中文摘要：

多输入多输出雷达（MIMORadar）体制综合采用多通道、等效发射波束形成技术，为天波超视距雷达（OTHR）面临的杂波多普勒扩展提供了一条有效的解决途径。具有良好的自相关性能和低互相关电平的正交波形集是MIMO雷达体制应用的关键。从信号处理的角度出发，利用互模糊函数对正交频分线性调频信号（OFD—LFM）的互相关峰值幅度及位置进行了分析，给出了正交信号的设计规律，仿真实验验证了分析的正确性。

英文摘要：

Synthesizing the multiple-channel and non-causal transmit beamforming techniques, the multiple-input multiple-output radar architecture can provide a feasible approach for solving the Doppler-spread clutter in Over-the-horizon Radar（OTHR）. Orthogonal waveform set with good property of auto-correlation and low level of cross-correlation is crucial for MIMO radar architecture implementation. From the perspective of signal processing, based on cross-ambiguity function, the location and level of the cross-correlation peaks of orthogonal frequency division linear frequency modulation （OFD-LFM） signals are analyzed, then the design rule of orthogonal signal is presented. At last, the simulation results validate these anysics.