基于频带分解的中波发射机播出信号失真故障检测方法  

Detection method of Distortion Fault of Broadcast Signal of Medium Wave Transmitter Based on Frequency Band Decomposition

作　　者：曲珍 QU Zhen(Tibet Autonomous Region Radio and Television Bureau Xiachayu Medium Wave Relay Station,LinZhi Tibet 860000)

机构地区：[1]西藏自治区广播电视局下察隅中波转播台,西藏林芝860000

出　　处：《中国科技纵横》2023年第24期84-86,共3页China Science & Technology Overview

摘　　要：在检测信号失真故障的过程中,受信号本身连续性和重叠性的影响,检测结果与实际信号失真故障状态存在较大差异,因此提出基于频带分解的中波发射机播出信号失真故障检测方法研究。在中波发射机信号频带分解结构设置阶段,构建包含数字滤波器组和模拟滤波器组的分解构成,并考虑到采样率的实际执行范围与理想参数之间的差异,每一路DAC的采样率进行迭代设置,由此将原始重叠中波发射机信号分解为相对独立的形式;在信号失真故障检测阶段,对信号进行傅里叶变换处理,借助窗函数将原始连续中波发射机信号分解为若干个间隔形式,通过计算分解后信号与所在时域允许信号波动范围之间的关系,实现对信号失真故障的检测。在测试结果中,设计检测方法对于信号基波特征值、谐波特征值和高阶能量特征值的检测结果与标准曲线的偏离程度均为1.0以内。In the process of detecting signal distortion faults,there is a significant difference between the detection results and the actual signal distortion fault state due to the influence of the continuity and overlap of the signal itself.Therefore,a method for detecting signal distortion faults in medium wave transmitters based on frequency band decomposition is proposed.In the stage of setting the frequency band decomposition structure of the medium wave transmitter signal,a decomposition composition consisting of digital filter banks and analog filter banks was constructed.Considering the difference between the actual execution range of the sampling rate and the ideal parameters,the sampling rate of each DAC was iteratively set,thereby decomposing the original overlapping medium wave transmitter signal into relatively independent forms;In the phase of signal distortion fault detection,the signal is processed by Fourier transform,and the original continuous medium wave transmitter signal is decomposed into several interval forms by window function.The signal distortion fault detection is realized by calculating the relationship between the decomposed signal and the allowable signal fluctuation range in the time domain.In the test results,the deviation between the detection results of the designed detection method for the fundamental wave eigenvalues,harmonic eigenvalues,and higher-order energy eigenvalues of the signal and the standard curve is within 1.0.

关 键 词：频带分解 中波发射机 信号失真故障 采样率 傅里叶变换 时域 

分 类 号：TN606[电子电信—电路与系统]