Subjects: Astronomy >> Astrophysical processes submitted time 2021-11-12 Cooperative journals: 《天文研究与技术》
Abstract：为解决旋转编码器在大口径高精度射电望远镜使用中，对安装工艺要求极高，需要专用设备校准，且安装后需要通过一段时间的运行，建立误差修正模型进一步提升编码器精度的问题，开展了编码器快速校准方法研究。提出了一种基于粒子群算法(PSO)的旋转编码器快速校准方法。根据伺服电机恒转速运行时，角位移变化率为常量的原理，通过编码器采样数据与伺服电机恒转速参考值对比后获得编码器安装误差。利用PSO算法快速拟合误差，从而校准编码器。通过构建编码器校准方法验证平台实测，此方法可将有较高安装误差的高分辨率旋转编码器实际测量准确度恢复3~4位，为大口径射电望远镜编码器定期精度监测与修正提供一种简易方法。
Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：提出了一种单层的具有多谐振结构的微带反射阵单元,利用HFSS对其反射相位特性进行仿真分析，获得了约430°的反射相位动态范围，并且反射相位曲线的线性度较好。根据此单元设计了一个工作在Ku波段的微带反射阵，用指数渐变槽线（Vivaldi）天线作为该反射阵的馈源。仿真结果表明，在中心频率处增益可达27.1dB，半功率波瓣宽度均为4.96°，在12GHz-15.5GHz的频带内增益波动约2dB，具有较宽的频带。将此Vivaldi天线和反射阵天线进行加工测试，得到的测试结果与仿真结果吻合的较好。
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-03
Abstract： A novel single layer microstrip reflectarray element with multi-resonance structure is proposed in this paper.HFSS soft ware is used to analyze the reflect phase for the designed element.About 430皉eflect phase range is obtained with the reflect phase curve nearly linear.A microstrip reflectarray composed of the proposed element is designed for Ku band and a Vivaldi antenna is used as the feed.The results indicate that the gain reaches 27.1 dB at the center frequency,and the half power beamwidth is 4.96�The gain changes less than 2 dB in the range of 12~15.5GHz,which shows that the reflectarray has wide band.The Vivaldi antenna and the reflectarray is manufactured and tested,and a well coincide is obtained between the simulation results and the test results.
Peer Review Status:Awaiting Review
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