum signal received by each of the plurality of receiving antennas.
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Abstract
Position determining apparatus including at least one base transmitter/receiver (BTR) station including a base transmitter which periodically transmits timing signals and a plurality of mobile transmitter/receivers (MTR). Each MTR includes a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread-spectrum frequency-hopping sequence characteristic of the particular MTR; and a mobile transmitter producing a radiated frequency hopped signal responsive to the frequency-hopping sequence and the timing signal.
123 Citations
20 Claims
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1. A remote position determination system, comprising:
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at least one synchronization transmitter which periodically transmits a timing signal; a plurality of mobile stations each including; a mobile receive operative to receive the timing signal transmitted by the at least one synchronization transmitter; synchronization circuitry receiving the timing signal from the mobile receiver and providing a unique spread spectrum frequency-hopping sequence wherein the frequency hopping sequence is generated in accordance with the timing signal; a mobile transmitter producing a radiated frequency hopped spread spectrum signal responsive to the frequency-hopping sequence, and at least one base station having a plurality, of receiving antennas and a computer and operable for; receiving the radiated frequency hopped spread spectrum signal; determining the identity of each of the mobile stations from the unique spread spectrum frequency-hopping sequence; and calculating the direction of the radiated frequency hopped spread spectrum signal by determining the phase of the radiated frequency hopped spread spectrum signal received by each of the plurality of receiving antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for remote position determination of at least one of a plurality of mobile stations in relation to at least one base station, comprising the steps of:
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periodically transmitting a timing signal from the at least one base station; receiving the timing signal by the at least one of the plurality of mobile stations; generating a unique spread spectrum frequency-hopping sequence characteristic of the at least one of the plurality of mobile stations and in accordance with the timing signal; transmitting, from the at least one of the plurality of mobile stations, a radiated frequency hopped spread spectrum signal responsive to the unique frequency-hopping sequence; receiving the radiated frequency hopped spread spectrum signal by a plurality of receiving antennas; determining the unique frequency-hopping sequence from the radiated frequency hopped spread spectrum signal; determining the identity of the at least one of the mobile stations from the unique frequency-hopping sequence; and calculating the direction of the radiated frequency hopped signal by determining the phase of the radiated frequency hopped spread spectrum signal received by each of the plurality of receiving antennas. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A remote position determination, comprising:
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at least one base station including means for periodically transmitting a timing signal; and a plurality of mobile stations each including; means for receiving the timing signal transmitted from the at least one base station; means for generating a spread spectrum frequency-hopping sequence characteristic of the particular mobile station wherein the frequency hopping sequence is generated in accordance with the timing signal; means for producing a radiated frequency hopped signal responsive to the frequency-hopping sequence the at least one base receiver further having a plurality of receiving antennas and a computer including; means for receiving the radiated frequency hopped spread spectrum signal; means for determining the identity of each of the mobile station from the unique spread spectrum frequency-hopping sequence; and means for calculating the direction of the radiated frequency hopped spread spectrum signal by comparing the phase of the radiated frequency hopped spread spectrum signal received by each of the plurality of receiving antennas.
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Specification