中圖分類號：TN967.1 文獻標志碼：A DOI: 10.16157/j.issn.0258-7998.246098 中文引用格式： 宋若宇,，王振嶺，蔚小龍,，等. 一種改進的分段FFT兩級快速捕獲方法[J]. 電子技術應用,，2025，51(4)：106-109. 英文引用格式： Song Ruoyu,，Wang Zhenling,，Yu Xiaolong，et al. An improved two-stage fast acquisition method based on FFT[J]. Application of Electronic Technique,，2025,，51(4)：106-109.
An improved two-stage fast acquisition method based on FFT
Song Ruoyu1，Wang Zhenling1,，Yu Xiaolong1,，Liu Yating2
1.China Electronics Technology Group Corporation 54th Research Institute； 2.The PLA Rocket Force Equipment Department in Langfang District Military Representative Office
Abstract： The navigation enhancement signals in communication and navigation integration signals are characterized by limited spectrum resources and non-continuous transmission. For the high-dynamic, short-burst navigation enhancement signals in the L-band of low-earth orbit (LEO) satellites, an improved segmented Fast Fourier Transform (FFT) two-stage time-frequency domain two-dimensional rapid acquisition method is proposed. Through the two-stage segmented coherent FFT acquisition process, the arrival time of the navigation enhancement signal and the signal Doppler shift estimation are obtained simultaneously, enabling fast and real-time signal acquisition processing in LEO scenarios. Simulation results demonstrate that when the signal carrier-to-noise ratio is above 48 dBHz, the rapid acquisition algorithm can adapt to signal Doppler shifts of ±40 kHz and accommodate short-burst transmission modes, with the signal Doppler estimation error controlled within ±80 Hz and the signal arrival time estimation error controlled within ±1 chip.
Key words : communication and navigation integration,；high dynamic,；short burst；FFT,；segment correlation,；fast acquisition
