Accession Number : ADA117851

Title :   Development of a Minicomputer Atmospheric Noise Model.

Descriptive Note : Technical rept. Jan-Sep 81,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Sailors,D B ; Brown,R P

PDF Url : ADA117851

Report Date : 01 May 1982

Pagination or Media Count : 107

Abstract : A practical but simplified atmospheric noise model for use in estimating system signal-to-noise ratios in micro-mini-computer based HF propagation prediction systems is presented. Numerical mapping techniques were used to represent worldwide atmospheric noise at 1 MHz in 24 numerical maps: one for each of six 4-hour time blocks (in universal time) and each of four 3-month periods. This representation results in a minimum reduction by one-fifth in the number of coefficients necessary in computer memory over that of an earlier model in which the map represented an entire twenty-four hour day. (Author)

Descriptors :   *Noise(Radio), Atmospheric electricity, Global, High frequency, Mapping, Mathematical models, Computerized simulation, Computer programs, Microcomputers, Minicomputers, Radio transmission, Signal to noise ratio

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE