频率分集均匀圆阵MIMO雷达距离依赖波束形成

Range-dependent Beamforming with Frequency Diversity Uniform Circular Array MIMO Radar

均匀圆阵(UCA)与多输入多输出(MIMO)雷达的结合可在具备UCA雷达主要优点的同时兼有MIMO雷达的优势。然而,UCA-MIMO雷达的波束形成与距离无关,该特点限制了其抑制特定距离干扰的性能。文中提出频率分集UCA-MIMO雷达距离依赖波束形成方法。该方法中UCA的每个阵元发射具有微小频率步进的不同频率,从而远场的信号积累与距离有关,进而波束形成依赖于距离。仿真实验表明了该方法的有效性。

The combination of conventional uniform circular array （ UC$ } and multiple-input and multiple-output { MIMO） radar leads to a flexible technique which enjoys the advantages of MIMO radar without sacrificing the main advantage of UCA radar. However, the UCA MIMO radar is limited to range-independent directivity ; this limits the radar performance to mitigate non-desira- ble range-dependent interferences. In this paper, a new UCA MIMO radar with frequency diversity for range-dependent beamform- ing is proposed. The essence of the proposed method is each element of the UCA transmits a distinct waveform with a small fre- quency increment, the summation of signals in far-field has relationship with distance. Thus the beanlforming is range-dependent. The effectiveness of the proposed technique is verified by numerical simulation results.