Accession Number : AD0654707

Title :   A NOTE ON THE POLARIZATION AND PHASE CHARACTERISTICS OF RADIO WAVES PROPAGATING THROUGH THE LOWER IONOSPHERE.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Goodman,John M.

Report Date : 05 JUN 1967

Pagination or Media Count : 44

Abstract : Some ionospheric radio propagation problems associated with the satellite radar situation have been examined for radar frequencies between 100 and 1000 Mc/s. It has been shown that the maximum number of fades exhibited by a train of radar pulses is governed by the quantity H csc I, where H is the magnetic field intensity and I is the magnetic field inclination, except near the magnetic equator. At 100 Mc/s the maximum number of fades is characteristically less than 50, and since the Faraday rotation is inversely proportional to the square of the radar frequency, only one-half of a fade should be observed at 1000 Mc/s. Faraday rotational signal degradation of a linearly polarized radar signal has been shown to be negligible at 1000 Mc/s except possibly during winter days at sunspot maximum. In all but possibly the polar region, it is suggested that the relationship between irregularity scale Delta L and phase excursion Delta delta is given by Delta L/Delta delta (n sub f) approximately equal to 1000, where Delta L is in meters, Delta delta is in radians, and n sub f is the radar frequency in hundreds of megacycles per second. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, POLARIZATION), PHASE(ELECTRONICS), RADAR PULSES, ATTENUATION, MAGNETOOPTICS, SCINTILLATION

Subject Categories : Active & Passive Radar Detection & Equipment
      Electromagnetic Pulses

Distribution Statement : APPROVED FOR PUBLIC RELEASE