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This paper studies the physical layer security in amultiple-input-multiple-output (MIMO) dual-functional radar-communication(DFRC) system, which communicates with downlink cellular users and tracks radartargets simultaneously. Here, the radar targets are considered as potentialeavesdroppers which might eavesdrop the information from the communicationtransmitter to legitimate users. To ensure the transmission secrecy, we employartificial noise (AN) at the transmitter and formulate optimization problems byminimizing the signal-to-interference-plus-noise ratio (SINR) received at radartargets, while guaranteeing the SINR requirement at legitimate users. We firstconsider the ideal case where both the target angle and the channel stateinformation (CSI) are precisely known. The scenario is further extended to moregeneral cases with target location uncertainty and CSI errors, where we proposerobust optimization approaches to guarantee the worst-case performances.Accordingly, the computational complexity is analyzed for each proposed method.Our numerical results show the feasibility of the algorithms with the existenceof instantaneous and statistical CSI error. In addition, the secrecy rate ofsecure DFRC system grows with the increasing angular interval of locationuncertainty.

Secure Radar-Communication Systems with Malicious Targets: Integrating Radar, Communications and Jamming Functionalities