Ionospheric Earth Backscatter Simulation Applied to Over-the-Horizon Radar
NAVAL RESEARCH LAB WASHINGTON DC
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A precision ionospheric ray-tracing technique has been developed to predict in detail the distribution of earth backscatter measured by a high- frequency over-the-horizon radar. A first-generation version of this technique was reported in NRL Report 6731. By making use of observed earth-backscatter distributions, in conjunction with ionospheric sounding data, it has been possible to refine the ray-tracing technique and improve its performance in predicting signatures of over-the-horizon rocket launches. In particular, it has been possible to predict the time of signature onset more precisely with these improvements. This ray-tracing technique could be used in an operational over-the-horizon radar to provide, in near real time, estimates of trajectory parameters for actual hostile missile launches. Implementation of this capability in an operational radar would require the use of a sophisticated hybrid digitalanalog computer as an integral part of the radar controller and signal processor.
- Atmospheric Physics
- Active and Passive Radar Detection and Equipment
- Radiofrequency Wave Propagation