摘要
介绍了常用的相位差算法过零检测法、数字相关法和FFT算法,对这三种算法的测试表明,三者均能在几十微秒量级的延时内较准确地获得计算结果,但所需的资源和时间开销有所不同。过零检测法占用的资源较多,但平均计算延时较小;FFT资源占用率和延时均较大;而数字相关法资源占用率和延时均较小,但相位翻转的判断存在困难。
To calculate the phase shift, zero-crossing detection, digital correlation method and FFT are commonly used. Tests on the three algorithms show that, they can obtain phase shift accurately in dozens of microseconds delay, but resources and time cost are different. Zero-crossing detection needs more resources, but less time. FFT has large resource occupancy and latency. Digital correlation method is just the opposite to FFT, but detecting phase reverse is difficult.
出处
《核聚变与等离子体物理》
CAS
CSCD
北大核心
2015年第4期308-313,共6页
Nuclear Fusion and Plasma Physics
基金
国家磁约束核聚变能发展研究专项(2013GB113003)
中央高校基本科研业务费资助(0118131089)
关键词
相位差
过零检测法
数字相关法
FFT
NI FlexRIO
LabVIEW FPGA
Phase shift
Zero-crossing detection
Digital correlation method
FFT
NI FlexRIO
LabVIEW FPGA
