Synthetic Aperture Radar (SAR) Data Calibration and Validation
397
by one system to another, thus maintaining continuity. External targets are particularly important in
verifying the antenna gain pattern. This pattern is based on ground- based measurements made prior
to launch, and its accuracy depends on the stiffness of the antenna support structure and deployment
mechanism. For a steered beam phased array antenna, the pattern will generally vary from one beam
to another, and this requires each individual beam to be calibrated.
18.3.2 external CaliBration
The effectiveness of external calibration depends entirely on the accuracy with which the deployed
target cross- section is known. Not only must the cross- section be measured or deriv ...
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