航空HF电台测试系统跳频信号源的实现

Implementation to the signal generator of frequency hopping for the test system of an airborne HF station

航空HF电台是航空通信系统的重要组成部分,担负着空空、空地之间的远程通信,关系到空空、空地之间的通信安全。通过分析航空HF电台测试和控制需求,提出基于"DDS+PLL"的检测仪跳频信号源的设计方案,介绍跳频信号源中频率合成单元电路工作原理和工作流程,分析跳频信号源各频率合成单元的输出频率的计算方法。测试结果表明,该跳频信号源具有频率稳定度高、频率分辨率高、抗干扰能力强和频率转换时间短等优点。

As one of the most important part of airborne communication system, the station is responsible for long-distance communication of A-A and A-G and relates to the security of A-A and A-G communication. The requirements of test and control for the station is analyzed in this paper, according to which, a scheme of frequency-hopping signal generator based on＂ DDS ＋ PLL＂ for its test equipment is developed. The operation principle and process of the frequency synthesizer in the signal generator is also presented, including the method of calculating its output frequency. The test results show that our signal generator has the advantages of high frequency stability, desirable frequency solution ratio, noise immunity and short switching time.