采用前馈定时同步的解调器设计与实现

无人机数据链系统中的解调器常用反馈结构实现定时同步,而无人机起降阶段多径十分严重,采用反馈定时同步的解调器工作不稳定。针对这个问题,分析比较了反馈式和前馈式2种定时同步方法的原理,选择前馈式定时同步方法设计实现了一种用于无人机起降阶段的解调器;介绍了前馈式定时同步的算法选择和参数设计过程,并阐述了解调器的工作原理和硬件组成。经测试和实际工程验证,解调效果良好。

Design and Realization of Demodulator Using Feedforward Timing Synchronization

The feedback timing synchronization is often used in the demodulator of UAV datalink system, but in the arrival and takeoff scenario,because of severe multipath fading, the operation of demodulator using feedback timing synchronization is unstable. Aimed at this problem, the paPer gives an analysis and comparison on the principle between feedback and feedforward timing synehronization,a demodulator which works in arrival and takeoff scenario is designed and realized by using feedforward timing synchronization method. The selection of algorithm and the design of system parameter are also introduced in the paper, as well as its working principle and composition of hardware. The test and project result show the effect of demodulation is well.