Abstract
Three tropospheric scatter systems, featuring antenna‐beam angular discrimination, or a combination of both antenna‐beam angular discrimination and signal‐delay temporal discrimination, are compared for sensitivity and spatial resolution as determined by theoretical calculations. Two of the radars used are bistatic; the third is monostatic or quasi‐monostatic. Whenever practical, parameters are chosen equal for all three radars. The linear dimensions of the scatter volume and its size as a function of position in space are determined. The imaging properties of each radar are analyzed after the scatter integral (received power level) is numerically evaluated using a tropospheric multiple‐layer model of turbulent refractive‐index structure. Results are presented for a 500‐km baselength in the bistatic case. Double layers of 100‐m vertical width and 500‐m vertical separation are displayed as seen with the angular beam resolution of 0.15° (between 3‐db points) and 40‐nsec temporal resolution corresponding to a 25‐MHz system bandwidth.
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