【摘要】：在實際的工程應用中,各種誤差難以避免。這使得實際所得的陣列流形與采用理論解析公式計算的陣列流形差異很大,從而導致超分辨測向算法的性能惡化。陣列校正的主要目的正是抑制陣列誤差的影響,為陣列測向提供準確的陣列流形。因此,陣列校正是超分辨測向技術走向實用化的一個瓶頸,并且已成為電子偵察、雷達等諸多領域的研究熱點。本文在建立陣列誤差模型的基礎上,針對多子陣陣列、近場校準源及強干擾源,研究校正陣元位置誤差和通道幅相不一致誤差的有源校正方法。本文的主要工作如下：1.建立陣列誤差模型。首先,為了和陣列誤差模型做對比,建立理想情況下的陣列接收信號模型。然后,分別對陣元位置誤差和通道幅相不一致誤差建立數(shù)學模型、分析誤差對測向算法性能的影響。2.針對常用陣列,如均勻線陣,研究兩種常見的陣列校正方法。利用協(xié)方差矩陣的最大特征值對應的特征向量與陣列流形矢量之間的線性,介紹多輔助源校正算法；利用子空間正交的特性,介紹F-W算法。3.針對多子陣陣列,考慮校準源置于多子陣陣列的近場區(qū)域的情況,研究有源校正方法。首先,針對近場校準源,利用多子陣陣列中子陣之間的結構特性,對該場景下的陣列誤差建立數(shù)學模型,提出一種同時校正陣元位置誤差和通道幅相不一致誤差的多子陣陣列的近場有源校正方法。4.針對強干擾源,提出一種干擾環(huán)境下天線陣列流形的測定方法。該方法利用接收信號的協(xié)方差矩陣的噪聲子空間、信號子空間以及陣列流形的第一個元素等于1等約束條件,實現(xiàn)從受到干擾的天線陣列接收信號中恢復陣列流形矢量,進而為陣列測向提供準確的天線陣列流形等目標。
[Abstract]:In practical engineering application, all kinds of errors are difficult to avoid. This results in a great difference between the actual array manifold and the array manifold calculated by theoretical analytical formula, which leads to the deterioration of the performance of the super-resolution direction finding algorithm. The main purpose of array correction is to suppress the effect of array error and to provide accurate array manifold for array direction finding. Therefore, array correction is a bottleneck of super-resolution direction-finding technology and has become a research hotspot in many fields, such as electronic reconnaissance, radar and so on. Based on the establishment of array error model, the active correction method for position error of array elements and channel amplitude-phase inconsistency error is studied for multi-subarray array, near field calibration source and strong interference source. The main work of this paper is as follows: 1. The array error model is established. Firstly, in order to compare with the array error model, an ideal array receiving signal model is established. Then, the mathematical models of position errors and channel amplitude-phase inconsistency errors are established, and the effect of errors on the performance of direction-finding algorithm is analyzed. For common arrays, such as uniform linear arrays, two common array correction methods are studied. By using the linearity between the eigenvector corresponding to the maximum eigenvalue of the covariance matrix and the array manifold vector, the multi-auxiliary source correction algorithm is introduced, and the F-W algorithm .3 is introduced by using the orthogonality of the subspace. The active correction method is studied for multi-subarray array in which the calibration source is placed in the near-field region of the multi-subarray array. Firstly, according to the near field calibration source, the mathematical model of array error in this scenario is established by using the structural characteristics of the multi-subarray array neutron array. A near field active correction method for multisubarray array is proposed, which corrects the position error of array elements and the error of channel amplitude and phase inconsistency simultaneously. A method of antenna array manifold measurement under interference environment is proposed for strong interference sources. Using the noise subspace of the covariance matrix of the received signal, the signal subspace and the first element of the array manifold equal to 1, the method realizes the recovery of the array manifold vector from the received signal of the disturbed antenna array. And then provide accurate antenna array manifold and other targets for array direction finding.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN911.7

【參考文獻】

相關博士學位論文 前1條

1 陳德莉;波達方向估計中陣列誤差校正技術研究[D];國防科學技術大學;2008年

，

本文編號：2126359