Active Filters with Voltage-Variable Passband for Application to Range-Gated MTI Systems.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Range-gated moving target indicator MTI systems have some intrinsic advantages over delay-line canceler MTI systems. A further improvement in performance would result if the doppler cut-off frequency was adjustable by the radar operator. Because of the large number of filters involved in one system this would require a voltage-variable filter element. A theory of variable filter response developed by Thiele was used as the basis for design using integrated-circuit operational amplifiers as the active elements. Three different types of active filter circuits are discussed. Implementation of voltage-variable filters and experimental frequency-response curves using field-effect transistors, Raysistors, and discrete switched resistors are described and illustrated. Author
- Electrical and Electronic Equipment
- Active and Passive Radar Detection and Equipment