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This paper describes the demonstration of a four-channel digital beamforming system incorporating highly integrated silicon germanium downconverter modules. The downconverter modules are designed to translate X-band frequencies (9 to 10.5 GHz) down to a common 1.0 GHz IF output. The modules were integrated with an X-band antenna array and high-speed digitizer system to form a rudimentary digital beamforming...
We have seen in the above that the SweepSAR technique offers the potential for significant reductions in the transmit peak and average power required for a SAR system. This is achieved by making full use of the areal extent of a reflector antenna on receive. The SweepSAR rate is not as big a problem as it might appear initially: note that in the 30 years since Seasat launched downlink rates for LEO...
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