摘要
提出了基于数字信号处理器(DSP)系统的相位载波(PGC)解调的软硬件实现。针对PGC解调中混频信号与实际调制信号的频率偏差,在DSP系统实现中采用一路A/D转换器对调制信号进行同步采样,从而克服了频率偏差对解调结果的影响。结合TMS320C6201的CPU结构和片内资源,对算法实现进行了并行优化,实现了系统的实时解调。实验表明:优化后算法的运算时间显著减少,DSP解调信号与参考信号的相关系数达到0.9。
A digital implementation of PGC demodulation based on DSP system is demonstrated. To overcome the frequency offset between the mixing signal and modulating signal in PGC demodulation, an additional A/D channel in DSP system is used to sample the modulating signal. To adapt for the real-time application, the algorithm is optimized parallelly based on TMS320C6201 CPU architecture and chip resources. The experiment shows the operation time of optimized algorithm has been greatly reduced and the correlation coefficient between the reference signal and the output processed by DSP is greater than 0.9.
出处
《传感器技术》
CSCD
北大核心
2005年第8期57-59,共3页
Journal of Transducer Technology
关键词
干涉型光纤水听器
相位载波
解调
数字信号处理器
interferometric optic fiber hydrophone
phase generated carrier（PGC）
demodulation
digital signal processor （DSP）
