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H. Elmer, H. Schweinzer:
"Effect of frequency dependent radiation of Ultrasonic Transducers to Correlation based distance measurement systems";
in: "SICICA 2003", issued by: IFAC; 5th IFAC International Symposium on Intelligent Components and Instruments for Control Applications, Universidade de Aveiro - Portugal, 2003, ISBN: 0-08-044010x, 1 - 6.

This paper gives a short overlook over methods of ultrasonic distance measurement systems. The pulse compression method is used to overcome several limits of conventional systems using burst signals and envelope dedection. The one bit correlation simplifies the implementation of a correlation based receiver that is used in a new method based on active reflection. The behavior of a piston modeled transducer is shown and its influence to transmitted signals is discussed. The impact of this effect to correlation based receivers is presented and a short application overlook is given.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04403842