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Products - LEO-LEO Intercalibration

The Simultaneous Nadir Overpass (SNO) Technique to Estimate Inter-Calibration Biases Between Similar Instruments Flying on Different Low-Earth-Orbit (LEO) Satellites
SNO animation of earth and satellites Estimating post-launch measurement biases between similar instruments flying onboard different low-earth-orbiting (LEO) satellites can be difficult. One reason for this difficulty is that often these instruments are not looking at the same Earth scene at the same time. On the other hand, the fact that all LEO satellites revolve around the Earth at slightly different periods causes them to occasionally view the same subsatellite location at nearly the same time. Ideally, identical radiometers flown on different satellites that simultaneously view the same exact Earth target should produce redundant observations. Any deviation from these results would be attributable to relative calibration differences between the “identical” radiometers. Taking advantage of this concept, the Simultaneous Nadir Overpass (SNO) method was developed to estimate and track relative calibration-related measurement biases between radiometers flown on-board different LEO satellites. For a given pair of LEO satellites, the essence of the SNO method is to minimize Earth- scene-related differences found between instrument measurements by utilizing subsatellite observations close to satellite orbital intersections that have a relatively small time difference (~ 30 seconds).

1. Microwave Imagers
LEO-LEO Intercalibration - Microwave Imager ... more detail
2. Microwave Sounders
LEO-LEO Intercalibration - Microwave Sounders ... more detail
3.Visible/Infrared Imagers
LEO-LEO Intercalibration - Visible/Infrared Imager ... more detail
4. Infrared Sounders
LEO-LEO Intercalibration - Infrared Sounders ... more detail
5. Ultraviolet Instruments
LEO-LEO Intercalibration - Ultraviolet Instruments ... more detail
Topic revision: r6 - 29 Oct 2010, HaifengQian
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