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) : Zrnic', Susan S ; Banjanin, Zoran

PDF Url : ADA207503

Report Date : Mar 1989

Pagination or Media Count : 71

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)

Descriptors :   *DOPPLER RADAR, *METEOROLOGICAL RADAR, *SIGNAL PROCESSING, COEFFICIENTS, DECISION THEORY, ESTIMATES, FILTERS, GROUND CLUTTER, HIGH RATE, INTERVALS, MEAN, PHASE, PULSE RATE, PULSE TRAINS, RADAR CLUTTER, REPETITION RATE, SIGNAL TO NOISE RATIO, TIME, VELOCITY, WEATHER

Subject Categories : Active & Passive Radar Detection & Equipment
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE