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一种稳健的自适应波束形成算法 总被引:1,自引:0,他引:1
一般自适应波束形成的主瓣和零陷比较尖锐,当存在指向误差,干扰信号或天线平台快速运动时,若实时处理速度跟不上,将导致干扰抑制能力下降,采用高速处理算法代价太大.本文研究了利用导数约束法来改进广义旁瓣相消器的稳健性,对信号的自相关矩阵进行改进,使主瓣和零陷展宽,仿真试验表明该方法对指向误差和当干扰或天线平台快速运动时都具有很好的稳健性. 相似文献
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自适应波束形成技术能有效地接收目标信号并抑制干扰,是阵列信号处理中的一项关键技术。为了应对快速运动干扰或平台转动等引起的自适应权值和数据失配,增强算法的鲁棒性,可以采用零陷展宽技术。通过Capon谱重构干扰加噪声协方差矩阵,可以根据需要设置零陷宽度和零陷深度,从而大大地提高算法的鲁棒性。通过与现有算法的比较,该方法能得到更高的输出信干噪比,并且能加深零陷深度,需要的快拍数也较少。 相似文献
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自适应波束形成技术是智能天线领域的核心技术,其利用自适应波束形成算法,根据用户的空域信息来产生空间定向波束,将波束的主瓣对准期望用户的来波方向,旁瓣或零陷对准干扰信号的来波方向.文中介绍了一种基于DSP结合FPGA的波束形成器的实现形式,该系统能够实时地处理数据,并很好地完成预定指标. 相似文献
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An implementation of adaptive null steering beamformer for flexible broad null control, based on constrained recursive updating of array response zeros and spatial FIR filters, is presented. The design allows the beamformer to form broad nulls and control their widths readily. The new method is of great advantage for sensor array in which the number of array elements is very large compared with the number of interferences the array is designed to suppress. The new beamformer is useful and effective in the environment where both stationary and moving interference signals exist since it can steer both sharp and controlled broad nulls in the appropriate directions. When compared with the conventional LMS covariance matrix taper (CMT) based broad null synthesis method, the proposed beamformer has a faster convergence rate; and compared with the QR-RLS CMT based broad null synthesis method, the proposed method has a lower complexity. 相似文献
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An efficient method based on bees algorithm (BA) for the pattern synthesis of linear antenna arrays with the prescribed nulls is presented. Nulling of the pattern is achieved by controlling only the positions of selected elements. The BA is an optimization algorithm inspired by the natural foraging behavior of honey bees to find the optimal solution. Simulation results for Chebyshev patterns with the imposed single and multiple nulls are given to show the effectiveness of the proposed method. 相似文献
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Linear antenna array pattern synthesis with prescribed broad nulls 总被引:10,自引:0,他引:10
A technique of synthesizing an antenna array pattern with prescribed broad nulls is presented. The array pattern synthesis problem is formulated as a least-square null constrained optimization problem. Numerical techniques based on the matrix factorization method are developed for reducing the computational complexity of determining the optimal weight vector. Subsequently, a set of eigenvector constraints are used to approximate the effect of the quadratic constraint. Numerical results are presented to illustrate the performance achievable 相似文献
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V. A. Balagurovskiy A. S. Kondratiev A. O. Manichev N. P. Polishchuk 《Journal of Communications Technology and Electronics》2017,62(6):549-557
Two approaches to the phase-only synthesis of nulls in radiation patterns (RPs) of the phased array antenna (PAA) of a coordinate meter are considered. The approaches use the specificity of the structure of the sheet of the measuring PAA. Such a PAA forms the sum RP and two difference RPs, which ensure measuring of the angular coordinates of an object. The problem of the phase-only synthesis of pattern nulls in prescribed directions in one or several PAA RPs with the angular orientation of the nulls of difference RPs kept in the RP scanning direction is solved. Design relationships are derived and a RP synthesis method, which is based on iterative univariate minimization of a nonlinear functional and includes analytic determination of the minimum of this functional at each iteration, is described. Examples of the array pattern synthesis are presented. The effect the phasing increment on the depth of formed nulls is analyzed and the dependence of the value of the PAA RP in the scanning direction on the position of the formed null is investigated. The effect of synthesized nulls on the shape of the PAA direction-finding characteristic is analyzed. 相似文献
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Liu Hui Zhou Yinqing Xu Huaping 《电子科学学刊(英文版)》2006,23(5):795-797
I. Introduction In order to cancel the interferences from certain directions, the problem of forming nulls in the an- tenna pattern is very important. Many researches in this area of adaptive nulling systems have been done For example, the method discussed by Applebaum[1] maximizes the Signal-to-Noise Ratio (SNR) and the one presented by Drane-McIlvenna[2] maximizes the antenna gain. In most conditions, both methods can meet the requirement. However, the performance of the pattern is unsa… 相似文献
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基于一种新的遗传算法的天线方向图综合技术 总被引:16,自引:5,他引:11
给出了一种基于实数编码遗传算法的天线方向图综合方法.在遗传算法模型中采用了向下、向上外推和非一致杂交算子等交叉技术,并结合内插、交换等多种技术形成综合交叉方式.该算法克服了已有算法早熟、对初始群体依赖性等缺陷的同时,较大幅度地提高了算法的收敛速度和可靠性;通过在目标函数中加入零陷方差项克服了现有算法零陷不均衡的缺陷.计算机仿真结果表明,与现有算法相比,该方法用于天线方向图综合具有收敛速度快、零陷均衡、可靠等优势. 相似文献
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