| 摘要: |
| 针对空间探测任务中采用雷达散射截面积（RCS）序列估计卫星旋转周期存在的问题，建立了基于多频段RCS的卫星自旋周期估计分析模型。根据卫星的外推弹道，计算了卫星的可跟踪弧段，推导了自旋模式下卫星本体坐标系下电磁波入射角的计算公式。采用电磁场数值算法快速计算卫星的RCS，通过RCS匹配获得卫星可跟踪弧段的理论RCS序列，研究了自旋周期在RCS序列中的表现形式。仿真分析了雷达频段、采样率及弧段选择对周期估计的影响，结果表明入射角序列相对于垂直于卫星自旋轴方向变化平稳的弧段，RCS序列呈现的周期性特征显著，利用该类弧段进行卫星自旋周期估计可以得到准确的结果，证明该方法可以应用于卫星自旋周期估计。 |
| 关键词: 空间探测 卫星自旋周期 RCS精确预估 轨道外推 |
| DOI：10.3969/j.issn.1001-893x.2017.09.005 |
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| 基金项目:国家自然科学基金资助项目（61372033） |
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| Estimation of satellite self-spin period by using RCS sequence |
| JI Weijie1,ZHONG Weijun2 |
| (1.Air Force Xi′an Flight Academy,Xi′an 710306,China;2.Xi′an Satellite Control Center,Xi′an 710043,China) |
| Abstract: |
| To solve the problem in satellite self-spin period estimation based on the radar cross section（RCS）sequence in space detection missions,a satellite self-spin period estimation model based on multi-frequency band RCS is built. According to the satellite extrapolation orbit,the trackable arcs of satellite for station tracking are obtained. The electromagnetic numerical algorithms are applied to compute the RCS of satellite rapidly and the formula for calculating the incident angle of electromagnetic wave transmitted by earth-based radar in satellite coordinate system is derived,then the theoretical RCS sequences of trackable arcs can be obtained. The expression of self-spin period in RCS sequence is studied,and the factors of radar frequency band,sampling rate and arc selecting which influence self-spin period estimation are analyzed. The results show that,because of the RCS sequences’ obvious periodicity,the arcs whose incidence angle changes relative to the spin axis is perpendicular to the satellite smooth can be used to estimate satellite spin cycle accurately,and the method in this paper can be applied to estimate the satellite self-spin period. |
| Key words: space detction satellite self-spin period RCS precise prediction orbit extrapolation |
