An Application of Embedded Intelligence in the Automatic Tuning System for VLF Transmitter

The research focuses on the automatic tuning system for VLF (Very low frequency) transmitter using embedded intelligence, which constructs a modular architecture control system with flexibility and low cost. In this paper, the main problems of the VLF transmitting system are first analysed to determine the target of the automatic tuning system is mainly to match the output impedance of transmitter with the load impedance of antenna quickly and stably at any time. Then the matching network characteristics of the automatic tuning system are studied based on the conjugate matching principle. Besides, the implementation of the embedded control system is also given which composed of concrete design of hardware and realization of software algorithm. Finally, the embedded control system is successfully applied to the automatic tuning prototype for VLF transmitter and the experimental results verify the effectiveness of the embedded control system. (paper)