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Precision Positioning
The Airborne Sensing team has developed an interface that sends the mid-point of an exposure signal to the GPS event-marker log. The GPS system notes exactly when the camera shutter was open at its mid-point and, combining this with other GPS data, allows for the precise (less than 300 mu) location of the perspective centre at the instant of exposure. Eccentricity parameters between the antenna phase centre and the optical nodal point are known to within 1 mm x,y,z. The system, installed on a notebook computer with built in math co-processor, logs in-flight GPS data for further post-processing.
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