CDS vs. DDM: comparison of basic parameters.
|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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