Azimuthal and Diurnal Properties of HF Backscatter
AVCO SYSTEMS DIV WILMINGTON MA
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TS RELATED TO THE AZIMUTHAL AND DIURNAL DEPENDENCE OF HF backscatter and terrestrial radio noise and the nature of earth backscatter from regions near the skip zone and from sea water. The first experiment consisted of stepped azimuth panoramic backscatter soundings over a diurnal cycle. The sounding waveform was linear FMCW with an average transmitted power of 5 kW. The second experiment explored the details of the sunrise and sunset transition periods along a fixed azimuth, also instrumented with an oblique-incidence forward-scatter FMCW ionosonde and a co-located broadband repeater. The third experiment collected an azimuthal sample of terrestrial radio noise in the guard frequency band of WWV during the silent period. The fourth experiment considered some characteristics of the leading edge of the backscatter region from the point of view of illumination control and frequency management.
- Active and Passive Radar Detection and Equipment
- Radiofrequency Wave Propagation
- Radio Communications