太赫兹科学与电子信息学报2024，Vol.22Issue(3)：269-277,9.DOI:10.11805/TKYDA2023440
基于二分搜索的宽带多普勒模型信号捕获方法
A signal acquisition method in wideband Doppler model based on binary search
摘要
Abstract
In the ultra-high dynamic and low Signal-to-Noise Ratio(SNR)communication scenarios like deep space communication,traditional signal acquisition methods suffer from inadequate dynamic range support,insufficient accuracy,and the use of a narrowband Doppler model leading to poor approximation accuracy in the received signal.A wideband Doppler model is employed to model the received signal and a chirp signal is used for Doppler estimation and timing estimation.A sampling rate adjustment method based on binary-search is proposed for the receiver to overcome the mismatch between the Doppler-stretched signal and the local signal sampling rate.The simulation results of the synchronization performance show that the proposed method using Up-Down Linear Frequency Modulation(UD-LFM)signal is capable of achieving a Doppler estimation error below 400 Hz and a timing estimation error below 60 ns under a SNR of-49 dB and a maximum Doppler frequency of 2 MHz.Compared to direct acquiring,the proposed method bears a higher acquisition accuracy and a lower SNR threshold.关键词
超高动态/宽带多普勒模型/低信噪比/扫频余弦信号/信号捕获Key words
ultra-high dynamic/wideband Doppler model/low signal-to-noise ratio/chirp signal/signal acquisition分类
信息技术与安全科学引用本文复制引用
郭孟泽,付学瀚,朱立东,燕贺云..基于二分搜索的宽带多普勒模型信号捕获方法[J].太赫兹科学与电子信息学报,2024,22(3):269-277,9.基金项目
国家自然科学基金资助项目(62371098) （62371098）
