基于频带特性的小波神经网络天线辐射场建模

针对外场复杂电磁环境下,传统神经网络方法在建模时极易受噪声影响而陷入局部最优,发生过拟合等问题,提出一种采用采样理论算法的小波神经网络建模方法。通过对小波神经网络和阵列天线辐射场频带特性的分析,证明了提出的改进方法可以有效降低噪声对模型影响,防止神经网络发生过拟合。仿真将改进方法与基于正则化技术的RBF神经网络建模方法进行对比,实验结果表明,改进的建模方法具有更强的抗噪能力,并对噪声的变化具有鲁棒性。

相控阵雷达外场试验目标模拟技术

针对传统雷达回波模拟技术模拟目标态势单一、建设成本高、灵活性差等缺陷,结合相控阵雷达快速波束定向的扫描特点,提出了一种基于射频存储转发技术和移动阵列平台的相控阵雷达外场试验目标模拟方法。该方法采用射频空间辐射注入的方式为雷达提供较为逼真的三维空间模拟目标回波信号和构建较为复杂的模拟目标场景态势,能够支持包括雷达天线在内的整个雷达系统进行模拟试验或训练。最后通过实例仿真验证了该方法的有效性和可实现性。

Radiation Characteristics of Rectangular Patch Antennas with an Array of Pins

The patch antennas with an array of pins （pin array patch antennas） with excellent radiation characteristics are investigated for various substrate thicknesses. The radiation in the horizontal plane of a pin array patch antenna is very small compared to that of a conventional patch antenna. And the increase of forward radiation and the decrease of backward radiation of a pin array patch antenna are obtained than those conventional one＇s. Also the half-power beamwidth of E -plane radiation pattern of a pin array patch antenna is narrower compared to that of the conventional so that the directivity is improved.