Accession Number : AD0757509

Title :   Analysis of Doppler Velocity Sensor Performance in Precipitation.

Descriptive Note : Technical rept.,

Corporate Author : AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Krile,David J.

Report Date : JAN 1973

Pagination or Media Count : 80

Abstract : Airborne Doppler velocity sensors obtain measurements of aircraft groundspeed by observing Doppler frequency shifts in beams of microwave energy reflected from the earth. When hydrometeors exist between the aircraft and the earth, some of the received energy is a result of reflections from the hydrometeors. Computer simulations were performed to determine the amount of energy reflected from raindrops with pulsed, CW, and FM/CW Dopplers. Descriptions of the simulations and their results are presented herein. They indicate that significant amounts of energy are received from rain reflections even with moderate rain rates. (Author Modified Abstract)

Descriptors :   (*GROUND SPEED INDICATORS, RELIABILITY), (*DOPPLER EFFECT, ATTENUATION), MICROWAVES, REFLECTION, ATMOSPHERIC PRECIPITATION, X BAND, DOPPLER RADAR, FLIGHT TESTING

Subject Categories : Flight Control and Instrumentation
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE