一种基于CORDIC算法的混合跳扩频跟踪同步方法

针对传统反馈环路补偿速度无法跟上目前混合跳扩频通信系统误差变化速度导致同步失败的问题,提出一种基于坐标旋转数字算法(Coordinate Rotation Digital Computer,CORDIC)的跟踪同步方法.该方法将系统载波同步误差和定时同步误差映射到相位上,利用二维旋转的方式对误差进行补偿,并根据二进制相移键控(Binary Phase Shift Keying,BPSK)调制的性质,确定最佳旋转位和补偿误差,实现系统同步.实验证明,此方法成功让具有跳频速率20000 hop/s、跳频带宽327.52 MHz的混合跳扩频通信系统实现了稳定同步,补偿性能相比于传统补偿技术具有明显优势.

A hybrid hopping spread spectrum tracking synchronization method based on CORDIC algorithm

To solve the problem that the compensation speed of the traditional feedback loop cannot keep up with the synchronization failure caused by the error change speed of current hybrid hopping spread spectrum communication system,a tracking synchronization technology based on Coordinate Rotation Digital Computer(CORDIC) is proposed.The carrier synchronization error and timing synchronization error of the system are mapped to the phase by this algorithm and compensated by two-dimensional rotation.According to the binary phase shift keying(BPSK) modulation property,the optimal rotation position and compensation error are determined to realize the system synchronization.The experimental results show that using this method,the hybrid hopping spread spectrum communication system with frequency hopping rate 20 000 hop/s and frequency hopping bandwidth 327.52 MHz can achieve stable synchronization,and the compensation performance has obvious advantages compared with that of the traditional compensation technology.