【摘要】 在输电线路无源干扰研究中,经常需进行宽频带的线路散射场扫频计算,而当前各类算法每次只能计算单个频点,现有计算机硬件条件无法解决短波及以上宽频带计算问题。针对该问题,提出了利用矩量法求得若干采样点的散射场信息,将基于模型的参数估计技术应用于类似于输电线路的电大尺寸散射体频率响应内插求解的思想。以IEEE研究频段和调幅广播收音台站工作频段为例,分别建立输电线路无源干扰直线模型和线–面混合模型,结合矩量法求解出等间隔采样点的散射场,选择Padé有理函数对各频带的散射场进行插值,从而快速预测出输电线路散射场的频率响应近似值。研究表明,MBPE技术插值精度与采样点数量、位置有关,若采样点选择恰当,其全局极值最大相对偏差可不超过4%。更多还原

【Abstract】 In the research of reradiation interference from power transmission line, the scattered fields of power line on wide frequency band are often calculated by swept-frequency method. Nevertheless, the calculation on wide frequency band of short-wave and above cannot be solved under the existing computer hard ware conditions, because the various algorithms can only calculate one frequency point. In this paper, the model-based parameter estimation(MBPE) technique was proposed to deal with this problem. Firstly, the scattered field information of sampling points were calculated with method of moments(Mo M), therefore, the scattering characteristic of power transmission line could be acquired by interpolation fitting. Take the frequency band studied by IEEE and the operating frequency band of AM broadcast radio stations for examples, the scattered fields of sampling points with equally spaced frequency were respectively calculated corresponding to the wire model and the wire-surface model. The Padé rational function was selected to interpolate the variation of scattered field. As a result, the approximate values of scattered fields on wide-band frequency could be quickly predicted. The research shows that, the fitting accuracy of MBPE technique is correlated with the numbers and locations of sampling points, and the maximum relative error for extreme points can be under 4% with appropriate sampling points.更多还原