Subreflector control technology was used to realize antenna electrical performance compensation for elec-trical performance degradation caused by deformation of the main reflector and subreflector of a large aperture high-frequency deep space Tracking,Telemetry and Command (TT&C)antenna.Following analysis of the mathematical model of a parallel mechanism,the forward and inverse solutions of the position and attitude of the 6-Degree Of Freedom (6-DOF)parallel mechanism were given by definition of a parallel mechanism coordinate system.Then, according to the deformed shape,the relationship between the position and attitude of subreflector and the pitch an-gle was given using parabolic fitting method,and the best working point of the subreflector position and attitude were found out against the pitch angle in realtime motion process.Finally,control of the subreflector to the best po-sition and attitude was realized by the 6-DOF parallel mechanism forward and inverse solutions and control algo-rithm.Theoretical analysis and engineering practices show that the control technology of the subreflector can achieve effective compensation for antenna electrical performance by controlling the centre point of the subreflector to reach the best position and attitude.Strong bearing capacity and flexible control features of position and attitude and the 6-DOF parallel mechanism of the subreflector can achieve realtime precise control.
deep space TrackingTelemetry and Command (TT&C)subreflector6-Degree Of Freedom (6-DOF) parallel mechanisminverse solution of positionforward solution of position
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