Autofocus and Phase Correction
Both satellite and airborne SAR data is subject to a number of perturbations which stem from various causes and lead to unknown phase chages in the raw data and subsequent imagery which may be defocussed or non-linear. As part of their SAR processing capability, InfoSAR offer a combined autofocus with phase correction capability that allows unknown sensor motions to be derived from the received SAR signal. The derived motions can then be applied in a motion compensation process to correct the sensor track to a straight line.
This report illustrates the use of these techniques; as it shows, they enable sharply-focused images to be obtained with objects accurately located in the along-track direction. This is an essential component where accurate SAR imagery is required, such as in change detection.
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