Object tracker
US7672809B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2007 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Jul 2, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/186
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Object tracking using ultrasonic signals. A receiver receives a signal transmitted from a transmitter. The receiver uses at least two receiving elements for forming at least two analysis signals on the basis of the received signal. The receiver includes a detector, such as a phase detector, which examines the analysis signals and forms an indication on a difference between the analysis signals. The indication is, for example, indicative of a phase difference between the analysis signals. The transmitted signal is a modulated ultrasonic signal, wherein the receiver demodulates the signal to recover the modulating signal. The indication can be used to determine a heading angle information of the object to be tracked. The heading angle information may be a direction of the object with respect to the transmitter. The heading angle information can be used to make e.g. a corrective action to audio signals to be formed for listening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.