基于卫星通信系统的单音干扰最佳干扰性能研究

Best Interference Performance of Single Tone Interference based on Satellite Communication System

卫星通信系统是典型的数字通信系统,单音信号能对其产生有效干扰。以采用QPSK调制及相干解调的卫星通信系统为例,分别对系统在仅有热噪声与存在单音干扰的两种情况进行研究,对误码率计算进行理论分析及数学推导,得到误码率与干扰信号频偏与相位差的关系。利用MATLAB仿真软件进行仿真,得到对卫星通信系统进行干扰时单音干扰的最佳干扰性能。卫星通信系统进行单音干扰时,频偏越大,干扰效果越差,相位差为π/4或3π/4时干扰效果最差。

The satellite communication system is a typical digital communication system,and a single tone signal can effectively interfere with it.Taking the satellite communication system using QPSK modulation and coherent demodulation as an example,the system is explored respectively in the two cases of only with thermal noise or single tone interference,and theoretical analysis and mathematical deduction of the bit error rate calculation also done to obtain the relationship of between the bit error rate and the frequency offset and phase difference of interference signal.The MATLAB simulation software is used to simulate the best interference performance of single-tone interference when the satellite communication system is interfered.When the single-tone interference to the satellite communication system is obtained,the larger the frequency offset is,the worse the interference effect is,and the interference effect is the worst when the phase difference isπ/4 or 3π/4.