航天器工程2018，Vol.27Issue(6)：63-68,6.DOI:10.3969/j.issn.1673-8748.2018.06.009
深空通信载波同步高精度FFT频偏估计算法
High Accuracy FFT Frequency Offset Estimation Carrier Synchronization Algorithm in Deep Space Communication
摘要
Abstract
Due to the characteristic of high dynamic and low signal-to-noise ratio in deep space communication, carrier synchronization algorithm based on phase-locked loop in traditional deep space transponder reliable synchronization cannot be achieved when the signal-to-noise ratio is lower than 6 dB.In order to solve the problem, a FFT frequency offset estimation algorithm based on interpolation is proposed.The unbiased estimation of frequency offset can be obtained by onetime interpolation, which is followed by binary search to improve the estimation accuracy of frequency points near spectral line.The estimation accuracy of the algorithm are simulated and the implementation and verification of the algorithm in a deep space probe transponder are given.The results show that the estimation accuracy of the proposed algorithm is better than interpolation algorithm such as parabola and Rife.When the number of binary search iterations is equal to 5, reliable carrier recovery can be achieved within the whole frequency offset estimation range.The carrier synchronization threshold of the deep space probe transponder based on the algorithm design can reach 2 dB, which is 4 dB lower than traditional transponder.关键词
深空通信/频偏估计/插值/二分搜索Key words
deep space communication/frequency offset estimation/interpolation/binary search分类
航空航天引用本文复制引用
王翠莲,李寅,禹霁阳,李珂..深空通信载波同步高精度FFT频偏估计算法[J].航天器工程,2018,27(6):63-68,6.基金项目
国家自然科学基金(61472260) （61472260）
