Accession Number:

ADA207503

Title:

Ground Clutter Filters for Staggered Pulse Trains.

Descriptive Note:

Final rept.,

Corporate Author:

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION NORMAN OK NATIONAL SEVERE STO RMS LAB

Personal Author(s):

Report Date:

1989-03-01

Pagination or Media Count:

71.0

Abstract:

Several methods for canceling ground clutter on Doppler weather radars that operate with staggered PRTs 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 32, which extends the unambiguous velocity interval at a wavelength of 5 cm to 50 ms. 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

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE