SOME BACKSCATTER, SWEEP-FREQUENCY OBSERVATIONS
STANFORD UNIV CA STANFORD ELECTRONICS LABS
Pagination or Media Count:
Analysis of the sweep-frequency, ground-back scatter echo is attempted by the application of ray theory. The variation of the time delay of the various portions of the radar echo is studied through two different methods 1 calculation of the equivalent group path, and 2 tracing the actual group path by means of an analog computer. Special attention is given the two limiting rays-the tangent ray and the minimum time-delay ray-in the study of their behavior with frequency, since they determine the shape of the sweep-frequency pattern. Both approaches agree well with experimental observations. The effects of the layer parameters on the shape are briefly investigated these include the layer model, its thickness, and the presence of horizontal gradients. A study of the striations that appear within the Sweep-Frequency Echo SFE is also reported. A description is given of continuous soundings made over a limited period in the summer of 1962 in the eastward and westward directions from Stanford, California, for the purpose of determining their time and frequency characteristics.
- Radiofrequency Wave Propagation
- Atmospheric Physics