On-vehicle navigation apparatus
US5262774A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1993 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Mar 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An on-vehicle navigation apparatus has enhanced efficiency of the use of a memory for storing the locus data, without losing the details and accuracy of a locus pattern drawn on the basis of collected locus data. The on-vehicle navigation apparatus acquires vehicle location information C and time information T, and stores the vehicle location information C as locus data Si and the associated time information T as collecting time data Ti in response to a collection command. The apparatus then computes a travel distance D from the previous locus data collecting position on the basis of the vehicle location information C and the locus data Si, computes elapsed time .DELTA.T from the previous locus data collecting time on the basis of the time information T and the collecting time data Ti, and generates the collection command when the elapsed time .DELTA.T reaches a predetermined time after a predetermined travel distance D is reached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.