基于TDM信号的反无人机MIMO雷达系统

An anti-UAV MIMO radar system based on time-division multiplexing signal

摘要:

随着无人机威胁的日益增大,对低成本三坐标雷达的需求也逐渐增长。鉴于多输入多输出(multiple input multiple output, MIMO)技术已在通信领域得到了广泛应用,有效降低了硬件成本,可将MIMO技术引入三坐标雷达领域用于对无人机目标的探测。因此,介绍了一种基于时域复用(time-division multiplexing, TDM)信号的MIMO雷达系统。时域复用方式通过对发射单元发射时间的控制实现信号优良正交性能,并有效降低了信号产生单元与发射信道的复杂度。基于TDM信号形式,进行了MIMO雷达天线设计,给出了时分信号正交解调与数字波束形成处理的流程。计算机仿真也验证了TDM信号条件下的MIMO雷达点目标成像与波束形成的能力。

Abstract:

The increase of the unmanned aerial vehicle (UAV) threaten promotes the demand for the three-dimensional (3-D) low-cost radar. The multiple input multiple output (MIMO) technology has been widely used in the communication field, and decreases the hardware cost. Thus, it can be also used in the 3-D radar field for the UAV target detection. A MIMO radar system based on time-division multiplexing (TDM) signals is introduced in this paper. The TDM signals can achieve excellent orthogonal performance by the timing control of the transmitting units, and significantly decrease the complexity of the signal generator and the transmitting channels. Base on the TDM signals, the transmitting and receiving antennas of the MIMO radar are designed, and the signal processing procedures are investigated, including the TDM signal demodulation and the digital beam forming (DBF). The ability of point target imaging and DBF of the TMD signals is verified by computer simulation.