The first Japanese Orbital Re-entry Experiment (OREX) that successfully flew was launched by the first flight of an H-II rocket on February 4, 1994, and was inserted into a circular orbit at about 450km. NAL took charge of the pressure measurement, as one of various measurement missions, from vacuum at high altitude down to an altitude of about 75km with a four-decade precision capacitive-type pressure transducer. These data can be used to predict the surface pressure and the ambient pressure in similar flights in the future. The data verified the real gas Computational Fluid Dynamics (CFD) codes through comparison with aerodynamic calculation results. This paper outlines the design, fabrication, performance tests, environmental tests, flight operation, flight data and their evaluation of high altitude pressure measurement systems.


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