CAJ | 학술논문

针对第三方侦察中卫星通信信号的载波频率高精度估计问题，提出了一种没有先验知识条件下的MPSK信号盲载频估计改进算法，推导了MPSK信号四阶循环累积量运算的简化形式，并采用循环重叠Welch功率谱粗载频估计和四阶循环累积量精估计的方法完成MPSK信号的载频估计，大幅降低了运算量。仿真实验证明了所提算法的有效性。
침대제삼방정찰중위성통신신호적재파빈솔고정도고계문제，제출료일충몰유선험지식조건하적MPSK신호맹재빈고계개진산법，추도료MPSK신호사계순배루적량운산적간화형식，병채용순배중첩Welch공솔보조재빈고계화사계순배루적량정고계적방법완성MPSK신호적재빈고계，대폭강저료운산량。방진실험증명료소제산법적유효성。
For the problem of carrier frequency high-precision estimation of satellite signal an improved blind carrier frequency estimation algorithm for satellite MPSK signals is presented in presence of unknown parame-ters . The simplified format of fourth-order cyclic cummulant is analyzed and used in order to reduce the compu-tational complexity . The circular overlap Welch spectrum is used to perform a coarse estimation and the high-or-der cyclic cummulant method is used to perform a fine estimation . Simulation results show that the new algorithm can quickly and effectively estimate the signal carrier frequency under low SNR .