基于ColdFire的PROFIBUS-DP智能从站的设计

介绍了一种基于ColdFire系列MCF52258芯片的PROFIBUS-DP智能从站的设计方法,描述了PROFIBUS协议的结构,阐述了相关的硬件和软件设计方法,由CP5611和PC机构成主站与从站通讯。实践证明该智能从站可以方便的连接具有RS232或者RS485接口的设备。     

Camera calibration approach using circle-square-combined target

Calibrating a small field camera is a challenging task because the traditional target with visible feature points that fit the limited space is difficult and costly to manufacture.We demonstrate a novel combined target used in camera calibration.The tangent points supplied by one circle located at the center of a square are used as invisible features,and the perspective projection invariance is proved.Both visible and invisible features extracted by the proposed feature extraction algorithm are used to solve the calibration. The target supplies a sufficient number of feature points to satisfy the requirements of calibration within a limited space.Experiments show that the approach can achieve high robustness and considerable accuracy. This approach has potential for computer vision applications particularly in small fields of view.     

智能反射表面辅助的反向散射通信系统研究综述

智能反射表面技术因其具有智能重构无线通信环境的卓越能力，在6G中具有广泛的应用。反向散射通信技术作为低功率通信的典型技术，可应用于超低功率通信和低成本物联网设备。概述了智能反射表面技术和反向散射通信技术，并对其研究意义进行了分析；从性能分析、信道估计、波束赋形、资源调度等多方面总结分析了反向散射通信技术和智能反射表面技术的研究现状及发展趋势。在此基础上，对智能反射表面辅助的反向散射通信系统进行了探讨，并对未来发展方向进行了展望。