Fixed range indicating system for use in a vehicle travel path indicating apparatus
US4535335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1984 |
| Grant date | Aug 13, 1985 |
| Priority date | — |
| Expiry date | Aug 3, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/367
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved fixed range or distance indicating system for use in a visual travel route indicating apparatus of a vehicle. The fixed range indicating system minimizes memory capacity by discretely storing locational data obtained from discrete arithmetical calculation made at a suitable predetermined interval to present relatively short vector segments optimized in accordance with the given scale of indication on the display and at the same time provides a relatively high accuracy in approximating a current locational indication of the vehicle. A plurality of basic scales of indication varying with doubled denominators in accordance with a given variety of basic scales of indication are presented, the locational data are picked-up discretely at a rate corresponding to the plurality of basic scales of indication, and the thus picked-up locational data is stored into prescribed memory tables within a given limit of indication by way of an endless store mode. The current indicated path of travel on the display is erased at the interval of a fixed range travelled by the vehicle corresponding to the basic scales of indication, and refreshed points of indication are determined for a new l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.