Accession Number : AD0617688

Title :   FACSIMILE AND AREAL INTEGRATION FOR WEATHER RADAR, VOLUME II.

Descriptive Note : Scientific rept.,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) STORMY WEATHER GROUP

Personal Author(s) : Wein,Marceli

Report Date : APR 1965

Pagination or Media Count : 18

Abstract : Because of the fluctuating nature of the radar echo from randomly distributed precipitation particles, several individual echo measurements have to be averaged to provide a meaningful estimate of intensity. Photography of a cathode ray tube inevitably provides some averaging by integration on film, over the area of the writing spot. Further areal integration has been achieved by rectangular scanning of fast-processed film at a rate of a few lines per second with a spot of diameter one-half mile. The effective area of integration by first writing and then reading the pattern is one square mile. The areally-averaged signals are subsequently stepped into seven levels, a factor 10 apart in received power, and displayed on a stepped grey scale on facsimile paper. This presentation is well suited for a visual quantitative estimate of echo intensity. Slow scanning results in a low frequency signal that can be sent over a voice-quality telephone line to provide within minutes radar weather maps in grey scale at any number of remot facsimile recorders. (Author)

Descriptors :   (*METEOROLOGICAL RADAR, DISPLAY SYSTEMS), (*WEATHER COMMUNICATIONS, FACSIMILE RECORDING SYSTEMS), (*FACSIMILE RECORDING SYSTEMS, WEATHER COMMUNICATIONS), WEATHER FORECASTING, ATMOSPHERIC PRECIPITATION, RADAR CROSS SECTIONS, ELECTRONIC SCANNERS, RADAR RECORDING CAMERAS, CORRELATION TECHNIQUES, METEOROLOGICAL CHARTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE