Design of Multi-beam Anti-sorting Waveform for MIMO Radar Based on Spatial Angle Encoding

With the advancement of radar jamming technology, the threat to radar facilities is becoming increasingly severe. Hence, anti-reconnaissance and anti-jamming have become even more important in the field of radar. Most of existing multiple input multiple output (MIMO) radar waveform design algorithms avoid signal interception by creating nulls in the direction of interference. However, this method will lead to distortion of the antenna pattern, affecting the MIMO radar’s target detection capability. Each array element of a MIMO radar can radiate completely different signals, providing more degrees of freedom for radar system. This paper proposes an anti-sorting waveform design method based on spatial domain coding, utilizing the degrees of freedom of the MIMO radar transmitter. This method involves designing the emission pattern within each sub-pulse and eventually concatenating these sub-pulses in the time domain to form the entire pulse. This achieves agility in pulse width (PW) and pulse repetition interval (PRI) for reconnaissance receivers and jammers, while ensuring that the PW and PRI remain constant in the target direction. The method proposed in this paper can achieve simultaneous tracking of multiple targets, enhancing the radar’s anti-sorting capability. Simulation results validate the effectiveness of this method.