PIC单片机的远程定时断电复位系统设计

为了实现对无人值守的电子设备定时断电复位,提出了一种基于PIC24系列单片机的远程定时断电复位系统设计方案。给出了系统的硬件和软件设计流程,同时介绍了上位机软件通信指令格式的设计,实现了远程通过以太网自动设置不同模块的定时断电复位周期的功能。该系统经过恶劣环境下测试,能有效防止主控制器出现长时间死机的事故发生。

单片机应用系统抗干扰复位电路的设计

本文研究了单片机应用系统中抗干扰复位电路的设计方法,给出了监视定时器和硬件定时复位两种新颖的电路,它们的应用,使系统的抗干扰能力和运行可靠性大大提高。

微控制器实时系统监测复位电路的软件设计

实时系统中“看门狗”电路的软件设计技术。分析“看门狗”定时溢出周期的设置与系统响应之间的关系,提出防止“看门狗”异常运行和程序“跑飞”的方法。

基于PIC单片机的远程电力线噪声滤波器设计

为了实现对低压电力线上不同频率范围的噪声提取,提出了一种基于PIC24FJ128GA108单片机的远程可调参数噪声滤波器设计方案。给出了系统的硬件和软件设计流程,同时介绍了上位机软件通信指令格式的设计,实现了远程通过以太网调节滤波器截止频率参数的功能。

Matched Field Localization Based on CS-MUSIC Algorithm

The problem caused by shortness or excessiveness of snapshots and by coherent sources in underwater acoustic positioning is considered.A matched field localization algorithm based on CS-MUSIC(Compressive Sensing Multiple Signal Classification) is proposed based on the sparse mathematical model of the underwater positioning.The signal matrix is calculated through the SVD(Singular Value Decomposition) of the observation matrix.The observation matrix in the sparse mathematical model is replaced by the signal matrix,and a new concise sparse mathematical model is obtained,which means not only the scale of the localization problem but also the noise level is reduced;then the new sparse mathematical model is solved by the CS-MUSIC algorithm which is a combination of CS(Compressive Sensing) method and MUSIC(Multiple Signal Classification) method.The algorithm proposed in this paper can overcome effectively the difficulties caused by correlated sources and shortness of snapshots,and it can also reduce the time complexity and noise level of the localization problem by using the SVD of the observation matrix when the number of snapshots is large,which will be proved in this paper.

井下水情监测系统通信方案研究

针对井下水情监测系统远距离信息传输不可靠、网络自恢复能力差等问题,笔者以RS585和光纤以太网为基础,设计了具有物理层抗干扰及应用层超时重传、定时复位功能的通信方案,完成将距离较远、位置分散的现场水情信息准确纳入指挥中心,实现了井下水情的远程监测及统一调度。试验结果表明,该方案设计的通信网络工作稳定,满足实时监测的要求。