CryoSat Performance Monitoring - UCL

Stack Beam Behaviour Monitoring

Source: L2i (LRM, SAR, SARin) · Variables: stack_std_20_ku, stack_centre_20_ku, stack_scaled_amplitude_20_ku, stack_skewness_20_ku, stack_kurtosis_20_ku, stack_peakiness_20_ku, stack_std_angle_20_ku, stack_centre_angle_20_ku, stack_centre_look_angle_20_ku, stack_gaussian_fitting_residuals_20_ku, stack_number_before_weighting_20_ku, stack_number_after_weighting_20_ku

Parameters of the Gaussian fitted to the range integrated power of the single look echoes of each SAR / SARin stack (the beam behaviour parameters), and the number of beams in the stack. SAR and SARin stacks differ (ie ~245 beams in SAR mode, ~58 in SARin), so modes are shown separately. Unused (0) in LRM mode. Angles are converted from radians to millidegrees.

Acquisition mode
Area
All areas Global North Polar (>60N) South Polar (<60S)

Only SAR and SARin mode measurements are used.

Baseline-F, cycle 194: 25-Aug-2026 to 23-Sep-2026 · 7,022 L2I files · data covers 17.9 of 30 days Partial cycle processed 12-Oct-2026 01:11 UTC

Stack Beam Behaviour: Standard deviation, SAR mode: Maps

Global Single map
Map of Stack Beam Behaviour: Standard deviation, SAR mode. Global, Baseline-F, cycle 194
North Polar (>60N) Single map
Map of Stack Beam Behaviour: Standard deviation, SAR mode. North Polar (>60N), Baseline-F, cycle 194
South Polar (<60S) Single map
Map of Stack Beam Behaviour: Standard deviation, SAR mode. South Polar (<60S), Baseline-F, cycle 194

Stack Beam Behaviour: Standard deviation, SAR mode: Cycle 194 Statistics

Area Records Valid Mean (beams) Median (beams) Std Dev (beams) RMS (beams) Min (beams) Max (beams)
Global 6,229,781 6,229,781 (100.0%) 27.53 25.85 22.02 35.25 0.50 79.84
North Polar (>60N) 2,699,113 2,699,113 (100.0%) 20.11 7.85 21.04 29.11 0.50 74.43
South Polar (<60S) 1,527,430 1,527,430 (100.0%) 25.65 23.58 19.91 32.47 0.50 62.36

Statistics use every 20 Hz measurement of the cycle within each area acquired in SAR mode. Std Dev is the population standard deviation, RMS the root mean square.

Stack Beam Behaviour: Standard deviation, SAR mode: Trends

Baselines:
Baseline-F statistics (CSV)

Click a point to show that cycle.

Stack Beam Behaviour: Standard deviation, SAR mode: All Cycles from Baseline-F

Cycle Timespan Coverage (days) GlobalNorth Polar (>60N)South Polar (<60S)
194 25-Aug-2026 to 23-Sep-2026 17.9 partial Global map, cycle 194 North Polar (>60N) map, cycle 194 South Polar (<60S) map, cycle 194
193 26-Jul-2026 to 24-Aug-2026 29.8 Global map, cycle 193 North Polar (>60N) map, cycle 193 South Polar (<60S) map, cycle 193
192 26-Jun-2026 to 25-Jul-2026 21.8 partial Global map, cycle 192 North Polar (>60N) map, cycle 192 South Polar (<60S) map, cycle 192