Analysis of Entry Accelerometer Data A case study of Mars Pathfinder
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Analysis of Entry Accelerometer Data A case study of Mars Pathfinder
Analysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary La Analysis of Entry Accelerometer Data A case study of Mars Pathfinderaboratory, University of Arizona, Tucson, AZ 85721, USA.2- Planetary and Space Science Research Institute, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK.Address to which the proofs should be sent: Paul Withers, Lunar and Planetary Laboratory, University of Arizona. Tucson. AZ 85721. USA.O Analysis of Entry Accelerometer Data A case study of Mars Pathfinderffprint requests should be sent to: Paul WithersCorresponding author:Paul WithersEmail: withers(ậ)lpl.arizona.eduFax: +1 520 621 49331https://khothuviAnalysis of Entry Accelerometer Data A case study of Mars Pathfinder
en.cori!AbstractAccelerometers are regularly flown on atmosphere-entering spacecraft. Using their measurements, the spacecraft trajectory and the vertAnalysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary La Analysis of Entry Accelerometer Data A case study of Mars Pathfinderor trajectory and atmospheric structure reconstruction and outline them here in detail. We discuss which physical properties are important in atmospheric entry, instead of working exclusively with the dimensionless numbers of fluid dynamics. Integration of the equations of motion governing the space Analysis of Entry Accelerometer Data A case study of Mars Pathfindercraft trajectory is carried out in a novel and general formulation. This does not require an axisymmetric gravitational field or many of the other assAnalysis of Entry Accelerometer Data A case study of Mars Pathfinder
umptions that are present in the literature. We discuss four techniques - head-on, drag-only, acceleration ratios, and gyroscopes - for constraining sAnalysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary La Analysis of Entry Accelerometer Data A case study of Mars Pathfinderr the aerodynamic acceleration, whereas the drag-only technique uses the correct magnitude and an approximate direction. The acceleration ratios technique uses the correct magnitude and an indirect way of finding the correct direction and the gyroscopes technique uses the correct magnitude and a dir Analysis of Entry Accelerometer Data A case study of Mars Pathfinderect way of finding the correct direction. The head-on and drag-only techniques are easy to implement and require little additional information. The acAnalysis of Entry Accelerometer Data A case study of Mars Pathfinder
celeration ratios technique requires extensive and expensive aerodynamic modeling. The gyroscopes technique requires additional onboard instrumentatioAnalysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary La Analysis of Entry Accelerometer Data A case study of Mars Pathfinderinder dataset. We find inconsistencies2within the published work of the Pathfinder science team, and in the PĐS archive itself, relating to the entry state of the spacecraft. Our atmospheric structure reconstruction, which uses only a simple aerodynamic database, is consistent with the PDS archive I Analysis of Entry Accelerometer Data A case study of Mars Pathfindero about 4%. Surprisingly accurate profiles of atmospheric temperatures can be derived with no information about the spacecraft aerodynamics. Using noAnalysis of Entry Accelerometer Data A case study of Mars Pathfinder
aerodynamic information whatsoever about Pathfinder, our profile of atmospheric temperature is still consistent with the PDS archive to about 8%. As aAnalysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary La Analysis of Entry Accelerometer Data A case study of Mars Pathfindereywords: Accelerometer. Atmosphere. Atmospheric Entry; Data Reduction Techniques,Mars, Mars PathfinderMiuiíiữnsA area(J the linear acceleration vector of the centre of mass of the rigid bodyaero subscript indicating effects due to aerodynamicsBan arbitrary vectorca dimensionless force coefficientCj0 Analysis of Entry Accelerometer Data A case study of Mars Pathfinder the lesseral normalised spherical harmonic coel ficienl of degree 2 and order 0can subscript for a Cartesian co-ordinate systemFM Euler matrix in GolAnalysis of Entry Accelerometer Data A case study of Mars Pathfinder
dstein's xyz-convention3https://khothuvien.cori!Fafrợ aerodynamic force acting on the spacecraft9 the acceleration vector due to gravityGM the productAnalysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary La Analysis of Entry Accelerometer Data A case study of Mars PathfindererAnalysis of Entry Accelerometer Data: /X case study of Mars PathfinderPaul Withers1, M. c. Towner, B. Hath!2, J. c. Zarnecki21- Lunar and Planetary LaGọi ngay
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