摘要
在多业务并发与载波同步精度要求下,数字调幅中波广播系统对发射机运行维护策略提出高频谱完整性与调制度连续性并重的技术要求。分析10 kW数字调幅中波广播发射机主备切换时出现的信噪比突降与相位漂移问题,研究基于神经网络建模的智能预失真校正技术与多节点闭环反馈机制,提出高精度相位一致控制与同步周期结构基准脉冲同步触发体系。案例实证结果表明,所构建方案在中波信号信噪比保持性、载波同步时序控制及调制度连续谱域收敛方面展现出优良的工程匹配性能。
Under the requirements of multi-service concurrency and carrier synchronization accuracy,digital amplitude modulation medium wave broadcasting systems pose technical requirements to the operation and maintenance strategies of transmitters,emphasizing both high spectral integrity and modulation system continuity.This paper analyzes the problems of sudden drop in signal-to-noise ratio and phase drift that occur during the primary and backup switching of a 10 kW digital amplitude modulation medium wave broadcast transmitter,studies the intelligent predistortion correction technology based on neural network modeling and the multi-node closedloop feedback mechanism,and proposes a high-precision phase consistency control and synchronous periodic structure reference pulse synchronous triggering system.The empirical results of the case study show that the constructed scheme demonstrates excellent engineering matching performance in terms of the retention of the signal-to-noise ratio of the medium wave signal,carrier synchronous timing control,and the convergence of the continuous spectral domain of the modulation system.
作者
李卓
LI Zhuo(Fangchenggang Branch of Guangxi Radio and Television Technology Center,Fangchenggang 538021,China)
出处
《电视技术》
2025年第11期130-132,150,共4页
Video Engineering
关键词
数字调幅
中波广播发射机
双机无缝切换
digital amplitude modulation
closed-loop feedback
seamless dual-transmitter switching
