Ultrasonic distance measuring system

Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

367 99, G01S 1500

Patent

active

050602055

ABSTRACT:
A distance sensing system includes an ultrasonic transducer, a transceiver and a microcontroller-based signal processing unit. The transducer periodically generates and directs towards the terrain a dual frequency ultrasonic signal. Echo signals from the ground and/or any intervening crop or trash are reflected back to the transducer and are processed. The system generates amplified and filtered echo envelope signals. Leading and trailing edge times are determined as the times the echo signals cross a threshold value which is a certain proportion of a maximum echo amplitude value. A near distance value is derived from the leading edge time of the first echo which exceeds a minimum amplitude. A far distance value is determined as the trailing edge time of the last echo signal which has an amplitude which exceeds a certain value. Multiple echo time and amplitude values are derived from the maximum amplitude echo. These values are used to prevent echoes which occur after the multiple echo time with less than a certain amplitude from being used in the determination of the far distance value. This far distance value represents the distance to ground and weaker, earlier echoes from trash or crop and later, multiple echoes may be ignored.

REFERENCES:
patent: 3454922 (1969-07-01), Dory
patent: 4414792 (1983-11-01), Bettencourt et al.
patent: 4573124 (1986-02-01), Seiferling
patent: 4760419 (1988-07-01), Fujiwara et al.
patent: 4910717 (1990-03-01), Terry

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Ultrasonic distance measuring system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ultrasonic distance measuring system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrasonic distance measuring system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-115288

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.