Phase Center Agile Array: a New Bistatic Radar Scheme for Encrypted Sensing

Bistatic radar has received much interest due to its advantages over monostatic radar such as capabilities of anti-stealth and anti-jamming. In conventional bistatic radar systems, by using the direct signal from the transmit station as reference, any receiver is able to perform radar functionalities such as detection and estimation. However, in some situations where dedicated transmitter is used such as military application, it is unacceptable for the transmitted signal to be utilized by enemy receivers. In this paper, we propose Phase Center Agile Array: a physical layer encryption scheme for bistatic radars and corresponding target detection method so that the signal from the transmitter can only be utilized by the desired receivers. The effectiveness and the properties of the encryption scheme are demonstrated via simulation results.