Method for providing time using a multiple-clock model and a clock system using such a model
US6651031B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2001 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Feb 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G7/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An N-clock system, for use for example in a ranging receiver using a Kalman filter. The clock system uses N clocks (to save power by using some clocks that consume less power) with a schedule for switching from one clock to another (so that only one clock is on at any instant of time). It uses an N-clock model that, in case of an application using clock 1 for time interval &Dgr;t1, clock 2 for time interval &Dgr;t2, . . . , and clock N for time interval &Dgr;tN, provides a state update equation for updating the N-clock system state (the state components being typically time and fractional frequency). The state update equation results from propagating the state of the assembly of N clocks (providing a single output, i.e. acting as a single clock) forward from interval to interval until the entire interval of &Dgr;t1+&Dgr;t2+ . . . +&Dgr;tN is covered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.