【摘要】 针对零中频接收机的卫星通信应用,文中首次将频域移位平均周期图法应用于零中频接收机,利用该算法工作信噪比低、估计范围大的优点,扩展了零中频接收机的载波捕获范围,并对算法中补零倍数的定义进行了修改。仿真结果表明,在信噪比大于2 d B,经典高动态模型的通信环境中该算法可使接收机达到90%捕获概率,且捕获时间不大于1.2 s。更多还原

【Abstract】 Focusing on extending the application of Zero-IF receivers on satellite communication, the average periodogram algorithm in frequency domain is used in carrier acquisition process of Zero-IF receivers to extend the acquisition scope. And some parameters of the algorithm are corrected in this paper. The simulation denotes: the algorithm can make sure the Zero-IF receiver’s acquisition ratio reach 90% when SNR >2 d B and Doppler frequency bias and derivate satisfies the classical dynamic model, and the carrier acquisition time is less than 1.2 s.更多还原