November 1970 | NTIA Technical Memo OT ITSTM 16

Backscatter studies and 3 D ray tracing final report

J. C. Blair

Abstract: Azimuth and spectrum spread was measured from sidescatter and great circle signals over two transmission paths: Washington, D. C. to Boulder, Colorado, and Long Branch, Illinois, to Boulder. Both Doppler and fading spread were measured. The effectiveness of these spread measure­ments in detecting sidescatter to improve the accuracy of DF measurements was determined. The fading component of the complex spectrum was found to provide most of the detection capability. From fading spread measurements, about 75 percent of sidescatter could be detected with 95 percent confidence; from azimuth spread measurements, about 85 percent of sidescatter could be detected with 95 percent probability of success. When both fading and azimuth spread are measured, it appears possible to detect over 95 percent of sidescatter with 95 percent confidence. These conclusions are only good for the Long Branch to Boulder path. The data from the longer path was not taken in large enough quantities to be conclusive.

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