在现代卫星通信中，有效载荷功能集成化对各模块的硬件资源消耗量提出了更高的要求，而传统频域抗干扰技术资源消耗量较大. 鉴于快速傅里叶变换(fast Fourier transform, FFT)是频域抗干扰的核心部分，提出改进的FFT实现技术，对每级FFT运算结果进行自适应截位. 该方法较常规FFT算法结构节省了大量的硬件资源，
并提高了信号频谱的动态范围，以较少的硬件资源实现了更强的抗干扰能力. 该技术已成功应用于卫星导航系统的星间链路抗干扰通信，效果良好，在当代电子信息对抗领域中亦有广阔的应用前景.
With the development of modern satellite communication, integration of the functions of the satellite payload has significantly raised requirements of the hardware costs. This paper proposes an improved FFT algorithm that uses self-adapting truncation at each level of the FFT process to achieve a lager dynamic range of the signal’s spectrum as compared to the conventional FFT implementation. The improved algorithm has been applied in an inter-satellite link of a satellite navigation system with good anti-jamming performance, large dynamic range, and low complexity.
[1]. GHAFFAR R, KNOPP R. Spatial interference cancellation algorithm [C]//IEEE Wireless Communications and Networking Conference, WCNC-2009, Apr 2009: 1-5.
[2]. BERNER S, DE LEON P L. Subband transforms for adaptive, RLS direct sequence spread spectrum receives [J]. IEEE Trans. on Signal Processing, 2005. 53 (10): 3773-3779.
[3]. 张兴军，韩冰，刘建中. 直接扩频序列卫星信号的抗干扰性能分析 [J]. 无线电工程， 2009, 32(2): 452-459.
Zhang Xingjun, Han Bing, Liu Jianzhong. Analysis on anti-interference performance of DSSS satellite signal [J]. Radio Engineering of China, 2009,32(2): 452-459. (in Chinese)
[4]. Ouyang, X.; Amin, M.G. Short time Fourier transform receiver for nonstationary interference excision in direct sequence spread spectrum communications [J]. IEEE Transactions on signal Processing, 2001, 49 (4): 851-863.
[5]. 郭黎利，殷复莲，卢满宏. DSSS/CDMA 系统窄带干扰抑制技术概述[J]. 电子学报， 2009，37(10): 2248-2257.
GUO Lili, YIN Fulian, LU Manhong. Overview on NBI suppression of DSSS/CDMA systems [J]. Acta Electronica Sinica, 2009, 37(10): 2248-2257. (in Chinese)
[6]. HUANG G S, YI Z R, ZHU Z C. A combined scheme of narrow-band interference suppression for satellite spread-spectrum communication system [J]. Journal of the Graduate School of the Chinese Academy of Sciences, 2010, 27(5): 657-663.
[7]. 黄国胜，黎族华，易争荣，帅涛，朱振才. 一种基于MLBT的变换域窄带干扰抑制技术 [C]//CSNC2010第一届中国卫星导航学术年会, 2010.
[8]. 曾祥华. 扩频系统频域窄带干扰抑制算法加窗损耗研究川 [J]. 电子与信息学报，2004, 26(8): 1276-1281.
ZENG Xianghua. Study on windowing degradation of frequency-domain narrowband interference suppression algorithms in spread spectrum system [J]. Journal of Electronics and Information Technology, 2004, 26(8): 1276-1281. (in Chinese)
[9]. JONES W W, JONES K R. Narrowband interference suppression using filter-bank analysis/ synthesis techniques [C]// IEEE Military Communication Conference, 11-14 Oct 1992, 3: 898-902.
[10]. 韩其位，曾祥华，李峥嵘，王飞雪. 卫星导航干扰监测技术的发展现状与趋势 [J]. 航天电子对抗，2010, 25(6): 17-19.
HAN Qiwei, ZENG Xianghua, LI Zhengrong, WANG Feixue. Recent development and prospect of interference monitoring for GNSS bands [J]. Aerospace Electronic Warfare, 2010, 25(6): 17-19. (in Chinese)
[11]. 程佩青. 数字信号处理教程 [M]. 2版. 北京：清华大学出版社，2004.
