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IONOSPHERIC-STRUCTURE DETERMINATION FROM VERTICAL-ANGLE MEASUREMENTS.
STANFORD UNIV CA STANFORD ELECTRONICS LABS
Use of radio techniques for study of ionospheric structure has traditionally involved measurement and interpretation of the frequency dependence of the signal transit time from transmitter to receiver. Both a vertical ionosonde, which uses a transmitter and receiver located near one another, and an oblique ionosonde, used when stations are separated by hundreds or thousands of kilometers, depend on transit-time measurements. The feasibility of using vertical-angle measurements instead of transit-time measurements as a means of ionospheric-structure study is discussed. The measurement of angles is inherently expensive because the measuring devices must be large enough to extent over several radio wavelengths. This study, however, was carried out. The similarity between real and synthetic oblique ionograms has already been illustrated, providing a check of the realism of these computations.
Contract Number 2: