Ka频段车载遥感站天线伺服控制系统设计

Design of Servo Control System for Ka Band Vehicular Remote Sensing Station Antenna

针对Ka频段7.3 m车载遥感站天线高精度标校、窄波束跟踪等应用需求,提出一种多数据源融合的跟踪控制方法。该方法采用双GPS/北斗定北和太阳标校相结合的角度校准方法,提高了天线捕获概率,解决了车载站天线难捕获以及车载站转场后伺服高精度角度标校的问题;综合利用天线系统中的接收机跟踪误差数据、程序跟踪点位数据、外部引导角度数据和天线实时角度测量数据,通过自适应加权最小二乘方法进行数据融合跟踪,提高了车载站天线伺服控制系统跟踪精度和跟踪性能。测试结果表明,组合标校方法实现天线外场角度标校精度优于0.02°;多源融合跟踪与单一数据源跟踪相比,伺服控制系统跟踪误差减小了30%以上,跟踪精度优于1/15个波束宽度。验证了组合标校和多源融合跟踪方法的有效性,可用于指导大口径高频段遥感接收天线伺服控制系统设计。

For the application requirements of high precision calibration and narrow beam tracking of the 7.3 m Ka band vehicular remote sensing station antenna,a tracking control method of multi-source data fusion is proposed.An angle calibration method combining dual GPS/Beidou north determination and solar calibration is adopted,which improves the antenna acquisition probability and solves the problems that the vehicular station antenna is difficult to acquire and the servo angle calibration precision is high after vehicular station transition.This tracking control method also comprehensively utilizes the receiver tracking error data,program tracking point data,external guidance angle data and antenna real-time angle measurement data in the antenna system,and carries out data fusion tracking through the adaptive weighted least squares method,thus improving the tracking accuracy and tracking performance of the vehicular remote sensing station antenna.The test results show that the angle calibration accuracy of antenna achieved by the combined calibration method is better than 0.02°,the tracking error of servo control system is reduced by more than 30%compared with single data source tracking,and tracking accuracy is better than one fifteenth of the beamwidth,which verify the effectiveness of the combined calibration method and multi-source fusion tracking.This method can be used to guide the design of the servo control system for large aperture high band remote sensing station antenna.