基于修正模型的天线指向误差统计特性分析

Study on the statistical characteristics of pointing error for an antenna based on the correction model

摘要:

作为评估天线性能的重要指标之一，天线指向精度直接影响着天线的跟踪观测性能。为了适应任务需求，提高天线及星地链路分析精度，本文基于指向误差修正模型对模型各分量的影响因素含义进行了系统分析，并定量研究了各个分量对指向误差的影响。基于各模型参数的分布特性，提出了一种指向误差概率分布模型，进一步完善了天线指向误差分析计算方法，最后利用天线的典型参数分析计算了天线指向误差角近似满足修正瑞利分布下的特征，可为后续星地链路统计分析提供参考依据。

Abstract:

As one of the most important characteristics, the pointing accuracy of the antenna directly affects the observation and tracking performance of the antenna. In order to meet the task requirements and improve the analysis accuracy of antenna and satellite ground link, this paper systematically analyzes the meaning of influencing factors of each component on pointing error. Based on the distribution characteristics of the model parameters, a probability distribution model of antenna pointing error is proposed, which can be used to improve the analysis method of antenna pointing error. Finally, the characteristics of antenna pointing error angle under the approximate modified Rayleigh distribution are analyzed and calculated by using typical parameters, which can provide a reference for the subsequent statistical distribution analysis of satellite ground link.