PROGRAMMING STUDIES FOR RADIO SIGNAL RAY TRACING.
ELECTRONIC ASSOCIATES INC PRINCETON N J PRINCETON COMPUTATION CENTER
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An analog computer program and solution for the problem of 5 kilocycle radio ray tracing in two dimensions simulating the ionosphere, exosphere, and hypothesized plasma ducts is presented. Calculations of the Group time delay and revised scaling for tracing rays launched from 0 or 40 degrees are preformed using a modified 2D program at 5 kc. Suitable forms for computer implementation of three dimensional ray tracing at low frequencies are derived. A general analysis of the scaling problems for ray tracing at frequencies from 5 kc. to 14 mc. is also presented, and a complete computer program for 3D ray tracing at 4 megacycles is presented. A special feature of this program is the use of HYDAC for generating three functions of two variables. A trospospheric ray tracing study that incorporated a two-dimensional function of refractive index was also undertaken on the HYDAC 2000 digitalanalog computer. Data was obtained and a complete set of runs made. The results confirmed the feasibility of this approach. Author