Theoretical research on tropospheric scatter propagation in the United States, 1954-1957

This paper outlines recent progress in the theory of tropospheric scatter propagation in the United States. In the past three years, the emphasis of theoretical research has shifted from the analysis of the average signal level to the analysis of the signal statistics and to the underlying hydrodynamics of atmospheric turbulence. As might be expected in such a new and complex field, there is far from unanimity of opinion as to the "best" model to explain the myriad experimental results.