A SIMO-SF (single input and multiple output, step-frequency) radar system is presented for numerical simulations of electromagnetic scattering, imaging and reconstruction of a complex electric-large target. The SIMO-SF system utilizes the linear SF radar array, working at 2 ～ 6 GHz band in downward-looking spotlight mode and moving in transverse to form a 2-D (dimensional) synthetic array. The central radar of the array is used as both the transmitter and receiver, and the others are the receivers only. Suppose the radar number be N, the data acquisition time of the SIMO can be N times smaller than the SISO (single input and single output) model. The FEKO codes are employed to calculate electromagnetic scattering from a complex electric-large target. An improved 3-D RMA (range migration algorithm) is then utilized to make the radar imaging. Finally, reconstruction of the 3-D PEC target, i.e., a tank-like, is presented and discussed.
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