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In-flight control system stability margin assessment
In-flight control system stability margin assessment
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机译：飞行中控制系统稳定性裕度评估
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摘要
A method for in-flight stability margin assessment includes steps of: exciting a control system with a wide band spectrum excitation signal to produce in-flight data; storing the in-flight data in an on-board computer during operation of a spacecraft mission; downloading the in-flight data via telemetry during operation of the spacecraft mission; estimating a system sensitivity function by taking the ratio of an output power spectrum to an input power spectrum; and determining stability margins of the attitude control system from the system sensitivity function by determining a gain margin GM and a phase margin PM from the formulas: ]]>where “amin” is the reciprocal of the peak of the system sensitivity function. The method optionally includes redesigning and providing a new control law to the control system if deemed necessary.
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