Table 1
CDS vs. DDM: comparison of basic parameters.
| CDS | DDM | |
|---|---|---|
| Time resolution | ∼10 s | Typically 15 or 5 min |
| Spatial information | Reflection points are assumed in midpoints between Tx and Rx | Location of reflection points is displayed in SKYmaps |
| Virtual height resolution | None. Reflection heights are estimated from ionograms | Typically 5 km |
| Measurement duration | Continuous | ∼1 min |
| Sounding frequency | Fixed | Fixed or related to critical frequencies, programmable |
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