Active Filters with Voltage-Variable Passband for Application to Range-Gated MTI Systems.

Abstract

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)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1968
Accession Number
AD0842886

Entities

People

  • Larry George Mitchell

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Amplifiers
  • Circuits
  • Delay Lines
  • Electronic Amplifier
  • Field Effect Transistors
  • Frequency
  • Frequency Response
  • Integrated Circuits
  • Moving Target Indicator Radar
  • Moving Targets
  • Operational Amplifiers
  • Transistors

Fields of Study

  • Engineering

Readers

  • Electronics Engineering
  • Microwave Engineering.
  • Phased Array Antenna Design.