GOES-I/M IMAGE NAVIGATION AND REGISTRATION
An Image Navigation and Registration (INR) system has been designed which enables the GOES system to provide and maintain the geographical location of Imager and Sounder data with a high degree of accuracy in near real-time. The INR system removes the apparent image-to-image motion resulting from orbital motion, satellite attitude deviations, and satellite thermal distortions. This is achieved by continuously steering the instrument scan mirrors to compensate for this motion. Compensation signals are generated in the attitude and orbit control system based on predicted orbit and attitude parameters that are transmitted to the satellite at least once each day from the CDA ground station. These parameters are generated using image landmarks, star views, and satellite range data collected throughout the day.
IMAGER INR REQUIREMENTS
REQUIREMENT, DURING: NOON +-8 HR MIDNIGHT +-4 HR
Navigation accuracy (where is a pixel) 4.0 km 6.0 km
Registration within an image 1.5 km 1.5 km
Registration between repeated images, after
15 minutes 1.5 km 2.5 km
90 minutes 3.0 km 3.8 km
24 hours 6.0 km 6.0 km
48 hours 7.5 km 7.5 km
Channel-to-channel registration 1.0 km 1.0 km
Note: distance requirements are for the sub-satellite (nadir) view.
SOUNDER INR REQUIREMENTS
REQUIREMENT, DURING: NOON +-8 HR MIDNIGHT +-4 HR
Navigation accuracy (where is a pixel) 10 km 10 km
Registration within a 120 minute sounding 3 km 4 km
Registration between repeated soundings, after
24 hours 10 km 10 km
Channel-to-channel registration 1 km 1 km
Note: distance requirements are for the sub-satellite (nadir) view.