基于DSP的高精度频率测量系统的研究

针对在脉冲频率测量中,测量精度低的问题,提出了一种基于DSP芯片的频率测量系统.采用TMS320VC5502作为核心处理单元,以多周期同步测频法为理论基础,结合DSP芯片的高精时钟、快速运算的优点,实现了高精度的频率测量,并提出了进一步提高测量精度的方法.使用两个定时器和一个外部中断进行测量,DSP进行标准频率和被测频率信号的计数,并计算测频结果,发往上位机.结合实验结果进行了精度分析,测量精度达到10~(-9)数量级.

Research on Frequency Measurement System Based on DSP with High Accuracy

In order to improve measure accuracy,a frequency measure system based on DSP is introduced.The core processing unit of this system is TMS320VC5502.Based on the synchronons multi- cycle frequency measurement,and combined with the high accuracy clock and high speed processing features of DSP,a method is proposed to enhance the measure accuracy.This system uses two timers and an external interrupt of DSP.DSP counts standard frequency pulse and measures frequency pulse, calculates the result and sends the results to upper computer.Based on the results,the measure accuracy is analyzed.The measure accuracy reaches the level of 10-9.