Using mathematical analysis, an expression can be found for the amplitude and
phase of the compression of an arbitrarily-placed point target. The
phase of a point target, after processing by the modified RD algorithm, was
found to have the following properties:
The phase is preserved at the target peak.
The phase is a linear ramp across the impulse response, with a
negligible quadratic component, but the slope of the ramp varies
between targets. This slope change is due to the spectral location
of the acquired data, rather than the processing.
After the stitching, some targets may have phase and phase slope
discontinuities at the stitching boundaries. This happens when
stitched portions are taken from different burst cycles.
Figure 3:
Three groups of targets stitched together
