Multidimensional Waveform Design for Countering Noncooperative Utilization in Bistatic Radar

Noncooperative parties (NCPs) can directly capture and use the electromagnetic signals from our bistatic radar to achieve covert detection with low power and forwarding deception. Existing methods increase the difficulty for NCPs to extract, classify, and process signals by transmitting complex modulated waveforms, but still cannot prevent waveforms from being utilized. This paper proposes a multidimensional waveform for countering noncooperative utilization in bistatic radar. First, fully use the degrees of freedom of the area array emitter to synthesize the desired signal in a specific azimuth-elevation direction through waveform modulation in the element, time and coding domains. Then, the alternating projection algorithm is used to solve for the waveform to counter noncooperative utilization, under constraints on signal-to-noise ratio loss and constant modulus. This makes NCPs unable to receive the radar signal or receive pre-designed deceptive signal. Simulations validate that the designed waveform can reduce the efficiency of NCPs while maintaining the performance of cooperative parties.