复杂环境下突发短帧扩频通信系统处理算法设计与综合性能仿真

Design and Integrative Performance Simulation of Burst Short Frame DS/SS System on Complicated Environment

以海上舰船和无人机控制信道为应用背景,结合某扩频通信系统的设计提出一种适合突发短帧模式的扩频通信系统设计方案。给出关键模块的实现算法分析,针对突发模式特点设计了一种频域并行伪码捕获算法,该算法采用变频率覆盖、变频率步进、变积分时间的搜索策略,使系统既能在大频偏条件下工作,又能在低载噪比条件下工作。论文还设计了一种在突发短帧模式下,能同时实现位同步和帧同步的联合同步算法。最后对设计方案进行综合性能数值仿真与分析。

Based on the missile and pilotless aircraft control channel, this paper presents a DS/SS system simulation design scheme,which is suitable for the burst mode, The algorithm of the key modules is put forward, A parallel acquisition algorithm based on frequency field is employed to Acquire PN code, And variable frequency coverage, variable frequency step and variable integral time strategy is used ,which improve the PN code synchronization performance greatly. Frequency residual error correction combined with PLL is employed for carrier synchronization, which bring a simple structure and high synchronization performance to the synchronization. Matching filter method is employed for frame synchronization ,which allows the frame synchronization is realized before symbol synchronization and it can assist symbol synchronization. At last the author carry out the simulation of the integrative performance.