Date of Award
Electrical and Computer Engineering
Soltis, J. J.,
Engineering, Electronics and Electrical.
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This work presents the application of chirp techniques used commonly in microwave radars to the problem of ultrasonic ranging in the atmosphere. The object of this thesis was to extend the range of the commercially available Polaroid ranging system, which according to the manufacturer's specifications has a maximum range of 35 feet or 11.7 meters. Linear frequency modulation of a sinusoid at the transmitting end results in a signal with a large bandwidth content, which combined with matched filtering at the receiver produces the effect of pulse compression on the received signal. This is specifically important in ranging systems as the operator is only interested in ascertaining as to whether a replica of the transmitted signal is present in the signal is present in the echo or not. Amplitude weighting of the matched filter impulse response to reduce the range sidelobes in the matched filter output has been investigated. The circuitry provided by Polaroid has been modified in order to enable ranging to larger distances. The processing station was an IBM compatible 486 machine, with a signal processing board on it. The software used for the purpose was 'SPOX' which is a C language type digital signal processing development system.Dept. of Electrical and Computer Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1994 .K85. Source: Masters Abstracts International, Volume: 33-04, page: 1306. Adviser: J. J. Soltis. Thesis (M.Sc.A.)--University of Windsor (Canada), 1994.
Kumar, Subramanian., "Range extension in acoustic distance measurement." (1994). Electronic Theses and Dissertations. 3267.