Backscatter (Sigma0) Monitoring
Source: L2 GDR-A (all acquisition modes) · Variables: sig0_1_20_ku, sig0_2_20_ku, sig0_3_20_ku
Backscatter coefficient of each 20 Hz measurement for each L2 retracker, corrected for instrument effects and including a system bias. In SAR and SARin modes the retracker 1 backscatter is computed from the amplitude of an OCOG retracker applied to an LRM-like convolved waveform. Retrackers 2 and 3 are only used in LRM mode.
| Retracker | LRM | SAR | SARin |
|---|---|---|---|
| Retracker 1 sig0_1_20_ku | Ocean CFI retracker | UCL sea-ice retracker | UCL margins retracker |
| Retracker 2 sig0_2_20_ku | UCL land-ice retracker | N/A (not used) | N/A (not used) |
| Retracker 3 sig0_3_20_ku | OCOG retracker | N/A (not used) | N/A (not used) |
Baseline-F, cycle 194: 25-Aug-2026 to 23-Sep-2026 · 263 GDR-A files · data covers 18.1 of 30 days Partial cycle processed 11-Oct-2026 01:13 UTC
Backscatter (Sigma0): Retracker 1, All modes: Maps
Backscatter (Sigma0): Retracker 1, All modes: Cycle 194 Statistics
| Area | Records | Valid | Mean (dB) | Median (dB) | Std Dev (dB) | RMS (dB) | Min (dB) | Max (dB) |
|---|---|---|---|---|---|---|---|---|
| Global | 32,941,951 | 32,939,122 (100.0%) | 9.57 | 10.41 | 7.37 | 12.08 | -51.48 | 50.44 |
| North Polar (>60N) | 5,641,763 | 5,640,894 (100.0%) | 13.23 | 12.46 | 10.73 | 17.04 | -51.48 | 50.44 |
| South Polar (<60S) | 5,553,821 | 5,553,376 (100.0%) | 9.95 | 9.38 | 6.48 | 11.87 | -45.45 | 49.40 |
Statistics use every 20 Hz measurement of the cycle within each area. Std Dev is the population standard deviation, RMS the root mean square.
Backscatter (Sigma0): Retracker 1, All modes: Trends
Click a point to show that cycle.
