【摘要】 在双向工频自动通信系统(TWACS)应用中,传统的时域检测方法由于提取的信号特征有限,在强噪声条件下无法进一步提高检测的正确率.为此,从频域滤波的角度给出了一种新的改进时频分析算法,该算法具有较高的时频分辨率和交叉项抑制能力,并且有很高的计算效率,可满足TWACS通讯的实时性要求.采用改进时频分析算法对实际电网信号分析的结果表明:该方法能够高效、准确地实现TWACS调制信号的检测.更多还原

【Abstract】 In Two Way Automation Communication System(TWACS) applications,the detecting accuracy can not be improved in the environment with strong noise using the traditional time-domain detection algorithm due to the characteristic limitation of the detected signal.A new improved time-frequency analysis algorithm is presented in terms of the frequency-domain filtering.This algorithm has a high time-frequency resolution and can reduce or even completely remove the cross-term.More importantly,the algorithm has an excellent computation efficiency to meet the requirement of the real-time working of the TWACS.After detecting and analyzing the actual signal from the power distribution network,the results shows that the algorithm can detect the TWACS modulated signals efficiently and correctly.更多还原