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![]() History of NOAA's Polar Observational Environmental Satellites NOAA FACT SHEET
The first weather satellite in a series of spacecraft originally known as the Television Infrared Observation Satellites (TIROS) was launched on April 1, 1960. By the mid 1970's NOAA and NASA agreed to produce the series operationally based on the TIROS-N generation of satellites. TIROS-N, a research and development spacecraft serving as a prototype for the operational follow-on series, NOAA-A through NOAA-N Prime was on launched October 13, 1978. Beginning with NOAA-E, launched in 1983, the basic satellite was "stretched" to permit accommodation of additional research instruments. This became known as the Advanced TIROS-N configuration. Some of the additional instruments flown include: Search and Rescue; Earth Radiation Budget Experiment, and the Solar Backscatter Ultraviolet spectrometer. Three of those instruments, Search and Rescue Repeater, Search and Rescue Processor and Solar Backscatter Ultraviolet Radiometer, became part of the operational program. The primary sounding instrumentation has remained essentially unchanged until the addition of Advanced Microwave Sounding Units-A and -B on NOAA-K (15). The Microwave Humidity Sounder replaces the AMSU-B on NOAA-N Prime performing essentially the same science. The satellite design life throughout the series has been two years. The lifetime is a cost/risk tradeoff since more years normally result in a more expensive satellite. To mitigate that risk, the NOAA-N Prime satellite uses the most reliable NASA-approved flight parts, Class S, and considerable redundancy in critical subsystem components. The instruments are not redundant, but they have a three-year design life in order to enhance their expected operational reliability. Because of the inherent reliability built in and the extensive ground testing prior to launch, this series of satellites has demonstrated performance well exceeding the design lifetime. TIROS-N was launched October 13, 1978, and was the first satellite in the fourth generation operational environmental satellite system. TIROS-N was a research and development spacecraft serving as a proto-type flight for the operational follow-on series, NOAA-A through N' spacecraft. The spacecraft was deactivated on February 27, 1981.
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