Test of a Monostatic FM-CW Vertical-Incidence Sounder
STANFORD UNIV CA STANFORD ELECTRONICS LABS
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The report describes a system for ionospheric vertical-incidence sounding using a low-power monostatic, FM-CW homodyne-detection technique. Advantages of such a system, as compared with the usual high-peak-power pulse- type ionosonde, are a substantial reduction in interference to other users of the HF radio spectrum, both local and distant, and a corresponding reduction of the effects of other-user interference on the sounder records. A test was conducted on 24 August 1967, using a second-generation version of the Stanford FM-CW generator, together with a commercial digital spectrum analyzer and a facsimile recorder. Real-time ionograms were obtained over a period of 2-12 minutes, using a transmitted power of 1 watt. The relatively small amount of interference produced by such a sounder would allow it to be operated--if desired--in an HF radio receiving station.
- Atmospheric Physics
- Active and Passive Radar Detection and Equipment