NDLI: Time optimal control of ultrasonic transducers for improved multiple object recognition

Content Provider	IEEE Xplore Digital Library
Author	Steiner, G. Watzenig, D. Schweighofer, B.
Copyright Year	2003
Description	Author affiliation: Inst. of Electr. Meas. & Meas. Signal Process., Graz, Austria (Steiner, G.; Watzenig, D.; Schweighofer, B.)
Abstract	Ultrasonic distance sensors are widely used in robotics and automotive applications because of their low cost, robustness and small size. One disadvantage of low frequency piezoelectric transducers operating in air is their small bandwidth. This results in poor spatial resolution when discriminating multiple objects within the directivity of the sensors. One method proposed in the literature is using amplitude modulation. Drawbacks of this method are very long pulse duration and the resulting high effort for matched filtering of the received signals. In order to detect multiple objects, a novel approach is proposed. It is based on time optimal control of the transmitting transducer. The optimal control sequence is determined by quadratic programming. The resulting pulse signal has a considerably shorter decay time compared to a conventional burst excitation. This allows a better resolution for the recognition of objects that are close to each other.
Sponsorship	Christian Doppler Forschungsgesellschaft Austrian Electrotechnical Assoc. MAGNA Steyr AG Instrumentation and Measurement Soc
Starting Page	69
Ending Page	73
File Size	349573
Page Count	5
File Format	PDF
ISBN	078038296X
DOI	10.1109/ROSE.2004.1317617
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-05-24
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optimal control Ultrasonic transducers Object recognition Robot sensing systems Automotive applications Costs Robustness Frequency Piezoelectric transducers Bandwidth
Content Type	Text
Resource Type	Article

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