| File | K5_20231008013527_000010_55609_D_ES02_HH_SCS_B_L1A.h5 |
|---|---|
| Acquisition mode | STANDARD |
| Metric | Measured value | Threshold | Result |
|---|---|---|---|
| Surviving ratio | 21,882 / 309,797,760 (0.0071%) | PASS < 0.1% WARN < 0.5% |
PASS |
| Threshold | 0.3550 (midpoint(lmin,d2max)) | Auto-detected | OK |
| Mean Doppler Centroid | 775.56 Hz (squint 0.0900°) | Reference only | OK |
Background image showing the SLC amplitude in dB.
Ambiguity index |L-R|/(L+R+ε): the normalized difference between the two images after splitting into forward/backward sub-apertures. Higher (brighter) values indicate suspected ambiguity regions. Hot colormap; raw distribution before thresholding.
Distribution of ambiguity index values (histogram, log scale). The red dashed line is the automatically detected threshold; pixels at or above this value are treated as ambiguity.
The threshold is set automatically as the midpoint between the first-derivative point (steepest slope, green) and the second-derivative point (maximum curvature, orange) of the distribution curve. If the distribution decreases monotonically, the image is considered free of ambiguity and all candidates are discarded.
(Hover to see the count per bin)
Pixels at or above the threshold (suspected ambiguity) are plotted as dots over the original SLC. Dots forming a regular pattern (ghosts) indicate real ambiguity; scattered dots are more likely noise.
Combined shows all pixels by magnitude |L-R|/(L+R+ε) (red); Left/Right split them by sign into the dominant sub-aperture (yellow/orange). A strong bias toward one side suggests ambiguity folded in from one side of the Doppler spectrum. Numbers in parentheses are pixel counts (after display stride).
