Computer Science – Performance
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.937m&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Computer Science
Performance
Scientific paper
H-2A launch vehicle, developed by National Space Development Agency of Japan (NASDA), has made successful two consecutive test flights and is now ready for operational phase. This paper presents the overview of the test flight results and the plan for the future. Two test flights of H-2A were launched from Tanegashima Space Center (TNSC) of NASDA and successfully made following missions: (a) Test flight no.1 (Date: 16:00 JST, August 29, 2001) Configuration: H2A202 (standard type, basic configuration), single launch Mission: To verify vehicle performance. Separated Laser Range Equipment (LRE) for accurate trajectory determination Results: Achieved as planned (b) Test flight no.2 (Date: 11:45 JST, February 4, 2002) Configuration: H2A2024 (standard type with four additional solid boosters, SSB), dual launch Mission: To put Mission Demonstration Satellite-1 (MDS-1) and piggy-back reentry probe (Demonstrator of Atmospheric Reentry System with Hyper Velocity, DASH) into proper orbit. Results: Achieved planned mission for MDS-1. Failed to separate DASH due to wiring mistakes of the probe. In the two test flight, following results are obtained and the vehicle is confirmed to be performed as nominal. (1) Accuracy of satellite separation trajectory was confirmed. (Estimated error at apogee = F1: 4.4km, F2: 39km) (2) The acoustic and vibration environment was confirmed to be within the planned level. (3) Verified the vehicle performance As for vehicle performance, items listed below are verified: (1) Engine (LE-7A and LE-5B) and propulsion system performance are confirmed to be within estimated range, including the ability of third restart capability of LE-5B after coasting time over 4400 sec. (2) Guidance, Navigation and Control systems are confirmed to perform as planned, including the successful spin-up maneuver test and flight evaluation of the onboard GPS receiver. (3) Separation mechanism is confirmed to have performed as planned. (4) Five Onboard video cameras are installed to confirm the separation performance and propellant settling in second stage liquid hydrogen tank. As the vehicle itself showed its expected performance flawlessly in two consecutive flights, H-2A is now considered to be flight-proven and ready for operational phase. Five flights with Japanese government payloads are planned by summer 2003, and H-2A is now paving its way to the commercial launch services.
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