US4982332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Road data generating method for use in an on-board navigation system
Assignee: Pioneer Corp
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Filing: 1989-03-29
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Granted: 1991-01-01
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Expires: 2009-03-29
Abstract
Abstract A road data generating method for use in an on-board navigation system. Points on roads in a map are expressed in numerical form and memorized as map data previously, and co-ordinates of the present position of the vehicle and the compass direction of the movement of the vehicle are detected and the distance to a point on a road nearest to the present position and the angle of the road at that point are determined on the basis of the map data, as decision values for the generation of road data, every time a certain distance is traveled by the vehicle. Judgment is made as to whether or not there already is registered learning data in the vicinity of the present position when the decision values exceed the predetermined values, and standard deviations of the distance and the angle with respect to the registered learning data are calculated when there is the registered learning data. The registered learning data is registered as the road data if the standard deviations are equal to or smaller than predetermined values.
Inventors
- 👤 Masaki Saito
- 👤 Takashi Kashiwazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:14
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/09; G08G1/0962; G08G1/0968; G08G1/096805; G08G1/096827; G01; G01C; G01C21/00; G01C21/38; G01C21/3804; G01C21/3807; G01C21/3815; G01C21/3833; G01C21/3844
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A new road data generating method for adding new roads into a map database for use in an on-board navigation system mounted in a vehicle, comprising the steps of: previously expressing points on roads in a map in numerical form and memorizing them as map data; detecting co-ordinated of a present position of the vehicle and compass direction of the movement of the vehicle and determining the distance to a point on a road nearest to the present position and the angle of said road at said point on the basis of said map data, as decision values for the generation of road data, every time a certain distance is traveled by the vehicle; registering learning data depending on whether or not said decision valued exceed predetermined values; judging as to whether or not there already is registered learning data in the vicinity of the present position when said decision values exceed said predetermined values; calculating standard deviations of said distance and said angle with respect to said registered learning data when there is said registered learning data; and registering said registered learning data as said new road data if said standard deviations are equal to or smaller than predetermined values.
Claim 2
Dependent Claim
201 words
A new road data generating method for adding new roads into a map database for use in an on-board navigation system mounted in a vehicle, comprising the steps of: previously expressing points on roads in a map in numerical form and memorizing them as map data; detecting co-ordinated of a present position of the vehicle and compass direction of the movement of the vehicle and determining the distance to a point on a road nearest to the present position and the angle of said road at said point on the basis of said map data, as decision values for the generation of road data, every time a certain distance is traveled by the vehicle; registering learning data depending on whether or not said decision valued exceed predetermined values; judging as to whether or not there already is registered learning data in the vicinity of the present position when said decision values exceed said predetermined values; calculating standard deviations of said distance and said angle with respect to said registered learning data when there is said registered learning data; and registering said registered learning data as said new road data if said standard deviations are equal to or smaller than predetermined values.
Claim 3
Dependent Claim
112 words
A new road data generating method as claimed in claim 1, wherein said step of registering learning data comprises steps of: registering co-ordinate data of the present position as locus data on condition that an error angle of the present value of the compass direction of the movement of the vehicle with respect to a previous value of the compass direction is greater than a predetermined angle, if there is no learning data when said decision values exceed said predetermined values; and registering said locus data as learning data if registration of the locus data has been made beforehand, when said decision values are equal to or smaller than said predetermined values.
Claim 4
Dependent Claim
60 words
A new road data generating method as claimed in claim 2, wherein a magnitude of said error angle of the present value of the compass direction of the movement of the vehicle with respect to a previous value of the compass direction is judged every time the vehicle travels a second certain distance which is longer than said certain distance.
Claim 5
Dependent Claim
129 words
A new road data generating device for adding new roads into a map database for use in an on-board navigation system mounted in a vehicle, comprising: first means for detecting compass direction of the movement of the vehicle; means for sensing distance travelled by the vehicle; second means for detecting present position of the vehicle; first memory means for storing map data; second memory means for storing newly generated road data; means for processing data received from said first memory means, first and second detecting means and sensing means to produce map data representing present position of the vehicle and if said new road data is detected, storing said new road data in said second memory means; and display means for displaying map data received from said processing means.
Claim 6
Dependent Claim
129 words
A new road data generating device for adding new roads into a map database for use in an on-board navigation system mounted in a vehicle, comprising: first means for detecting compass direction of the movement of the vehicle; means for sensing distance travelled by the vehicle; second means for detecting present position of the vehicle; first memory means for storing map data; second memory means for storing newly generated road data; means for processing data received from said first memory means, first and second detecting means and sensing means to produce map data representing present position of the vehicle and if said new road data is detected, storing said new road data in said second memory means; and display means for displaying map data received from said processing means.
Claim 7
Dependent Claim
83 words
A new road data generating device as claimed in claim 4, wherein said means for processing comprises: means for receiving said data from said sensing means, first memory means and first and second detecting means; means for calculating distance travelled by the vehicle and detecting new road data from data received from said receiving means; first means for storing processing programs used by said calculating means; and second means for storing information for executing said processing programs stored in said first storing means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |