航空通信设备检测系统跳频信号源的设计

Design of frequency-hopping signal source for airborne communication equipment test system

跳频通信被称为无线电的"杀手锏"武器,越来越多的航空电子设备采用跳频通信体制,为保证跳频通信设备性能,需要研制跳频信号源对其进行检测。在分析某航空通信设备测试和控制需求的基础上,提出基于"DDS+PLL"的跳频信号源的设计方案。具体介绍了利用MC145158和AD9850实现系统硬件组成,给出了硬件原理框图,详细分析了跳频信号源中频率合成单元电路工作原理和工作流程,同时介绍了频率合成单元的软件工作流程。测试结果表明,该跳频信号源频率分辨率小于1 Hz、频率转换时间小于1μs。

Frequency-hopping communication is known as a ＂killer＂ weapon in the radio field, more and more avionics use frequency-hopping communication system, in order to ensure that frequency-hopping devices performance well, which needed to be tested with frequency-hopping signal source. Based on the analysis of a aeronautical communications equipment, a scheme of frequency-hopping signal generator based on ＂DDS ＋PLL＂ is developed. The hardware system which used MC145158 and AD9850 is introduced in detail, the hardware block diagram of this system is given. The frequency-hopping signal source in the synthesis of cell circuit working principle is analyzed, at the same time, the working flow of software that developed for frequency synthesis unit is also introduced. Test results show that the frequency-hopping signal source with a frequency resolution is less than 1Hz and the frequency conversion time is no more than 1μs.