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Detailed strategy for acquisition plans for satellite mapping in ascending and descending cycles, emphasizing spatial coverage and coherence, using specific beams and contingencies. Plans include specific timelines, data acquisition, and replanning rules to ensure mission objectives. Focus on minimizing complexity, user impact, and maximizing use of high-priority areas.
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ASF Review Acquisition Plan
Acquisition Requirements • 3 complete cycles ascending and descending • Maximize spatial coverage and coherence • Mapping to occur during same period as AIC-1 • Use beams S6, S2, S1, EL1 and F1 • S3, 4, 5, and 7 as contingency
Acquisition Strategy • Sept to Oct 2000, north-looking mode. • Complete ascending and descending coverage. • Maximize fine beam coverage of high priority areas. • Maximize use of S6, followed by S2, S1 and El-1 to increase probability of coherent IFSAR data.
Acquisition Strategy(cont) • OBR data down-linked to N. Hemisphere GRS’s • McMurdo GRS used for real-time data • Minimize complexity • Minimize impact on other users while meeting mission objectives
MAMM-2 Acquisition Plans • Three plans, all identical. First data take: • orbit 73-105, 19:35:57 UTC 3 Sept • orbit 74-105, 19:35:57 UTC 27 Sept • orbit 75-105, 19:35:057 UTC 21 Oct • Any replanning done in first cycle will become “nominal” plan for remaining two
SAR & Station Usage • Total SAR on-time: 1557.6 min • RTM: 936.0 min • OBR: 619.6 • Total Number of Data Acquisitions: 819* • RTM: 531 • OBR: 288 • Fairbanks: 267 • Gatineau: 2 • Prince Albert: 18
Coverage Errata • Standard-5 used on 3 occasions in ascending plan • 172.78056 • 174.77696 • 315.77602 • Complete coverage not attained in descending plan • 4 small holes near Amery Ice Sheet
Replanning Rules • Limited to first cycle (73) • One complete map is highest priority for cycle-73 (may be assembled from asc and desc coverage) • If only partial coverage possible, target high priority areas • Cycle-73, 74 IFSAR coverage over high priority targets more important than complete IFSAR coverage
Replanning Rules(cont) • Acquisition of gaps in AIC-1 IFSAR higher priority than areas already covered n AIC-1 • Acquisition of gaps in ERS Tandem coverage are higher priority than areas covered during Tandem mission