摘要
在硬件端完成MIT测量数据的相位解调以期降低硬件与计算机间的数据传输负担和减少相位检测时间。通过对数字信号处理器(DSP)芯片的编程,实现正交序列相位解调算法,并分别对两路无噪声仿真信号和由任意波形发生器产生的实际信号进行相位解调。两种模拟MIT测量信号的相位解调结果与设定相位差的相关系数均超过0.998,单次鉴相耗时约为0.048 s。基于DSP的MIT相位解调方法有效可行。
To relax the burden of data transmission from the hardware to the computer and decrease the time of detecting phase shift by demodulating the measured data of MIT in hardware. The orthogonal sequence phase demodulation algorithm was programmed in the Digital Signal Processor( DSP). Two simulated signals without noise and two real signals from the arbitrary function generator were demodulated,respectively. The correlation coefficients of two kinds of MIT measured signal was over 0. 998. The time of once phase demodulation was about 0. 048 s. Phase demodulation in DSP is feasible and valid.
出处
《生物医学工程研究》
北大核心
2015年第4期224-226,共3页
Journal Of Biomedical Engineering Research
基金
国家自然科学基金资助项目(61271101)
全军医学科研"十二五"项目(BWS11Z011)
关键词
磁感应断层成像
相位解调
数字信号处理器
数据传输
正交序列
相关系数
Magnetic induction tomography
Phase demodulation
Digital signal processor(DSP)
Data transmission
Orthogonal sequence
Coefficient of correlation
