Evaluation of a spacecraft attitude and rate estimation algorithm

Purpose: This paper aims to present the development and performance evaluation of an attitude and rate estimation algorithm using an extended Kalman filter structure based on a body‐referenced representation of the state. Design/methodology/approach: The algorithm requires only geomagnetic field data and can be used as a low‐cost alternative or as a back‐up estimator in the case of attitude sensor failures. The satellite rate is estimated as a part of the filter state and thus no gyroscope is necessary. The assessment of the algorithm performance is realized through a Monte Carlo simulation using a low‐Earth orbit, nadir‐pointing satellite. Findings: Given some attitude and rate error requirements, the range of admissible initial errors on the filter state and the effect of un‐modelled disturbance torque are determined, along with the achievable attitude and rate accuracies. Practical implications: Because the simulation set‐up is clearly stated, the results of this evaluation can be used as a benchmark for other estimation algorithms. Originality/value: The necessary assumptions and approximations used to derive the filter equations are explicitly pointed out for the benefit of the readers. Well‐defined filter initial conditions are used in an extensive series of tests resulting into a unique set of findings

Commissioning the UPM satellite simulator facility platform

The purpose of this paper is to test and validate the UPM Satellite Simulator Facility (SSF) platform. The work relates to satellite testing and qualification experiments. The satellite Attitude Determination and Control System (ADCS) consist of flight-proven equipment from Canada, Germany and America. The flight hardware check has to be performed for the SSF qualification. Therefore, dedicated test procedures in order to test and verify the satellite control mode (i.e., Idle mode, Detumble mode, Coarse Pointing mode and Fine Pointing mode) has to be implemented. The results of these experiments are discussed to qualify the health of the satellite itself and the ADCS equipment. The UPM SSF responded very well to all the conducted tests and therefore, its performances are validated