Interactive Satellite Navigation for the Naval Environmental Operational Nowcasting System
NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
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The capability of the Tactical Environmental Support System TESS3 to acquire real-time satellite data led to a requirement to earth-locate the satellite data with a high degree of accuracy. After ingesting satellite data, the TESS3 earth locates the data using an orbital prediction model, orbital elements, and an accurate time source. Because of limitations in the model, age of the elements, and time errors as large as 0.5 second, an interactive method was developed to correct navigated images with detectable errors. After reviewing existing methods, an interactive method was designed and developed for the user interface and computer hardware of TESS3. The method incorporates a geographic data base, satellite imagery, an operator, and a mouse or trackball. The one rule for this method is that some visible land features occur in the Image. By using a trackball, the operator can position the geographic overlay onto features discernible on the image. The change in the geographic overlay is then used to correct the satellite navigation data so the current and subsequent retrievals can be extracted with the updated Information. The procedure developed satisfies the Navys requirement for accurate satellite navigation, and it is being implemented into the operational system. Newer procedures are planned that will eliminate most of the need for an operator by contrast processing the satellite image and then matching the image with a geographic data base.
- Air Navigation and Guidance