Streamlining Space Launch Range Safety (2000) / Chapter Skim
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4 Flight Safety Requirements
4 Flight Safety Requirements
Pages 26-35
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From page 26... ...
TRACKING A large fraction of range support costs are related to developing, maintaining, and operating accurate and reliable tracking systems. EWR 127-1 requires "at least two adequate 26 and independent instrumentation data sources" for tracking launch vehicles "from T-0 throughout each phase of powered flight up to the end of range safety responsibility" (Paragraph 2.5.4~.
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From page 27... ...
Data of particular interest to range safety are guidance data, command receiver status, and steering commands. TMIG data must be used as a tracking source for launch vehicles equipped with an inertial guidance system (EWR 127-1, Section 2.5.5.1~.
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From page 28... ...
TMIG data can quickly indicate sudden turns or rotations, and a failure during a staging event can be detected using TMIG data three or four seconds earlier than with radar data. This may be less important with GPS tracking systems, which are expected to reduce lag times.
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From page 29... ...
Both differential GPS receiver and translator systems, if properly designed and qualified, would be able to meet range requirements for tracking accuracy. Analog GPS Translator System Launches of Navy SLBMs conducted offshore from Cape Canaveral use a GPS-based analog translator system for range safety.
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From page 30... ...
Necessary algorithms have already been developed, and experimental testing has demonstrated their versatility and robustness over a broad range of simulated flight conditions. STREAMLINING SPACE LAUNCH RANGE SAFETY Assessing the Alternatives Costs Switching to a GPS-based range safety tracking system would mean replacing each onboard C-band transponder with either a GPS receiver system or a GPS translator sys tem with an S-band telemetry transmitter separate from the one used for TMIG data.
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From page 31... ...
Also, if a vehicle equipped with a translator system departs from the planned flight path, flight termination would have to be commanded from the ground; the GPS translator system would not detect the off-course condition because GPS position data would not be available on board. GPS receivers, which would compute position and velocity data on board, would enable development of FTSs with a higher degree of autonomy.
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From page 32... ...
AFSPC should deploy a GPS receiver tracking system as the baseline range tracking system for space launch vehicles. The transition to GPS-based tracking should be completed as rapidly as feasible.
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From page 33... ...
Like current FTS flight hardware, autonomous FTSs would be designed for high reliability, tested for compatibility with the launch environment, and include means for prelaunch verification of operability. Certain Russian launch vehicles use fully autonomous FTSs, although they do not use GPS (or equivalent)
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From page 35... ...
Briefing by Dan Smith, Lockheed Martin Astronautics, to a panel of the Committee on Space Launch Range Safety, Lockheed Martin Astronautics, Denver, Colorado, June 24, 1999. Wells, L
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