Ultrasonic sonar and method using transmission frequency different from reverberation frequency
US6490226B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2001 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Jan 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/527
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic sonar has a transceiver equipped with an ultrasonic oscillator. An ultrasonic wave is transmitted from the transceiver. The ultrasonic wave reflected from an obstacle is received by the ultrasonic oscillator to detect the obstacle. The transmission frequency of the ultrasonic wave is set to be different from the reverberation frequency. When the obstacle is detected, a microcomputer converts the analog signal received by the ultrasonic oscillator into a digital signal, performs a frequency transform of this signal by Fourier transform to extract only the transmission frequency component, and performs an inverse transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.