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System Identification of the IDSN32M Antenna Control System Model

机译:IDSN32M天线控制系统模型的系统识别

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The IDSN32 Indian Deep Space Network antenna system commissioned in 2008, is installed at Byalalu, Bangalore and has provided TTC (tracking, telemetry & command) and science data reception support for India's Moon mission “Chandrayaan-I” and Mars Orbiter Mission “Mangalyaan”. The Antenna Control Servo System controls the antenna position in AZ and EL axis to the required pointing and tracking accuracies. The system is designed to meet tracking accuracy of 30mDeg in S band and 15mDeg in X band under the wind conditions of 30 kmph gusting to 45kmph. Tracking accuracy deteriorates in the presence of wind gusts; hence it is required to mitigate effect of wind disturbances to achieve better pointing and tracking accuracies that would be required at higher frequency bands. In order to achieve this, it is proposed to upgrade existing servo system (PI controller) with Advanced controllers, e.g., a Linear Quadratic Gaussian (LQG) controller. The FEM (finite element models) or analytical models due to its many uncertainties / inaccuracies, could not be used to design such controllers hence accurate antenna models are obtained through an experimental approach based on response measurements (System Identification). This paper discusses the system identification experiments carried out for the Azimuth and Elevation axis of IDSN32M Antenna in detail.
机译:IDSN32印度深空网天线系统于2008年投入使用,安装在班加罗尔的Byalalu,并为印度的月球飞行任务“ Chandrayaan-I”和火星轨道飞行器“ Mangalyaan”提供了TTC(跟踪,遥测和指挥)和科学数据接收支持。 。天线控制伺服系统将AZ和EL轴上的天线位置控制到所需的指向和跟踪精度。该系统设计为在阵风为30 kmph至45kmph的风力条件下,满足S波段30mDeg和X波段15mDeg的跟踪精度。有阵风时,跟踪精度会降低;因此,需要减轻风干扰的影响,以获得更高的指向和跟踪精度,这在更高的频段上是必需的。为了实现这一点,建议用高级控制器,例如线性二次高斯(LQG)控制器升级现有的伺服系统(PI控制器)。由于FEM(有限元模型)或分析模型存在许多不确定性/不准确性,因此无法用于设计此类控制器,因此,可以通过基于响应测量(系统识别)的实验方法获得准确的天线模型。本文详细讨论了针对IDSN32M天线的方位角和仰角轴进行的系统识别实验。

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