The center frequency of each of the antennas was selected to replicate existing and planned radar satellites. The system components were installed inside an air-conditioned shelter to maintain constant temperature and humidity during the data acquisition period. Backscattering coefficients were calculated by applying the radar equation [18]. The system was calibrated using a triangular trihedral corner reflector with a backscat- tering coefficient of 0.7 dB. The overall performance of the system was also verified by comparing the observations to those obtained by other investigators using similar systems and study conditions [5], [6]. Measurements were made automatically every 10 min. A daily average backscattering coefficient was computed from the 144 measurements obtained over the course of each day. Note that only L- and C-band observations were available during the rice experiment in 2007.