CAJ | 학술논문

阵列孔径损失和计算复杂度大是近场源参数估计面临的两大亟待解决的问题，提出一种类似NEST阵列模型的新模型，利用四阶累积量扩展阵列孔径，使可估计信源个数远远大于实际阵元数；并结合基于特征方程算法（characteristic equation-based method，CEM）思想避免特征值分解和谱峰搜索，极大降低了算法的计算复杂度。最后，基于已获得的近场源的角度信息，估计出所有近场源的距离信息。理论分析和实验仿真结果表明，在保证参数估计精度的前提下，所提算法的计算复杂度低，具有较高的阵列利用率，并且可以避免二维参数配对。
진렬공경손실화계산복잡도대시근장원삼수고계면림적량대극대해결적문제，제출일충유사NEST진렬모형적신모형，이용사계루적량확전진렬공경，사가고계신원개수원원대우실제진원수；병결합기우특정방정산법（characteristic equation-based method，CEM）사상피면특정치분해화보봉수색，겁대강저료산법적계산복잡도。최후，기우이획득적근장원적각도신식，고계출소유근장원적거리신식。이론분석화실험방진결과표명，재보증삼수고계정도적전제하，소제산법적계산복잡도저，구유교고적진렬이용솔，병차가이피면이유삼수배대。
Loss of the array aperture and complicated computation have always been serious problems for parameter estimation of the near-field sources.A new array model is proposed which is similar to the NEST ar-ray model,using the forth-order cumulation to extend the array aperture.The number of sources estimated by the proposed algorithm is thus much larger than the number of actual arrays.Moreover,we combine the idea of the characteristic equation-based method (CEM)to avoid eigenvalue decomposition and spectrum peak search, greatly reducing the complexity of computation.Finally,based on the angle information of near-field sources, the range information of near-field sources is estimated.Theoretical analysis and simulation results show that on the premise of the accuracy of parameter estimation,the proposed algorithm has lower computational complexity and higher utilization of arrays,which also avoids two-dimensional parameter matching.