Ground Clutter Filters for Staggered Pulse Trains.

Abstract

Several methods for canceling ground clutter on Doppler weather radars that operate with staggered PRT's are investigated. The scheme is developed that consists of two filters that operate sequentially, so that the overall filter is time-varying, with periodically changing coefficients. This filter is analyzed theoretically and through simulations for a stagger ratio of 3/2, which extends the unambiguous velocity interval (at a wavelength of 5 cm) to 50 m/s. The amplitude characteristic of the filter over this interval is very good, but the phase characteristics, which is nonlinear in about 40% of the interval, requires that a special decision logic be used for velocity estimation. At high signal-to-noise ratio (> 20 dB), mean velocities obtained from the output meet terminal Doppler weather radar specifications. Keywords: Pulse repetition time; Next generation weather radar; Weather; Doppler; Radar; Ground clutter; NEXRAD. (jhd)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1989
Accession Number
ADA207503

Entities

People

  • Susan S. Zrnic'
  • Zoran Banjanin

Organizations

  • National Oceanic and Atmospheric Administration

Tags

Communities of Interest

  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Climate Change
  • Diagrams
  • Doppler Effect
  • Doppler Radar
  • Estimators
  • Filters
  • Filtration
  • Frequency
  • Frequency Bands
  • Frequency Response
  • Ground Clutter
  • High Pass Filters
  • Low Pass Filters
  • Meteorological Radar
  • Phase
  • Statistical Analysis
  • Transfer Functions

Fields of Study

  • Engineering

Readers

  • Atmospheric Science/Meteorology
  • Radar Systems Engineering.