Inverse Problem Solution for Determining Spacecraft Orientation from Pressure Measurements

Details Inverse Problem Solution for Determining Spacecraft Orientation from Pressure Measurements Inverse Problem Solution for Determining Spacecraft Orientation from Pressure Measurements

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.563..381h&link_type=abstract

Proceedings of the Fifth European Symposium on Aerothermodynamics for Space Vehicles (ESA SP-563). 8-11 November 2004, Cologne,

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Scientific paper

The goal of this paper is to develop a method of predicting the orientation of a blunt-nosed spacecraft(e.g. Kheops Expert) with regard to pitch and sideslip by measuring pressure data at specified locations in the nose region. The strategy devised here is to use analytic sensor functions (ASF) for the prediction of angle of attack (AoA) and yaw angle according to the local pressure data on the vehicle surface. First, the derivation of the sensor functions is presented. In the second step, the range of validity of these formulas is determined with respect to flight velocity (Mach Number), AoA, and yaw angle by employing extensive computer simulation. Third, the corrections of these empirical formulas is devised for the given vehicle so that the required accuracy (resolution better than 0.5 degrees) is guaranteed within the range of the flight envelope. Fourth, the impact of configuration changes on the accuracy of these functions is also evaluated. Results show that this methodology is effective and accurate in the hypersonic regime, provided specific corrections devised from numerical simulation are applied to modify the analytic sensor functions.

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