A Comparison of Satellite Drag Measurement Techniques

摘要: The effect of atmospheric drag on a satellite makes it possible to measure density. Two approaches have been proposed: (1) Accelerometers may be mounted in the vehicle acceleration which, together with mass, determines force; (2) Alternatively, drag-free control system used. In this approach, an unsupported, shielded proof mass is used as reference. forced follow by thrustors which are actuated whenever mass. and therefore free drag, follows same orbit. Therefore, thrust must equal force average. By measuring control, can determined. Each approach has advantages disadvantages. relative measurement accuracy bandwidth, calibration techniques, operating convenience orbit longevity function payload discussed.