The shell of inclined conveyor of combine often has the defect of serious vibration. In order to solve this problem, this study uses the dynamic signal test and analysis system and control the electromagnetic directional valve to realize the horizontal stability control of agricultural machinery. In order to improve the bearing accuracy, this paper designs a bearing tilt detection device. When the tilt reaches its set point, an alarm can be issued to initiate an emergency response. Taking tractor as the object, the application of real-time tilt angle measurement algorithm on three-axis multifunctional turntable is tested. At the same time, the automatic leveling system of agricultural machinery was tested in the field, and the minimum inclination angle of the chute conveying all kinds of grain and oil materials was obtained. The image collected by AGV has the characteristics of high speed, high efficiency and small resolution error. It can also correct the tilt image in real time. This study is helpful to adapt to the new requirements of modern agricultural large-scale agricultural machinery or production facilities. The monitoring system has practical guiding significance in the construction process, and has a certain promotion value.

为解决激光三角位移传感器容易受到噪声干扰影响光斑定位精度,提出了神经网络的激光三角位移传感器光斑自动定位方法.采用激光三角位移传感器测量原初步定位传感器光斑,消除前景图与背景图背景像素,利用梯度算子处理中值滤波后的激光图像,识别激光图像中光斑像素点并转化为二值梯度图,通过开闭运算与圆心拟合运算初步获取光斑中心点,利用神经网络的寻优性能确定传感器最终光斑定位结果.实验结果表明,该方法光斑定位精度高,测试不同距离的物体光斑定位精度均在99％以上,抗干扰性能强,可应用于恶劣环境下的光斑自动定位.

Digital signals can be viewed as high speed digital signal when the transmission distance within the rise time of signal is in comparison with the length of interconnection line. The signal integrity will occur when the high speed digital signal is transmitting in the interconnection line. In this paper, with the aid of ADS(Advance Designer System) software, the research on near-end crosstalk and the far-end cross talk problem in high speed digital circuit is presented which has guiding significance for the design of high speed digital circuits.

针对《现代交换技术》课程实验教学,设计了一种模块化实验教学方案.该方案是将交换系统分解成功能相对独立的模块,通过对不同模块的讲解、操作,让学生掌握相应的理论知识及应用.实践教学表明:该教学设计方案能有效地提高学生对相关知识的整体理解和掌握.

传统激光遥感图像边缘锐化方法,在图像边缘处理时会增加局部噪声、尤其在光照不均匀条件下,容易导致图像边缘失真.针对传统方法的不足,提出一种基于模糊理论的海量激光遥感图像边缘锐化方法研究,首先计算激光遥感图像边缘的锐化阈值,依据模糊特征分别建立边缘和噪声的隶属度函数,求解激光遥感图像像素相对于边缘和噪声的隶属度,并完成对图像边缘锐化系数的调整和控制,最终实现光照不均匀条件下,对海量激光遥感图像边缘的锐化处理.仿真实验结果证明,提出方法能够有效提高激光遥感图像的空间分辨率,滤除图像边缘的干扰点,在保护图像细节特征的同时,增加了图像边缘的清晰度.

针对目前扫频信号源的扫速调整复杂性问题,提出了一种可快速调整步进长度的方法,以Alter公司CycloneⅡFPGA为核心完成DDS直接数字频率合成计,以ATmega128 AVR单片机为控制器调整频率控制字K值,从而改变DDS累加器的相位增量,完成步进单位和输出频率的设置.测试表明,本系统不但能以10nHz(n=0,1,2,3,4,5,6)为步进单位从1Hz～11MHz循环输出,也可设置1Hz～11MHz间任意整数的点频输出,而且大大降低了误差,输出信号波形质量优良,较传统扫频信号源能更好满足不同精度的频率特性测试需求.

为双边或多边认可工程教育资格及工程师跨国就业,华盛顿协议提出一种教育工程认证的标准,该标准核心要求在于解决复杂工程问题,培养综合工程能力.本文结合3G通信工程实训中心,提出一种面向解决复杂通信工程问题的教学改革,包括平台改造、模块能力建设、实训项目制、团队分组协作.通过实训平台的学习,大部分同学通过工信部无线通信工程师认证、华为HCDA等.

Using the characteristics of a moving object, this paper presents a compressive imaging method for moving objects based on a linear array sensor. The method uses a higher sampling frequency and a traditional algorithm to recover the image through a column-by-column process. During the compressive sampling stage, the output values of the linear array sensor are multiplied by a coefficient that is a measurement matrix element, and then the measurement value can be acquired by adding all the multiplication values together. During the reconstruction stage, the orthogonal matching pursuit algorithm is used to recover the original image when all the measurement values are obtained. Numerical simulations and experimental results show that the proposed compressive imaging method not only effectively captures the information required from the moving object for image reconstruction but also achieves direct separation of the moving object from a static scene.

信息化逐步渗透到社会经济、生产生活的方方面面,信息通信技术的发展,推动了大数据时代的到来.人们生活在各种数据之中,既感受到了更多的便利之处,也需要面对更为严重的伦理问题.在信息通信技术的高速发展下,便捷的信息分享,对人们的隐私保护发出了挑战;特别是我国现有的规范管理制度较少,相关的法律建设处于初级阶段,对大数据时代信息通信技术伦理问题的认识较薄弱,衍生出了许多的社会问题;本文主要从大数据时代的数据身份认证、隐私保护信息相关等讨论伦理问题,分析了伦理问题的现状及发展对策,提出了对于大数据时代信息通信技术伦理学原则的几点建议.