高分辨频率估计的数字信号处理系统设计

Design of DSP System for High Resolution Frequency Estimation

介绍了以高速数字信号处理芯片ＴＭＳ３２０Ｃ３０为核心的数字信号处理系统。该系统具有１２位高速Ａ／Ｄ转换，转换时间８００ｎｓ。ＡＤ工作方式采用连续时间采样，不需ＣＰＵ干预，可进行全速转换，同时还具有８＋４位高速双通道Ｄ／Ａ输出，８位输入输出数据接口，６４ＫＲＡＭ，其中８ＫＲＡＭ与ＰＣ机共用构成主从工作方式，系统采用子空间旋转不变法（ＥＳＰＲＩＴ）估计频率。文中给出了系统原理及硬件设计框图、高分辨频率估计算法及Ｃ３０机器语言设计思想，最后给出了系统实验结果。

Describes a DSP (digital signal processing) system based on the high speed DSP chip TMS320C30. The system includes a 12 bit A/D converter, whose convert time is 800 ns. With the continue sampling mode, the A/D can work at the full speed. Meantime, the system includes a dual 12 bit DAC, 8 bit input/output data ports, 64K RAM in which 8K RAM are shared with PC to form a master slave system. ESPRIT algorithm is used to estimate signal frequency of the system. This paper gives the system principle, the hardware design diagram, the algorithm of frequency estimation and the assembly software design idea. Finally, experimental results of the system are provided.