NOAA 1 [NASA]
The ITOS (Improved TIROS Operational Satellite) series (TIROS-M was the prototype spacecraft) were the second generation of operational sun-synchronous meteorological spacecraft. Operational satellites were renamed NOAA.
The primary objective of ITOS was to provide improved operational infrared and visual observations of earth cloud cover for use in weather analysis and forecasting. Secondary objectives included providing both solar proton and global heat balance data on a regular daily basis. To accomplish these tasks, the spacecraft carried:
The nearly cubical spacecraft measured 1 by 1 by 1.2 m. The TV cameras and infrared sensors were mounted on the satellite baseplate with their optical axes directed verticially earthward. The satellite was equipped with three curved solar panels that were folded during launch and deployed after orbit was achieved. Each panel measured over 4.2 m in length when unfolded and was covered with 3420 solar cells, each measuring 2 by 2 cm. The ITOS dynamics and attitude control system maintained desired spacecraft orientation through gyroscopic principles incorporated into the satellite design. Earth orientation of the satellite body was maintained by taking advantage of the precession induced from a momentum flywheel so that the satellite body precession rate of one revolution per orbit provided the desired 'earth looking' attitude. Minor adjustments in attitude and orientation were made by means of magnetic coils and by varying the speed of the momentum flywheel.
|Type / Application:||Meteorology|
|Equipment:||2 APT, 2 AVCS, FPR, SPM, 2 Scanning Radiometer|
|Power:||3 deployable fixed solar arrays, batteries|
|TIROS M (ITOS 1)||1970-008A||23.01.1970||Va SLC-2W||Delta-N6||with Australis|
|NOAA 1 (ITOS A)||1970-106A||11.12.1970||Va SLC-2W||Delta-N6||with CEP 1|
|ITOS B||1971-091#||21.10.1971||Va SLC-2E||P||Delta-N6||Only fragments reached orbit|
|ITOS C||-||not launched||Va||→ ITOS E2|