散射通信中的校频技术研究

Research on Frequency Compensation in Troposcatter Communication

由于对流层散射信道存在严重的衰落现象,故而传统的锁相环机制在散射通信中往往难以奏效。针对此问题,提出了基于提载滤波器幅频特性的校频技术和基于CORDIC算法的校频技术,详细阐述了这2种技术的工作原理及具体实现方案,并对这2种校频技术分别进行了评估,给出了基于CORDIC算法的校频技术在信道模拟仪上的测试数据和结论。

Because of the fading characteristic in troposcatter channel,the mechanism of traditional phase locked loop is difficult to achieve the effect in troposcatter communication.Aimed at this problem,the technology of frequency compensation based on frequency-amplitude characteristic of filter used to improve the SNR of carrier and the technology of frequency compensation based on CORDIC algorithm are proposed in this paper.These two technologies in theory and realization are described in detail.Finally,the important testing data obtained from the channel emulator and the conclusion based on CORDIC algorithm are given in this paper.