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? CHECK LOCATION OF SATELLITES ? PREPARE NEW WORLD MODEL DATA, OVERALL MEASUREMENT ROUTINE FROM EXPECTED CLOUD COVER, WEATHER, SUN POSITION, ETC., FOR EACH SATELLITE IN UPCOMING MEASURMENT ? TRANSMIT DATA AND INSTRUCTIONS ? RECEIVE SATELLITE DATA ? PROCESS UNIDENTIFIED ANOMALIES AND TAKE APPROPRIATE ACTION ? UPDATE WORLD MODEL, HYPOTHESIZE SEASONAL AND TIME DEPENDENT PATTERNS, DETERMINE NEW CORRELATIONS AND TRENDS ? INTERFACE WITH USER AND DATA ARCHIVAL SYSTEMS AND NATURAL LANGUAGE INTERFACE ? COORDINATE AND MAINTAIN ALL SYSTEM COMPONENTS ? DETERMINE SYSTEM STATUS AND PERFORMANCE

SATELLITES ? DETERMINE LOCATION FROM AUTONOMOUS NAVIGATION SYSTEM USING POSITION SENSITIVE ANGULAR MEASUREMENTS TO CELESTIAL OBJECTS, NICHE LOCATIONS AND MEASUREMENTS TO KNOWN BEACONS AND THE GPS ? CALL OUT NICHES BY STRIP ALONG OVER PASS ? APPLY TEMPORAL, SENSORAL, SUN AND OTHER CORRECTIONS ? FROM NICHE TYPES AND BOUNDARIES DETERMINE OPTIMUM SENSOR COMBINATIONS, ADJUSTS MEASUREMENT STRATEGY AND ALGORITHMS ? APPLY OTHER PREPROCESSING ? PROCESS DATA ? CHECK RESULTS ? USE RESULTS TO DETERMINE NEW LOCATION ? APPLY POST PROCESSING PROCEDURES ? DETERMINE TRANSMISSION ROUTING TO GROUND

? PREPARE FOR SPECIFIC SATELLITE ORBIT ? CHANGE ALGORITHM ? CHANGE MEASUREMENT STRATEGY ? CHECK RESULT ? CHANGE MODEL ? CHANGE DATABASE

Figure 2.11.- Functions of IESIS expert systems.

various bands covering a niche having ? characteristics coded in memory. Thus, 8 sk bits are needed for niche sensing, and 20 sensors having 15 characteristics require 2400 bits. It is also conceivable that 10 other characteristics might be detailed yielding an additional 80 bits. Consequently, without using boundary analysis in the image correlations, the total information i required for each niche is approximately 2600 bits, more than an order of magnitude larger than the information needed simply to identify the niche.

Thus, it is most efficient if the onboard world model simply consists of descriptions of those niches the IESIS satellite(s) will encounter along an orbital swath on the next revolution. The model is uploaded from the ground prior to each pass. If swath width in kilometers is W, repeat time (in days) for the satellite to cover the entire