Patent US4815840A successfully refreshed from Google Patents.
US4815840A
Expired / Lapsed
US
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Position locating system for a vehicle
Assignee: ETM REALTY TRUST
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Filing: 1986-05-16
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Granted: 1989-03-28
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Expires: 2006-05-16
Abstract
Abstract A position locating system for a vehicle such as a mobile robot which includes a multisector sensor for sensing the coded signal emitted by a beacon. There are means responsive to the sensor for generating a code data signal representative of the coded signal and means responsive to the sensor sectors for generating an angle data signal representative of the angle from sensor to the beacon and at least one of the azimuthal and altitude dimensions.
Inventors
- 👤 Faycal E. K. Benayad-Cherif
- 👤 James F. Maddox
- 👤 II Robert W. George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:35
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/02; G05D1/021; G05D1/0231; G05D1/0234; G05D1/0236; G01; G01S; G01S3/00; G01S3/78; G01S3/782; G01S3/783; G01S5/00; G01S5/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
151 words
A system for accurately locating a vehicle in its environment comprising: a plurality of remote beacons each located in a known height relative to said vehicle and producing a unique coded signal; sensor means on said vehicle for detecting a beacon signal; means, responsive to the code of the detected signal, for identifying the beacon emitting the detected signal; means, responsive to said sensor means, for substantially continuously resolving the azimuthal angle from said sensor means to the beacon to establish a radial path from the beacon on which the vehicle lies; means responsive to said sensor means, for substantially continuously resolving the altitude angle from said sensor means to the beacon; and means, responsive to the resolved altitude angle and the known height of the identified beacon, for calculating the distance along the radial path from the sensor means to the beacon to accurately locate the vehicle in its environment.
Claim 2
Independent Claim
151 words
A system for accurately locating a vehicle in its environment comprising: a plurality of remote beacons each located in a known height relative to said vehicle and producing a unique coded signal; sensor means on said vehicle for detecting a beacon signal; means, responsive to the code of the detected signal, for identifying the beacon emitting the detected signal; means, responsive to said sensor means, for substantially continuously resolving the azimuthal angle from said sensor means to the beacon to establish a radial path from the beacon on which the vehicle lies; means responsive to said sensor means, for substantially continuously resolving the altitude angle from said sensor means to the beacon; and means, responsive to the resolved altitude angle and the known height of the identified beacon, for calculating the distance along the radial path from the sensor means to the beacon to accurately locate the vehicle in its environment.
Claim 3
Dependent Claim
20 words
The position locating system of claim 1 in which each said beacon is self-contained and independent of the other beacons.
Claim 4
Dependent Claim
16 words
The position locating system of claim 1 in which said coded signal is an optical signal.
Claim 5
Dependent Claim
19 words
The system of claim 3 in which said sensor means include means for filtering out the detected ambient light.
Claim 6
Dependent Claim
16 words
The position locating system of claim 1 in which said coded signal is an infrared signal.
Claim 7
Dependent Claim
16 words
The position locating system of claim 5 in which said infrared signal is approximately 904 nanometers.
Claim 8
Dependent Claim
16 words
The position locating system of claim 1 in which said sensor is a lateral effect photodiode.
Claim 9
Dependent Claim
17 words
The position locating system of claim 1 in which said coded signal is a modulated optical signal.
Claim 10
Dependent Claim
27 words
The system of claim 1 in which said means for identifying the beacon includes means for generating a code data signal representative of the coded beacon signal.
Claim 11
Dependent Claim
25 words
The position locating system of claim 9 in which said means for generating said code data signal includes a differentiator circuit for selecting signal transitions.
Claim 12
Dependent Claim
36 words
The position location system of claim 10 in which said means for generating said code data signal includes pulse generating means responsive to said differentiation circuit for reconstructing said coded signal from said code data signal.
Claim 13
Dependent Claim
14 words
The system of claim 1 in which said sensor means is a multisector sensor.
Claim 14
Dependent Claim
16 words
The system of claim 12 in which each sector of said sensor has an output signal.
Claim 15
Dependent Claim
30 words
The system of claim 13 in which said means for identifying the beacon includes summing means for combining the output signals of all said sectors of the said multisector sensors.
Claim 16
Dependent Claim
36 words
The system of claim 12 in which said means for resolving the azimuthal angle includes means for analyzing the relative amount of radiation from the beacon signal falling on at least two of the sensor sectors.
Claim 17
Dependent Claim
36 words
The system of claim 12 in which said means for resolving the altitude angle includes means for analyzing the relative amount of radiation from the beacon signal falling on at least two of the sensor sectors.
References Cited (Backward Citations)
US4081669A
Cited
US4119900A
Cited
US4264161A
Cited
US4218616A
Cited
US4328545A
Cited
US4274503A
Cited
US4445029A
Cited
US4441810A
Cited
US4500970A
Cited
US4463821A
Cited
US4630208A
Cited
US4573548A
Cited
US4658385A
Cited
US4638445A
Cited
JPH0663698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |