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Identification algorithms for micro-propulsion system parameters using drag-free test masses

机译:使用无阻力测试质量的微推进系统参数识别算法

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摘要

Propulsion system characteristics determine to a large extent the dynamic behavior of a spacecraft. For many future science missions technologically novel micro-propulsion systems are required. In order to support its characterization, in-orbit experiments and subsequent data processing on ground can be an appropriate add-on to ground-based laboratory measurements. In this paper two identification methods for three major thruster parameters, thrust gain, thrust direction, and lever arm, are presented and compared. They are based on measurements of a precise inertial instrument that consists of two test masses, whose degrees of freedom are "mixed" with respect to its control principle, i.e. they are either drag-free controlled (free-flying) or suspension controlled (accelerometer mode). Using drag-free coordinates is a novel approach. It is related and compared to the more conventional approach using "accelerometer-like" measurements.
机译:推进系统的特性在很大程度上决定了航天器的动态性能。对于许多未来的科学任务,需要技术上新颖的微推进系统。为了支持其特征,在轨实验和地面上的后续数据处理可以适当地添加到基于地面的实验室测量中。本文提出并比较了三种主要推力器参数的识别方法,推力增益,推力方向和杠杆臂。它们基于由两个测试质量组成的精密惯性仪器的测量,这些质量的自由度相对于其控制原理是“混合”的,即它们是无阻力控制的(自由飞行)或悬架控制的(加速度计)模式)。使用无阻力坐标是一种新颖的方法。它与使用“类似加速度计”的测量的更常规方法相关并且相比较。

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