修正的ISM频域宽带卫星波束成形  

Modified ISM-based frequency domain broadband satellite beamforming

作　　者：高翔[1] 李勇[1] 包建荣[2,3] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072 [2]东南大学移动通信国家重点实验室,江苏南京210096 [3]杭州电子科技大学信息工程学院,浙江杭州310018

出　　处：《哈尔滨工程大学学报》2017年第12期1957-1963,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(61471152);浙江省自然科学基金项目(LZ14F010003);东南大学移动通信国家重点实验室开放研究基金项目(2014D02)

摘　　要：为了解决现有宽带卫星自适应波束成形存在相干信号源导致的波束成形复杂、频带信号信息无法充分使用、信源方位估计效果差等缺陷,本文提出了一种修正的非相干信号子空间方法(incoherent signal-subspace method,ISM)的频域宽带卫星波束成形算法。基于ISM算法,所提出的修正ISM算法运用修正多信号分类算法在子带对波束信号作谱估计改进,通过接收数据矩阵前向-后向空间平滑去相关处理,使其有效克服宽带信源相关性,获得了较好宽带波束成形效果。仿真结果表明:该算法可有效实现相关信号的宽带波束成形,并克服宽带干扰和自相关信号的波束成形等问题,从而取得了较高分辨率的优异性能。To solve several deficiencies, such as complex beamforming caused by the coherent signals, inade- quate information from the passband signals, and difficulties of accurate source location pre-estimation in the current adaptive beamforming of a broadband satellite system, a frequency domain broadband adaptive beam- forming algorithm based on the modified incoherent signal-subspace method （ISM） was proposed. The pro- posed ISM algorithm used a modified multiple signal classification algorithm to improve the spectral estimation of the sub-band signals. Moreover, the coherence of the received data matrix was eliminated by the forward/ backward spatial smoothing technique, which effectively overcomes the coherence of the broadband signals and thus obtains good broadband beamforming effect. Simulation results show that the proposed algorithm can effec- tively obtain broadband beamforming of the coherent signals and solve the problems of broadband interference and beamforming of the auto-correlation signals. Therefore, it can achieve a good beamforming effect with high resolution.

关 键 词：自适应波束成形 修正ISM 线性约束最小方差准则 修正MUSIC算法 高分辨率 宽带干扰 宽带卫星 

分 类 号：TN929.3[电子电信—通信与信息系统]