超宽带昆虫雷达的信号处理与仿真  

Processing and Simulating of Ultra-Wide-Band Insect Radar Signal

作　　者：熊新农[1] 焦忠建 黄长干[1] 涂海华[1] 

机构地区：[1]江西农业大学理学院,江西南昌330045

出　　处：《计算机仿真》2013年第10期438-442,共5页Computer Simulation

基　　金：国家自然科学基金(31260427);江西省教育厅科技项目(GJJ12230);江西省教育科学规划课题(11YB245);江西农大校青年基金(2963)

摘　　要：研究昆虫生态学中低空飞行昆虫监测的工程问题,提出了一种利用超宽带雷达的监测方法。首先采用对数周期偶极天线环形阵,设计各阵元天线虚顶点共圆的空心环调整阵列的物理孔径;然后利用振子加权矩阵选取有效振子,改进宽带信号空间谱估计算法并引入谐波雷达技术抑制干扰,从而获取低空飞行的不同昆虫目标的信息。采用仿真分析了空心环的角度分辨力,然后通过选取有效振子来改善到达角估计的问题,最后仿真了在信噪比不同的情况下两个尺寸大小不同的低空飞行目标的二维到达角估计,结果与理论要求一致。In order to study the flying insect of low altitude in radar entomology, the corresponding method was proposed based on ultra wide band radar. Firstly, a circular entad log- periodic dipole antennas array was taken as receiver. For enlarging moderately the aperture, the circular array was changed into a ring - shaped array whose shor- test dipole of each element did not be located in the centre of a circle. Secondly, the weight matrix about Wideband Focusing Matix Method was adopted to make choice of the valid pole. The important information of different insects flying at low altitude was obtained by the modified algorithms of spatial spectrum estimation and the harmonic radar technique for clutter suppression. The detection of flying insect was simulated by computer. Firstly, the angle resolu- tion capacity of ring -shaped array was analyzed. Secondly, the estimation of DOA （Direction Of Arrival） was re- worked by choosing the valid pole. Finally, the DOA estimation of two insects flying at low altitude with different size and SNR（ Signal Noise Ratio）were simulated. The result is consistent with the theoretical analysis.

关 键 词：昆虫雷达 超宽带 对数周期偶极天线 谐波雷达技术 空间谱估计 

分 类 号：TN955[电子电信—信号与信息处理]