Abstract
Most of modern digital television and broadcast systems adopt two key techniques, namely, orthogonal frequency-division multiplex (OFDM) technology and single-frequency network (SFN) technology. The multicarrier structure of the OFDM modulation enables us to perform tomographic imaging for each subcarrier independently. No narrowband approximations are needed in this process. Furthermore, all transmitters in SFN operate at the same frequency band but situated in different locations. SFN constitutes a multistatic passive radar system naturally even with just one receiver. The spatially separated transmitters provide spatial diversity and can be exploited to improve image resolution. In this study, the authors first derive the exact formulation of subcarrier based tomographic imaging. Then, point spread function is used to study the imaging performance of the novel processing technique in terms of resolution. Finally, for several scenarios, numerical simulations are conducted and their results are compared, which indicated that the proposed method can obtain decent results even under the conditions of very limited transmitters and small target rotation angle.
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