作　　者： (王福来）; (庞晨）; (李永祯）; (王雪松）;

机构地区： 国防科学技术大学电子信息系统复杂电磁环境效应国家重点实验室,长沙410073

出　　处： 《雷达学报（中英文）》 2017年第4期340-348,共9页

摘　　要： 为了获得精确的极化散射矩阵测量结果,同时全极化测量体制雷达对发射信号的正交性能提出了很高要求。传统的设计方法得到的正交多相编码波形正交性能受码长的限制,同时对多普勒频移比较敏感。该文提出一种具有较好多普勒容限的正交多相编码波形优化设计方法,针对目标匀速和匀加速运动状态,考虑波形的峰值旁瓣比和波形隔离度等指标,将波形设计问题转化为非线性优化问题,利用遗传算法进行求解。仿真结果表明,相比于Deng,Khan等人提出的编码,该文设计的正交多相编码波形具有更好的多普勒容限,同时峰值旁瓣比和正交性能提升约为1.5~2 d B,能够提高同时全极化测量体制雷达的测量精度。 To obtain an accurate polarization scattering matrix, simultaneous full polarization radar systems must transmit two signals. The performance of orthogonal polyphase codes designed by the traditional method is limited by the code length and is sensitive to Doppler frequency. In this paper, we propose a design method for orthogonal polyphase codes that have good Doppler tolerance. We consider the peak sidelobe level and isolation and transform the signal design problem into a nonlinear optimization problem, which we solve using a genetic algorithm. Our simulation results show that our proposed orthogonal polyphase codes have better Doppler tolerance and their peak sidelobe levels and orthogonal performances are 1.5~2 d B better than the codes designed by Deng or Khan. As such, the new design can improve the measurement accuracy of simultaneous full polarization radar systems.

关 键 词： 雷达 同时全极化测量 正交多相编码 多普勒容限