US5202742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser radar for a vehicle lateral guidance system
Assignee: Aisin Corp
•
Filing: 1990-10-03
•
Granted: 1993-04-13
•
Expires: 2010-10-03
Abstract
Abstract A laser radar apparatus for producing a pulse modulated transmitted light beam and receiving reflected light beams from road mounted retroreflectors. In the preferred embodiment, a floodlight beam illuminates a portion of a roadway from 20 to 150 in front of a vehicle. Reflected beams from retroreflectors mounted in the roadway are received by the radar unit which calculates distance D and angle θ between the laser radar apparatus and each retroreflector. Distance D is calculated by measuring the propagation delay of the pulse modulated light beam. Angle θ data is indicated by measuring where on a receiver photodiode array the light beam is incident.
Inventors
- 👤 Andrew A. Frank
- 👤 Masahiko Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:17
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/88; G01S17/93; G01S17/931; G01S7/00; G01S7/48; G01S7/481; G01S7/4811; G01S17/02; G01S17/06; G05; G05D; G05D1/00; G05D1/02; G05D1/021; G05D1/0231; G05D1/0234; G05D1/0236; G05D1/0238; G05D1/024; G05D1/0244; G05D1/0255; G05D1/0276; G05D1/028; G05D1/0282; G01S7/4817; G05D1/0242
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
254 words
In a vehicle guidance system for guiding a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, a method for detecting the shape of the vehicle path by measuring distance and incident angle between the vehicle and the stationary reflecting surface comprising the steps of: continuously generating at said vehicle a beam of electromagnetic radiation of predetermined dimensions; modulating at least one pulse on said beam to produce a pulse modulated beam; transmitting said pulse modulated beam from said vehicle towards at least one stationary reflecting surface; receiving a reflected pulse modulated bean from said at least one stationary reflection surface; focusing said reflected pulse modulated beam onto a detector array; measuring the position of reflected pulse modulated beam on said detector array; measuring a propagation delay between said pulse modulated beam and said reflected pulse modulated beam; calculating the distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured propagation delay; and calculating the incident angle between said vehicle and said at least one stationary reflecting surface as a proportion of the position of said reflected pulse modulated beam on said detector array, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said at least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 2
Dependent Claim
254 words
In a vehicle guidance system for guiding a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, a method for detecting the shape of the vehicle path by measuring distance and incident angle between the vehicle and the stationary reflecting surface comprising the steps of: continuously generating at said vehicle a beam of electromagnetic radiation of predetermined dimensions; modulating at least one pulse on said beam to produce a pulse modulated beam; transmitting said pulse modulated beam from said vehicle towards at least one stationary reflecting surface; receiving a reflected pulse modulated bean from said at least one stationary reflection surface; focusing said reflected pulse modulated beam onto a detector array; measuring the position of reflected pulse modulated beam on said detector array; measuring a propagation delay between said pulse modulated beam and said reflected pulse modulated beam; calculating the distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured propagation delay; and calculating the incident angle between said vehicle and said at least one stationary reflecting surface as a proportion of the position of said reflected pulse modulated beam on said detector array, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said at least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said beam of electromagnetic radiation comprises a light beam.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said light beam comprises a laser beam.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein said laser beam comprises an infrared laser beam.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein said infrared laser beam has a wavelength of 904 nanometers.
Claim 7
Dependent Claim
27 words
The method of claim 1 wherein said modulating step further comprises the step of modulating said beam with a pulse of 10 to 20 nanoseconds in width.
Claim 8
Dependent Claim
18 words
The method of claim 6 wherein said pulse has a rise time of between 10 to 30 nanoseconds.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein said beam of predetermined dimensions comprises a floodlight beam.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein said detector array is a photodiode array.
Claim 11
Dependent Claim
12 words
The method of claim 1 wherein said reflecting surface comprises a retroreflector.
Claim 12
Dependent Claim
43 words
The method of claim 1 wherein said measuring step further comprises the step of measuring the propagation delay between said pulse modulated beam and said reflected pulse modulated beam at a point equal to a predetermined fraction of the amplitude of each beam.
Claim 13
Dependent Claim
12 words
The method of claim 11 wherein said predetermined fraction is one tenth.
Claim 14
Dependent Claim
276 words
In a vehicle guidance system for a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, an apparatus for detecting the shape of the vehicle path by measuring distance and incident angle between a vehicle and a stationary reflecting surface comprising: vehicle mounted generating means for continuously generating a beam of electromagnetic radiation of predetermined dimensions; modulator means for modulating at least one pulse on said beam to produce a pulse modulated beam; transmission means for transmitting said pulse modulated beam toward at least one stationary reflecting surface; vehicle mounted receiving means for receiving a reflected pulse modulated beam from at least one stationary reflecting surface; focusing means for focusing said reflected pulse modulated beam onto a detector array; vehicle mounted detector means for measuring the position of reflected pulse modulated beam on said detector array and measuring a propagation delay between said pulse modulated bean and said reflected pulse modulated beam; first calculating means for calculating said distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured propagation delay; and second calculating means for calculating said incident angle between said vehicle and said at least one stationary reflecting surface as a proportion of the position of said reflected pulse modulated beam on said detector array, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said at least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 15
Dependent Claim
276 words
In a vehicle guidance system for a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, an apparatus for detecting the shape of the vehicle path by measuring distance and incident angle between a vehicle and a stationary reflecting surface comprising: vehicle mounted generating means for continuously generating a beam of electromagnetic radiation of predetermined dimensions; modulator means for modulating at least one pulse on said beam to produce a pulse modulated beam; transmission means for transmitting said pulse modulated beam toward at least one stationary reflecting surface; vehicle mounted receiving means for receiving a reflected pulse modulated beam from at least one stationary reflecting surface; focusing means for focusing said reflected pulse modulated beam onto a detector array; vehicle mounted detector means for measuring the position of reflected pulse modulated beam on said detector array and measuring a propagation delay between said pulse modulated bean and said reflected pulse modulated beam; first calculating means for calculating said distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured propagation delay; and second calculating means for calculating said incident angle between said vehicle and said at least one stationary reflecting surface as a proportion of the position of said reflected pulse modulated beam on said detector array, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said at least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 16
Dependent Claim
13 words
The apparatus of claim 13 wherein said generating means generates a light beam.
Claim 17
Dependent Claim
13 words
The apparatus of claim 13 wherein said generating means generates a laser beam.
Claim 18
Dependent Claim
14 words
The apparatus of claim 13 wherein said generating means generates an infrared laser beam.
Claim 19
Dependent Claim
16 words
The apparatus of claim 16 wherein said infrared laser beam has a wavelength of 904 nanometers.
Claim 20
Dependent Claim
15 words
The apparatus of claim 13 wherein said pulse is 10 to 20 nanoseconds in width.
Claim 21
Dependent Claim
18 words
The apparatus of claim 18 wherein said pulse has a rise time of between 10 to 30 nanoseconds.
Claim 22
Dependent Claim
15 words
The apparatus of claim 13 wherein said beam of predetermined dimensions comprises a floodlight beam.
Claim 23
Dependent Claim
13 words
The apparatus of claim 13 wherein said detector array is a photodiode array.
Claim 24
Dependent Claim
12 words
The apparatus of claim 13 wherein said reflecting surface comprises a retroreflector.
Claim 25
Dependent Claim
38 words
The apparatus of claim 13 wherein said detecting means measures the propagation delay between said pulse modulated beam and said reflector pulse modulated beam at a point equal to a predetermined fraction of the amplitude of each beam.
Claim 26
Dependent Claim
12 words
The apparatus of claim 13 wherein said predetermined fraction is one tenth.
Claim 27
Dependent Claim
240 words
In a vehicle guidance system for guiding a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, a method for detecting the shape of the vehicle path by measuring distance and incident angle between the vehicle and the stationary reflecting surface comprising the steps of: continuously generating at said vehicle a fan shaped beam of electromagnetic radiation of predetermined dimensions; modulating said beam to produce a modulated fan shaped beam; scanning said modulated fan shaped beam through a predetermined arc towards at least one stationary reflecting surface; receiving a reflected modulated beam from said at least one stationary reflecting surface; measuring an angle of said fan beam within said predetermined arc; measuring a phase difference said modulated fan shaped beam and said reflected modulated beam; and calculating the distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured phase difference; and calculating the incident angle between said vehicle and said at least one stationary reflecting surface as a portion of said angle of said fan beam within said predetermined arc, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said at least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 28
Dependent Claim
240 words
In a vehicle guidance system for guiding a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, a method for detecting the shape of the vehicle path by measuring distance and incident angle between the vehicle and the stationary reflecting surface comprising the steps of: continuously generating at said vehicle a fan shaped beam of electromagnetic radiation of predetermined dimensions; modulating said beam to produce a modulated fan shaped beam; scanning said modulated fan shaped beam through a predetermined arc towards at least one stationary reflecting surface; receiving a reflected modulated beam from said at least one stationary reflecting surface; measuring an angle of said fan beam within said predetermined arc; measuring a phase difference said modulated fan shaped beam and said reflected modulated beam; and calculating the distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured phase difference; and calculating the incident angle between said vehicle and said at least one stationary reflecting surface as a portion of said angle of said fan beam within said predetermined arc, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said at least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 29
Dependent Claim
15 words
The method of claim 25 wherein said beam of electromagnetic radiation comprises a light beam.
Claim 30
Dependent Claim
13 words
The method of claim 26 wherein said light beam comprises a laser beam.
Claim 31
Dependent Claim
14 words
The method of claim 27 wherein said laser beam comprises an infrared laser beam.
Claim 32
Dependent Claim
16 words
The method of claim 28 wherein said infrared laser beam has a wavelength of 904 nanometers.
Claim 33
Dependent Claim
24 words
The method of claim 25 wherein said modulating step further comprises the step of modulating said fan shaped beam with a sinusoidal carrier wave.
Claim 34
Dependent Claim
19 words
The method of claim 30 wherein said sinusoidal carrier wave has a frequency of between 1 and 10 megaHertz.
Claim 35
Dependent Claim
43 words
The method of claim 25 wherein said measuring step further comprises the step of measuring the phase difference between said modulated fan shaped beam and said reflected modulated beam at a point equal to a predetermined fraction of the amplitude of each beam.
Claim 36
Dependent Claim
13 words
The method of claim 25 wherein said stationary reflecting surface comprises a retroreflector.
Claim 37
Dependent Claim
269 words
In a vehicle guidance system for a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, an apparatus for detecting the shape of the vehicle path by measuring distance and incident angle between a vehicle and a stationary reflecting surface comprising: vehicle mounted generating means for continuously generating a fan shaped beam of electromagnetic radiation of predetermined dimension; modulator means for modulating said fan shaped beam to produce a modulated fan shaped beam; scanning means for scanning said modulated fan shaped beam through a predetermined arc towards at least one stationary reflecting surface; vehicle mounted means for receiving a reflected modulated beam from said at least one stationary reflecting surface; vehicle mounted detector means for measuring a phase difference between said modulated fan shaped beam and said reflected modulated beam; and vehicle mounted measuring means for measuring an angle of said fan beam within said predetermined arc, first calculating means for calculating said distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured phase difference; and second calculating means for calculating said incident angle between said vehicle and said at least one stationary reflecting surface as a proportion of said angle of said fan beam within said predetermined arc, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said sat least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 38
Dependent Claim
269 words
In a vehicle guidance system for a vehicle traveling on a non-fixed path comprising an apparatus for continuously generating a beam of electromagnetic radiation for scanning a stationary reflecting surface and an apparatus for receiving reflected electromagnetic radiation from said stationary reflecting surface, an apparatus for detecting the shape of the vehicle path by measuring distance and incident angle between a vehicle and a stationary reflecting surface comprising: vehicle mounted generating means for continuously generating a fan shaped beam of electromagnetic radiation of predetermined dimension; modulator means for modulating said fan shaped beam to produce a modulated fan shaped beam; scanning means for scanning said modulated fan shaped beam through a predetermined arc towards at least one stationary reflecting surface; vehicle mounted means for receiving a reflected modulated beam from said at least one stationary reflecting surface; vehicle mounted detector means for measuring a phase difference between said modulated fan shaped beam and said reflected modulated beam; and vehicle mounted measuring means for measuring an angle of said fan beam within said predetermined arc, first calculating means for calculating said distance between said vehicle and said at least one stationary reflecting surface as a proportion of said measured phase difference; and second calculating means for calculating said incident angle between said vehicle and said at least one stationary reflecting surface as a proportion of said angle of said fan beam within said predetermined arc, wherein the shape of the vehicle path is detected from the distance and angle between said vehicle and said sat least one stationary reflecting surface and said vehicle is guided to follow said detected path.
Claim 39
Dependent Claim
13 words
The apparatus of claim 34 wherein said generating means generates a light beam.
Claim 40
Dependent Claim
13 words
The apparatus of claim 34 wherein said generating means generates a laser beam.
Claim 41
Dependent Claim
14 words
The apparatus of claim 34 wherein said generating means generates an infrared laser beam.
Claim 42
Dependent Claim
15 words
The apparatus of claim 37 wherein said infrared laser beam has wavelength of 904 nanometers.
Claim 43
Dependent Claim
14 words
the apparatus of claim 34 wherein said carrier wave is a sinusoidal carrier wave.
Claim 44
Dependent Claim
19 words
The apparatus of claim 39 wherein said sinusoidal carrier wave has a frequency of between 1 and 10 megaHertz.
Claim 45
Dependent Claim
38 words
The apparatus of claim 34 wherein said detecting means measures the phase difference between said modulated fan shaped beam and said reflected modulated beam at a point equal to a predetermined fraction of the amplitude of each beam.
Claim 46
Dependent Claim
14 words
The apparatus of claim 34 wherein said scanning means comprises a movable mirror surface.
Claim 47
Dependent Claim
14 words
The apparatus of claim 34 wherein said scanning means further comprises a holographic disc.
Claim 48
Dependent Claim
12 words
The apparatus of claim 34 wherein said receiving means comprises a photodiode.
References Cited (Backward Citations)
US3172496A
Cited
US4279036A
Cited
US3619618A
Cited
US3708668A
Cited
US3881568A
Cited
US3802780A
Cited
US4007991A
Cited
US3918172A
Cited
US4049961A
Cited
US3970840A
Cited
US4069888A
Cited
US4184767A
Cited
US4019060A
Cited
US4111552A
Cited
US4136949A
Cited
US4099591A
Cited
US4313654A
Cited
US4168908A
Cited
US4227261A
Cited
US4218138A
Cited
US4227807A
Cited
US4387988A
Cited
US4225226A
Cited
US4477184A
Cited
US4373804A
Cited
US4355895A
Cited
US4383238A
Cited
US4419011A
Cited
US4395121A
Cited
US4349277A
Cited
US4445029A
Cited
US4486095A
Cited
US4441810A
Cited
US4436418A
Cited
US4443103A
Cited
US4514083A
Cited
US4425043A
Cited
US4515472A
Cited
US4515471A
Cited
US4484069A
Cited
US4552456A
Cited
US4769700A
Cited
US4575237A
Cited
US4498768A
Cited
US4538907A
Cited
US4511248A
Cited
US4497065A
Cited
US4580250A
Cited
US4556313A
Cited
US4572662A
Cited
US4566032A
Cited
US4632543A
Cited
US4647784A
Cited
US4727492A
Cited
US4573547A
Cited
US4644146A
Cited
US4700301A
Cited
US4660970A
Cited
US4752964A
Cited
US4673817A
Cited
US4703820A
Cited
US4716298A
Cited
US4706195A
Cited
US4668859A
Cited
US4615615A
Cited
USH341H
Cited
US4652107A
Cited
US4721385A
Cited
US4630109A
Cited
US4703240A
Cited
US4729660A
Cited
US4940925A
Cited
US4811228A
Cited
US4770526A
Cited
US4734572A
Cited
US4817000A
Cited
US4815840A
Cited
US4797557A
Cited
US4849644A
Cited
US4878754A
Cited
US4796198A
Cited
US4818887A
Cited
US4812035A
Cited
US4811229A
Cited
US4788439A
Cited
US4855915A
Cited
US4947094A
Cited
US4846297A
Cited
US4790402A
Cited
US4861159A
Cited
US4818100A
Cited
US4916324A
Cited
US4877311A
Cited
US4902126A
Cited
US4876444A
Cited
US4950075A
Cited
US4895440A
Cited
US4918607A
Cited
US4903054A
Cited
EP0361914A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |