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):

Report Date:

1965-04-01

Pagination or Media Count:

18.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE