Imaging properties of monostatic and bistatic troposcatter radars


  • Uve H. W. Lammers


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.