CryoSat Performance Monitoring - UCL

Retracker Flags Monitoring

Source: L2i (LRM, SAR, SARin) · Variable: flag_retracker_20_ku

The 20 Hz retracker flag word: failures of each L2 retracker, and the waveform quality checks of each mode. Statistics are the percentage of records with each bit set. The retracker failure percentages per mode correspond to the Retracker Failure statistics of the previous portal (LRM: CFI = retracker 1, LIRT = retracker 2, OCOG = retracker 3).

Acquisition mode
Area

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

Retracker Flags: Retracker 1 failure, All modes: Maps

North Polar (>60N) Single map
Map of Retracker Flags: Retracker 1 failure, All modes. North Polar (>60N), Baseline-F, cycle 194
South Polar (<60S) Single map
Map of Retracker Flags: Retracker 1 failure, All modes. South Polar (<60S), Baseline-F, cycle 194

Retracker Flags: % of Records with each Flag bit Set, Cycle 194, Global

Flag bit Product flag All modesLRMSARSARin
Retracker 1 failure retracker_1_fail 13.09 18.58 1.44 2.16
Retracker 2 failure retracker_2_fail 10.28 15.25 0 0
Retracker 3 failure retracker_3_fail 3.06 4.53 0 0
Sea ice retracker failure sea_ice_retracker_fail 1.11 0 1.44 6.17
Poor phase fit poor_phase_fit 0 0 0 0
Poor power fit poor_power_fit 0.00 0 0.00 0
FDM / OCOG failure fdm_ocog_fail 0 0 0 0
Fit failed fit_failed 0 0 0 0
SARin low coherence sarin_low_coherence 0 0 0 0
SARin interpolation failure sarin_interp_fail 0 0 0 0
Abnormal beam behaviour parameter abnormal_bb_param 0 0 0 0
Out of range out_of_range 3.88 5.75 0 0
Bad leading edge bad_leading_edge 5.51 8.17 0 0
Low variance low_variance 0 0 0 0
High noise high_noise 0 0 0 0
High peakiness high_peakiness 7.79 11.55 0 0
Low peakiness low_peakiness 0.94 1.39 0 0
Low power low_power 0 0 0 0

Percentage of the valid records in each acquisition mode with the bit set. Select a bit to show its maps, statistics and trends, and an area above to show this table for it.

Retracker Flags: Retracker 1 failure, All modes: Cycle 194 Statistics

Area Records Valid Not set % Set % Other
Global 32,922,897 32,922,897 (100.0%) 86.91 13.09 0
North Polar (>60N) 5,627,894 5,627,894 (100.0%) 88.09 11.91 0
South Polar (<60S) 5,553,821 5,553,821 (100.0%) 92.58 7.42 0

Statistics use every 20 Hz measurement of the cycle within each area. Flag percentages are of the valid (non-fill) values.

Retracker Flags: Retracker 1 failure, All modes: Trends

Baselines:
Baseline-F statistics (CSV)

Click a point to show that cycle.

Retracker Flags: Retracker 1 failure, All modes: 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