A Japanese first Orbital Reentry 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. The OREX could get experimental data during its orbital flight and reentry. Pressure data along the flight trajectory is among the most important and fundamental of the aerodynamic data. NAL took charge of the pressure measurement, as one of various measurement missions, from vaccum at high altitude down to an altitude of about 75km with a four-decade precision capative type pressure transducer. 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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