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High‐Precision Carrier Tracking Algorithm for Extremely Weak and High‐Dynamic Signals
Radio Science ( IF 1.6 ) Pub Date : 2021-04-23 , DOI: 10.1029/2021rs007277
Tao Deng 1, 2 , Maoli Ma 1 , Qinghui Liu 1 , Yajun Wu 1
Affiliation  

Obtaining high‐precision Doppler frequencies for very weak and high‐dynamic signals in deep space exploration is challenging. Such signals are commonly encountered, including in soft landing of lunar probes and the entry, descent, and landing (EDL) phase of Mars probes. Phase‐locked loop (PLL) is a widely used method for measuring high‐precision Doppler frequencies. In this study, two major improvements are applied to PLL. The first is that high precision estimation of initial frequency is achieved by open loop maximum amplitude search algorithm. Second, a novel denoising method is proposed and a new type of phase detector is designed based on this new denoising method. By replacing arctangent phase detector with the novel phase detector, the tracking accuracy and weak‐signal tracking abilities of the PLL are improved. The actual data processing results of soft landing process of lunar probe further verify the excellent performance of the improved PLL.

中文翻译:

极弱和高动态信号的高精度载波跟踪算法

在深空探测中,对于非常微弱和高动态的信号,要获得高精度多普勒频率具有挑战性。通常会遇到此类信号,包括在月球探测器的软着陆以及火星探测器的进入,下降和着陆(EDL)阶段。锁相环(PLL)是一种用于测量高精度多普勒频率的广泛方法。在这项研究中,对PLL进行了两个主要改进。首先是通过开环最大幅度搜索算法可以实现对初始频率的高精度估计。其次,提出了一种新的去噪方法,并基于这种新的去噪方法设计了一种新型的鉴相器。通过用新颖的相位检测器代替反正切相位检测器,可以提高PLL的跟踪精度和弱信号跟踪能力。
更新日期:2021-05-07
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