基于软件频率动态跟踪的交流同步采样技术

AC synchronous sampling technique based on software frequency dynamic tracking

针对传统单片机系统不具备现代操作系统管理功能的不足,本文提出并实现了一种基于32位嵌入式微处理器S3C44BOX和μC/OS-Ⅱ实时操作系统内核的交流同步采样方法。该方法将采样过程分为频率动态跟踪和等间隔同步采样两部分,分别由优先级不同的多个任务完成信号采样和数据处理,任务由抢占式的μC/OS-Ⅱ统一调度管理,较好地解决了精确性和实时性的矛盾。本文详细介绍了测量装置的硬件、软件构成以及基于μC/OS-Ⅱ的实时操作系统建立方法、信号频率检测、信号采样、谐波分析等。

Aiming at the deficiency of traditional single chip microcomputer system that doesn＇ t have the management ability of modem operating systems, an AC synchronous sampling technology was proposed and implemented, which is based on 32-bit embedded microprocessor S3C44BOX and μC/OS-Ⅱ real-time operating system kernel. This technology divides the sampling process into 2 parts, frequency dynamic tracking and equal-interval synchronous sampling. The multi-tasks that have different priorities are used to carry out signal sampling and data processing. All tasks are scheduled by the preemptive μC/OS-Ⅱ kernel. The technology has decreased the conflict between precision and real-time property. The structure of hardware and software, method of implementing real-time operating system based on μC/OS-Ⅱ kernel, signal frequency measurement, signal sampling and harmonic analysis are introduced in detail.