改善自动频率跟踪调整系统性能的一种新方法

A New Method for Improving Performance of Automatic Frequency Tracking and Regulating System

为克服传统模拟式自频调系统跟踪调整范围较窄、死区不能满足调整精度要求的缺点，提出并实现了一种利用积累频率偏移量鉴别频偏的脉宽鉴别式自频调系统，给出了理论分析和工程实现的经验公式。分析与实践表明，该系统跟踪范围大、死区小，特别适用于跳频精度不高，对调整范围要求宽而又不能降低调整精度场合。

To enlarge the range and to reduce the dead zone, an automatic frequency tracking and regulating system, using a new method of time pulse width discrimination in which the frequency deviation integration is transferred into the width, has been designed and implemented. Based on the analysis of the performance, the formula for designing a frequency tracking and regulating system with a wide range and a small dead zone has been preferred. The results show that its effect is better than that of analog system, it is especially suitable for the system that needs lower accuracy of frequency hopping and a wide regulating range and a small dead zone.