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| Advanced TIROS-N | |
|---|---|
| Name | Advanced TIROS-N |
| Mission type | Earth observation |
| Operator | National Oceanic and Atmospheric Administration (NOAA) / National Aeronautics and Space Administration (NASA) |
| Manufacturer | Martin Marietta / Hughes Aircraft Company |
| Launch mass | ~1,450 kg |
| Power | solar panels and batteries |
| Launch date | 1978–1992 (series deployments) |
| Orbit | Sun-synchronous polar orbit |
| Instruments | Advanced TIROS Operational Vertical Sounder, High Resolution Infrared Radiation Sounder, Visible Infrared Spin-Scan Radiometer, Search and Rescue Satellite-Aided Tracking |
Advanced TIROS-N Advanced TIROS-N is a United States series of polar-orbiting meteorological satellites developed as a joint NOAA–NASA program to advance operational weather monitoring and atmospheric sounding. The program evolved from earlier TIROS and NOAA polar-orbiting efforts to incorporate improved radiometers, sounding instruments, and onboard data handling to serve civil weather forecasting and environmental monitoring. Operating in Sun-synchronous polar orbits, the spacecraft provided global coverage for agencies such as National Weather Service, European Centre for Medium-Range Weather Forecasts, and military users like the United States Air Force.
The Advanced TIROS-N series continued the lineage begun by TIROS-1 and later NOAA-1 through NOAA-6, integrating capabilities pioneered on ESSA and Nimbus platforms. Missions in the series carried instruments for visible, infrared, and microwave sensing to support operational programs at NOAA, NASA Goddard Space Flight Center, and international partners including EUMETSAT and Japan Meteorological Agency. The design emphasized redundancy, improved thermal control, and enhanced ground-segment interfaces with networks such as World Meteorological Organization Global Telecommunication System and the Argos data collection system operated in collaboration with CNES.
Development began through cooperative agreements involving NASA, NOAA, and contractors like Hughes Aircraft Company and Martin Marietta, building on technology from Advanced TIROS prototypes and NIMBUS-7 heritage. Engineering goals targeted higher-resolution radiometry, more accurate vertical sounding using instruments derived from High Resolution Infrared Radiation Sounder (HIRS) experiments, and expanded onboard data storage inspired by Geostationary Operational Environmental Satellite digital systems. Structural design used spin-stabilization and despun platforms influenced by Nimbus and TIROS-N predecessors, while attitude determination referenced techniques from Transit and Landsat missions. Launch vehicles were often variants of the Delta rocket family and coordinated with launch facilities at Vandenberg Air Force Base and Cape Canaveral Air Force Station.
Payloads combined legacy sensors and novel instruments: a High Resolution Infrared Radiation Sounder (HIRS) for atmospheric temperature and moisture sounding, an Advanced TIROS Operational Vertical Sounder (ATOVS) suite integrating HIRS with the Stratospheric Sounding Unit concept, and a Visible Infrared Spin-Scan Radiometer (VISSR)-class imager adapted from GOES heritage for cloud and surface imaging. Microwave sounding elements, building on Nimbus-7 SMMR and ERS research, enhanced retrievals under cloudy conditions. The satellites also carried Search and Rescue Satellite-Aided Tracking (SARSAT) beacons interoperable with International Cospas-Sarsat Programme infrastructure and a data collection system compatible with ARGOS for environmental buoys and wildlife tagging. Onboard processors followed architectures similar to NASA flight computers used on Landsat and Polar-orbiting Operational Environmental Satellite classes, while calibration referenced standards from National Institute of Standards and Technology.
Advanced TIROS-N spacecraft launched in a succession of flights from the late 1970s through the early 1990s, providing continuous polar coverage that fed assimilation systems at National Centers for Environmental Prediction (NCEP), European Centre for Medium-Range Weather Forecasts (ECMWF), and regional forecasting centers such as Met Office and Japan Meteorological Agency. Individual launches were timed to maintain morning and afternoon constellation nodes to support numerical weather prediction models used by NOAA National Weather Service and military forecasting units including Air Weather Service. Failures and anomalies were investigated with support from Jet Propulsion Laboratory and contractor test groups informed by lessons from TIROS-N and NOAA program disruptions. Data dissemination used satellite data relay networks like NOAA Polar Orbiter Data Distribution and contributed to reanalysis efforts such as ERA-Interim and Reanalysis Project initiatives.
Data streams from Advanced TIROS-N fed operational processing chains at NOAA and research centers including NASA Goddard, NCAR, and Scripps Institution of Oceanography. Sounding profiles from HIRS and ATOVS were assimilated into global models at ECMWF and NCEP to improve short- and medium-range forecasts critical for agencies like Federal Aviation Administration and United States Coast Guard. Imagery supported hazards monitoring by FEMA and environmental assessments by Environmental Protection Agency and international programs such as United Nations Environment Programme. SARSAT transponder data expedited maritime distress coordination via International Maritime Organization frameworks. Calibration and validation campaigns involved field programs run by NOAA Research and academic partners including Massachusetts Institute of Technology and University of Colorado Boulder.
The Advanced TIROS-N series influenced subsequent platforms such as NOAA-K and the POES successors by demonstrating integrated sounding–imager payloads, robust data relay for international users, and operationally reliable satellite bus architectures. Technologies matured on the program—advanced radiometers, microwave sounding techniques, and SARSAT integration—shaped capabilities of later systems like Metop and NPOESS successor concepts. The program fostered cooperation among NOAA, NASA, EUMETSAT, and research institutions including NCAR and JPL, setting precedents for data sharing, calibration standards, and multi-agency mission management that persist in modern polar-orbiting meteorological satellite programs.
Category:Weather satellites of the United States Category:Earth observation satellites