Squint Synthetic Aperture Radar where the center of the radar beam forms an angle with the axis perpendicular to the flight path. However, what are the advantage and the advantages of it compared to stripmap SAR and why they use it ?
Several comments:
1. Stripmaps can in fact be formed while squinting. This makes mosaicking image patches a little tougher, but not impossible. This allows, for example, looking "ahead" of the aircraft position.
2. Spotlight images can be taken at squint angles other than broadside to allow timely images without requiring a course change by the aircraft. This facilitates a tactical use of SAR.
3. During a pass by a target scene, multiple spotlight images may be formed while dwelling on a scene to allow either a time sequence of images for exploitation, or a noncoherent multilook for speckle reduction.
4. Cross-track stereo SAR images can be formed from the same aperture center, but two different flight paths with different squint angles to force height-dependent layover differences that can be measured to extract topographic (elevation) information.
There are a number of other reasons/applications that are typically variations of the above...
A SAR is squinted to keep acquiring data about an area for longer time than in standard side-looking stripmode. This makes raw data processing more complex but ensures for that area a finer spatial resolution. In this case the squint changes during flight and you have a spotlight mode.
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