Accession Number : AD0454896


Title :   MEASUREMENTS OF VLF WAVE-FRONT COMPONENTS OVER LONG PATHS.


Descriptive Note : Final rept.,


Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF


Personal Author(s) : Parks,G S ,Jr ; Whitson,A L ; Price,G H ; Parker,H W


Report Date : Mar 1964


Pagination or Media Count : 310


Abstract : A receiving system that sampled six components of the received wave front--three orthogonal electric (E) field components and three orthogonal magnetic (H) field components--was operated at Perth, Western Australia. A prototype system was also operated at Tracy, California. Transmissions at VLF from five U. S. Navy stations were monitored and recorded. Data have been processed for several periods between April and August 1963. Theoretical results derived from mode theory calculations are summarized as a basis for comparing the wavefront data with the currently accepted theory of long-distance VLF propagation. An outline of this theory is given. The wave-front data are described and discussed. Comparisons of the results of the theoretical calculations and the data demonstrate the limitations of this theory for predicting antipodal effects. A collection of phase and amplitude plots, obtained by the operation of an auxiliary portion of the receiving system, is included with brief comments. Appendixes describe the data processing, the receiving system, some keying characteristics observed on VLF transmitters, and the results of monitoring the phase and amplitude of certain VLF stations during the solar eclipse of 20 July 1963. (Author)


Descriptors :   *RADIO RECEPTION , PROPAGATION , VERY LOW FREQUENCY , VERY LOW FREQUENCY , RADIO TRANSMISSION , MONITORS , INFORMATION THEORY , EXPERIMENTAL DATA , PHASE(ELECTRONICS) , DATA PROCESSING , RADIO RECEIVERS , RADIO TRANSMITTERS , SOLAR ECLIPSES , POLARIZATION , IONOSPHERIC DISTURBANCES , ENGINEERING DRAWINGS , LOOP ANTENNAS , CALIBRATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE