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中文摘要：
为提高MIMO天波雷达的发射波形的距离分辨力,以减小检测单元尺寸,改善信杂比和目标定位精度,针对MIMO天波雷达工作环境恶劣,干扰较多,寂静频带非连续的情况,用几个不连续的寂静频带来合成大的有效带宽,给出了两种非连续谱条件下正交相位编码波形的设计方法。采用产生满足特定频谱约束的相位编码信号的循环迭代算法生成,利用算法对初值的敏感性,设定不同随机初值,即可生成一组发射波形,仿真证明了该方法的有效性。通常谱约束越强,波形性能（自相关、互相关和分辨力等）越差,调节谱约束的强弱,即可得到满意的正交相位编码波形,所设计的波形充分利用了频谱资源,大幅提高了发射波形的距离分辨力。
英文摘要：
To increase the range resolution of MIMO skywave radar transmit waveform,in order to decrease the area of detection cell and increase signal clutter ratio（ SCR） and target location accuracies,for the intermittent frequency band situations caused by poor operation environment full of a lot of interference,two orthogonal phase code waveform design methods are developed,the waveforms＇ effective bandwidth is synthesized of several discontinuous clear frequency bands. The orthogonal phased code waveforms are generated by the iterative algorithm for getting phased code signal to satisfy desired frequency spectrum constraints. Exploiting the sensitiveness to the initial value,set different random initial value,a group of waveforms are obtained,the effectiveness of the waveform design methods are illustrated by the numeric simulaiton. Generally,the stronger the constraints are,the worse the waveforms performance including ACFs,CCFs and resolutions are. To adjust the constraints,satisfying waveforms will be generated. The frequency band source is fully exploited and the range resolution are increased by a wide margin.
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