【摘要】 基于链接序列和软扩频技术的复合扩频系统可以同时完成扩频通信和测距任务,但存在较严重的自扰并易受系统外界窄带干扰的影响,所以其抗干扰的能力较弱.介绍了一种改进的通信测距复合系统模型,即应用基于循环谱分析法的SPECCORR TDOA估计模型,通过应用循环相关函数的特性去除非特征频率位置的干扰和噪声成分,来改进系统的抗窄带干扰的能力;并构建了matlab系统仿真平台.仿真结果证明,改进的复合系统具有强抗干扰能力,可获得6～8dB的处理增益,可较好地同时完成扩频通信和测距任务.更多还原

【Abstract】 The multiplex system based on concatenated sequences and tamed-DS system framework can finish spread spectrum communication and distance measurement simultaneously,however,it has strong self-disturbance and easily affected by the narrow-band interference outside,so it has weak anti-jamming ability.By applying the characteristics of the cyclostationary correlation function to remove the interference and noise at characteristic frequency,the anti-interference of the narrow-band in the system was improved.Meanwhile a simulation platform of matlab system was set up. The simulation results show that the improved multiplex system not only has strong anti-jamming ability (gain) but also can finish spread spectrum communication and distance measurement at the same time.更多还原