基于瞬时相位差分特性的数据传输系统丢点检测方法

针对数据传输系统丢点问题,依据连续正弦信号瞬时相位差分特性,探讨了一种自动检测数据传输系统丢点方法。首先在数据传输系统采集前端加入正弦信号;然后将解包好的数据通过希尔伯特变换求取数据瞬时相位,并从前向后进行相位补偿,使数据瞬时相位呈连续递增形式;最后通过相位差分法求得瞬时相位前向差分。由理论分析可知:连续正弦信号未丢点时,当前位置数据相比前一位置数据相位差为2πfc/fs(fc为正弦信号频率,fs为数据传输系统采样率);连续正弦信号丢点时,当前位置数据相比前一位置数据相位差为2πfc(n+1)/fs(n为传输数据丢失点数)。由此特性,可实现对数据传输系统是否丢点实现自动检测。理论分析和实验结果表明,探讨的数据传输系统丢点检测方法可实现对数据传输系统是否丢点实现自动检测,便于工程应用。

Detection Method of Data Transmission System Losing Points Based on Instantaneous Phase Difference Feature

According to instant aneous phase difference feature of continuous sinusoidal signal,an automatic detection method is proposed with regard to the problem of data transmission system losing points in this paper. First,sinusoidal signal is added in the entrance end of data transmission system. Then instantaneous phase of unpacked data through Hilbert transform is obtained,carrying out phase compensation from first to last for all instantaneous phase,and making instantaneous phase continuously increase. Finally before the instantaneous phase difference is obtained. According to theory analysis,we can get that when continuous sinusoidal signal does not lose points,the phase difference between the current position data and the previous position data is 2πfc/fs (fc is sinusoidal signal frequency,fs is sampling rate of data transmission system),when continuous sinusoidal signal loses points,the phase difference between the current position data and the previous position data is 2πfc (n+1)/fs (n is the number of losing points). According to those,we can achieve automatically detect whether data transmission system lose points or not. Theory analysis and experimental results both show that this proposed method can automatically detect whether data transmission system lose points or not,which can be easily applied to engineering application.