CAJ | 학술논문

在卫星接收机中，数字锁相环的设计对通信系统的性能起着重要的作用。目前，低轨卫星接收机通常工作在高动态和低信噪比条件下，锁相环的收敛性能变差。该文给出了一种工作在高动态与低信噪比条件下的由FFT变换辅助的快速跟踪方法，并且比较了不同的跟踪方法的跟踪性能与时间。
재위성접수궤중，수자쇄상배적설계대통신계통적성능기착중요적작용。목전，저궤위성접수궤통상공작재고동태화저신조비조건하，쇄상배적수렴성능변차。해문급출료일충공작재고동태여저신조비조건하적유FFT변환보조적쾌속근종방법，병차비교료불동적근종방법적근종성능여시간。
In the satellite receivers, the digital phase-locked loops design plays a important role to communication systems. Now, low-orbit satellite receivers usually work in the conditions of high dynamic and low SNR, the convergence performance of phase-locked loops becomes terrible. In this paper, a FFT-assisted fast tracking method working in the conditions of high dynamic and low SNR is given, and different methods are compared.