System and method for establishing the instantaneous speed of an object
US7336223B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2006 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | Apr 11, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for establishing the speed, in a safe manner, of an object (1) which is travelling along a known trajectory, including a device (3, 7) for locating the object and direction of its movement, a receiver (6) for receiving a signal from a plurality of satellites (4, 5) and processing units. For each satellite, a processing unit (8) includes a frequency meter for measuring the frequency shift of the signal received relative to the frequency of the signal transmitted, a device for establishing the vectorial difference of the speeds of the object and the satellite by calculating the Doppler effect and, a calculator of the speed in the movement direction of the object. The measurements of the frequency shift are repeated independently on signals from a plurality of satellites, and the results obtained are combined in order to obtain a speed with the desired level of safety.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.