US5379047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote position determination system
Assignee: Nexus 1994 Ltd
•
Filing: 1993-10-21
•
Granted: 1995-01-03
•
Expires: 2013-10-21
Abstract
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.
Inventors
- 👤 Hanoch Yokev
- 👤 Haim Harel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:25
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7156; G; G01; G01S; G01S1/00; G01S1/02; G01S1/022; G01S1/026; G01S3/00; G01S3/02; G01S3/023; G01S3/04; G01S3/043; G01S3/10; G01S5/00; G01S5/0009; G01S5/02; G01S5/0205; G01S5/021; G01S5/04; H04B7/00; H04B7/24; H04B7/26; H04B7/2662; H04B7/2671; H04B7/2678; H04B7/2681; H04B7/2687; H04B7/2693; H04W; H04W64/00; H04W88/00; H04W88/02; H04W88/022
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
163 words
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, 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.
Claim 2
Dependent Claim
163 words
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, 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.
Claim 3
Dependent Claim
34 words
The system according to claim 1 wherein at least one of the plurality of mobile stations includes means for providing an activating signal to activate the mobile transmitter in response to an activation signal.
Claim 4
Dependent Claim
25 words
The system according to claim 2 wherein the activation signal is produced by an operator of at least one of the plurality of mobile stations.
Claim 5
Dependent Claim
22 words
The system according to claim 2 wherein the activation signal is transmitted by a base transmitter and received by the mobile receiver.
Claim 6
Dependent Claim
34 words
The system according to claim 1 wherein at least one of the plurality of mobile stations further comprises a frequency synthesizer which produces a frequency responsive to the resonant frequency of a resonant circuit.
Claim 7
Dependent Claim
34 words
The system according to claim 5, wherein the resonant circuit includes a fixed high-Q element and a perturbating element which is periodically switched into the resonant circuit whereby the resonant frequency is periodically switched.
Claim 8
Dependent Claim
14 words
The system according to claim 6 wherein the fixed high-Q element is a crystal.
Claim 9
Dependent Claim
17 words
The system according to claim 6 wherein the perturbating element is a capacitor switched by a diode.
Claim 10
Dependent Claim
30 words
The system according to claim 1 wherein the timing signal transmitted by the synchronization transmitter is independent of any signals generated by any one of the plurality of mobile stations.
Claim 11
Dependent Claim
34 words
The system according to claim 1 wherein the timing signal is a common timing signal which is used by the synchronization circuitry of the plurality, of mobile stations in providing their characteristic spread-spectrum sequences.
Claim 12
Dependent Claim
34 words
The system according to claim 9 wherein the timing signal is a common timing signal which is used by the synchronization circuitry of the plurality, of mobile stations in providing their characteristic spread-spectrum sequences.
Claim 13
Dependent Claim
43 words
The system according to claim 1 including a plurality of the base station in a spaced apart relationship and wherein the position of at least one of the plurality of mobile stations is determined by triangulation from the plurality of the base station.
Claim 14
Dependent Claim
57 words
The system according to claim 12 wherein the at least one of the plurality of the base station is a mobile base station and wherein the position of the at least one of the plurality of mobile stations is determined by triangulation from different positions of the at least one of the plurality of the base station.
Claim 15
Independent Claim
181 words
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: 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.
Claim 16
Independent Claim
181 words
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: 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.
Claim 17
Dependent Claim
58 words
The method according to claim 14 further comprising the step of providing activation signals by the at least one of the plurality of mobile stations and wherein the step of transmitting a radiated frequency hopped spread spectrum signal is activated in response to the activation signals provided by the at least one of the plurality of mobile stations.
Claim 18
Dependent Claim
37 words
The method according to claim 14 wherein the step of periodically transmitting further comprises the step of transmitting a timing signal independent of any signals generated by the at least one of the plurality of mobile stations.
Claim 19
Dependent Claim
38 words
The method according to claim 14 wherein the step of periodically transmitting further comprises the step of transmitting a common timing signal which is used by the plurality of mobile stations in providing their characteristic spread spectrum sequences.
Claim 20
Dependent Claim
51 words
The method according to claim 14 wherein the at least one base station comprises a plurality of spaced apart base stations and further comprising the step of determining the position of the at least one of the plurality of mobile stations by triangulation from the plurality of spaced apart base stations.
Claim 21
Dependent Claim
50 words
The method according to claim 14 wherein the at least one base station comprises a mobile base station and further comprising the step of determining the position of the at least one of the plurality of mobile stations by triangulation from different positions of the at least one base station.
Claim 22
Dependent Claim
160 words
A remote position determination, comprising: 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.
Claim 23
Dependent Claim
160 words
A remote position determination, comprising: 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.
References Cited (Backward Citations)
US2706933A
Cited
US3223779A
Cited
US3384822A
Cited
US3447085A
Cited
US3824468A
Cited
US3493866A
Cited
US4030033A
Cited
US4079378A
Cited
US4222115A
Cited
US4267592A
Cited
US4309703A
Cited
US4403343A
Cited
EP0095959A1
Cited
US4578819A
Cited
US4698781A
Cited
US4665404A
Cited
US4545059A
Cited
EP0166551A1
Cited
US4866732A
Cited
US5005183A
Cited
WO1988001750A1
Cited
US4747122A
Cited
EP0321698A2
Cited
WO1989012835A1
Cited
US5021794A
Cited
FR2667949A3
Cited
US5073900A
Cited
US5142534A
Cited
US5212831A
Cited
US5222101A
Cited
US5155742A
Cited
US5164958A
Cited
US5235615A
Cited
US5239677A
Cited
US5267261A
Cited
US5226045A
Cited
US5224121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |