SAR Imaging of Moving Targets - Time-Frequency Transforms for Radar Imaging and Signal Analysis - page 170

As discussed in Chapter 5, the time-frequency-based image formation
does not apply any phase compensation. Instead, it takes just time sampling
to display the instantaneous Doppler shift for each scatterer center on the
target. Figure 7.10 shows three temporal image frames of a SAR image
produced by the time-frequency-based image formation. Without using con-
ventional focusing methods, each temporal image frame is automatically
focused for both the moving and the stationary scene. Just like the time-
frequency-based ISAR image formation, the information contained in the
multiple time-varying image frames can be used to detect moving targets
and to focus images of moving targets.

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