Accession Number : ADP006282

Title :   A Review of the History of Field Strength Models in Prophet,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Sailors, David B.

Report Date : 03 MAY 1990

Pagination or Media Count : 11

Abstract : Changes in the PROPHET field strength model are reviewed. Until recently, the model was based on that developed by the Deutsche Bundespost (Damboldt, 1975). In this model the field strength depends on path distance, the transmitted power, a lower frequency limit fl, and a upper frequency limit fo. The different PROPHET version differ on how fl and fo were formulated. PROPHET implementations of fl and fo are reviewed. The most accurate PROPHET model using the Deutsche Bundespost model is a version called HFTDA. Recently, a new model was developed for paths less than 7000 km which was a significant departure from prior versions and calculates modes propagating via the E-layer as well as by the F-layer. The ionospheric absorption and over-the-MUF loss are estimated as in IONCAP. As this model made a significant improvement in the accuracy of the estimates of field strength, it was incorporated into HFTDA.

Descriptors :   *IONOSPHERIC PROPAGATION, *IONOSPHERIC DISTURBANCES, IONOSPHERIC MODELS, COMPUTER PROGRAMS, ELECTRIC FIELDS, HIGH FREQUENCY, E REGION, F REGION, LONG RANGE(DISTANCE).

Subject Categories : Radiofrequency Wave Propagation
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE