**Figure 1.**
The spatial distribution of self-crossovers of Sentinel-3A (blue) and dual-crossovers between Sentinel-3A and Jason-3 (red).

**Figure 1.**
The spatial distribution of self-crossovers of Sentinel-3A (blue) and dual-crossovers between Sentinel-3A and Jason-3 (red).

**Figure 2.**
Cycle by cycle percentages of rejected measurement by Sentinel-3A SRAL by the thresholds of (**a**) number of 20 Hz range measurements, number of 20 Hz Sigma0 measurements and radiometer wet tropospheric correction, and (**b**) RMS of 20 Hz range measurements, RMS of 20 Hz Sigma0 measurements, dual frequency ionospheric correction, Sigma0 and SWH during cycle 3–41.

**Figure 2.**
Cycle by cycle percentages of rejected measurement by Sentinel-3A SRAL by the thresholds of (**a**) number of 20 Hz range measurements, number of 20 Hz Sigma0 measurements and radiometer wet tropospheric correction, and (**b**) RMS of 20 Hz range measurements, RMS of 20 Hz Sigma0 measurements, dual frequency ionospheric correction, Sigma0 and SWH during cycle 3–41.

**Figure 3.**
Cycle by cycle mean of (**a**) number and (**b**) RMS of 20 Hz range measurements according to Jason-3 repeat cycles.

**Figure 3.**
Cycle by cycle mean of (**a**) number and (**b**) RMS of 20 Hz range measurements according to Jason-3 repeat cycles.

**Figure 4.**
Cycle by cycle (**a**) means and (**b**) standard deviations of wet tropospheric corrections according to Sentinel-3A repeat cycles.

**Figure 4.**
Cycle by cycle (**a**) means and (**b**) standard deviations of wet tropospheric corrections according to Sentinel-3A repeat cycles.

**Figure 5.**
Cycle by cycle biases and RMSEs of differences of wet tropospheric correction between SAR and PLRM mode.

**Figure 5.**
Cycle by cycle biases and RMSEs of differences of wet tropospheric correction between SAR and PLRM mode.

**Figure 6.**
Cycle by cycle (**a**) means and (**b**) standard deviations of ionospheric corrections according to Sentinel-3A repeat cycles.

**Figure 6.**
Cycle by cycle (**a**) means and (**b**) standard deviations of ionospheric corrections according to Sentinel-3A repeat cycles.

**Figure 7.**
Cycle by cycle biases and RMSEs of differences of dual frequency ionospheric correction between SAR and PLRM mode.

**Figure 7.**
Cycle by cycle biases and RMSEs of differences of dual frequency ionospheric correction between SAR and PLRM mode.

**Figure 8.**
Cycle by cycle (**a**) means and (**b**) standard deviations of SSB corrections according to Sentinel-3A repeat cycles.

**Figure 8.**
Cycle by cycle (**a**) means and (**b**) standard deviations of SSB corrections according to Sentinel-3A repeat cycles.

**Figure 9.**
Cycle by cycle biases and RMSEs of differences of SSB correction between SAR and PLRM mode.

**Figure 9.**
Cycle by cycle biases and RMSEs of differences of SSB correction between SAR and PLRM mode.

**Figure 10.**
Cycle by cycle (**a**) means and (**b**) standard deviations of SWHs according to Sentinel-3A repeat cycles.

**Figure 10.**
Cycle by cycle (**a**) means and (**b**) standard deviations of SWHs according to Sentinel-3A repeat cycles.

**Figure 11.**
Cycle by cycle biases and RMSEs of SWH differences between SAR and PLRM mode.

**Figure 11.**
Cycle by cycle biases and RMSEs of SWH differences between SAR and PLRM mode.

**Figure 12.**
Cycle by cycle (**a**) means and (**b**) standard deviations of backscattering coefficients according to Sentinel-3A repeat cycles.

**Figure 12.**
Cycle by cycle (**a**) means and (**b**) standard deviations of backscattering coefficients according to Sentinel-3A repeat cycles.

**Figure 13.**
Cycle by cycle biases and RMSEs of differences of backscattering coefficients between SAR and PLRM mode.

**Figure 13.**
Cycle by cycle biases and RMSEs of differences of backscattering coefficients between SAR and PLRM mode.

**Figure 14.**
Cycle by cycle (**a**) means and (**b**) standard deviations of wind speeds according to Sentinel-3A repeat cycles.

**Figure 14.**
Cycle by cycle (**a**) means and (**b**) standard deviations of wind speeds according to Sentinel-3A repeat cycles.

**Figure 15.**
Cycle by cycle biases and RMSEs of wind speed differences between SAR and PLRM mode.

**Figure 15.**
Cycle by cycle biases and RMSEs of wind speed differences between SAR and PLRM mode.

**Figure 16.**
Cycle by cycle (**a**) means and (**b**) standard deviations of SLA according to Sentinel-3A repeat cycles.

**Figure 16.**
Cycle by cycle (**a**) means and (**b**) standard deviations of SLA according to Sentinel-3A repeat cycles.

**Figure 17.**
Cycle by cycle biases and standard deviations of SLA differences between SAR and PLRM mode.

**Figure 17.**
Cycle by cycle biases and standard deviations of SLA differences between SAR and PLRM mode.

**Figure 18.**
Cycle by cycle biases and RMSEs of differences of (**a**) radiometer wet tropospheric correction, (**b**) dual frequency ionospheric correction, (**c**) SSB correction, (**d**) SWH, (**e**) Sigma0 and (**f**) wind speed at the self-crossovers of Sentinel-3A

**Figure 18.**
Cycle by cycle biases and RMSEs of differences of (**a**) radiometer wet tropospheric correction, (**b**) dual frequency ionospheric correction, (**c**) SSB correction, (**d**) SWH, (**e**) Sigma0 and (**f**) wind speed at the self-crossovers of Sentinel-3A

**Figure 19.**
Cycle by cycle biases and RMSEs of SAR mode SLA differences at the self-crossovers of Sentinel-3A.

**Figure 19.**
Cycle by cycle biases and RMSEs of SAR mode SLA differences at the self-crossovers of Sentinel-3A.

**Figure 20.**
Map of Sentinel-3A SRAL SAR mode SLA differences at the self-crossovers.

**Figure 20.**
Map of Sentinel-3A SRAL SAR mode SLA differences at the self-crossovers.

**Figure 21.**
Cycle by cycle biases and RMSEs of (**a**) radiometer wet tropospheric correction, (**b**) dual frequency ionospheric correction, (**c**) SSB correction, (**d**) SWH, (**e**) backscattering coefficient, and (**f**) wind speed differences at dual-crossovers between Sentinel-3A and Jason-3 with measurement time difference of 30 min.

**Figure 21.**
Cycle by cycle biases and RMSEs of (**a**) radiometer wet tropospheric correction, (**b**) dual frequency ionospheric correction, (**c**) SSB correction, (**d**) SWH, (**e**) backscattering coefficient, and (**f**) wind speed differences at dual-crossovers between Sentinel-3A and Jason-3 with measurement time difference of 30 min.

**Figure 22.**
Cycle by cycle biases and RMSEs of SLA differences at dual-crossovers between Sentinel-3A and Jason-3 with measurement time difference of 30 min.

**Figure 22.**
Cycle by cycle biases and RMSEs of SLA differences at dual-crossovers between Sentinel-3A and Jason-3 with measurement time difference of 30 min.

**Figure 23.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of radiometer wet tropospheric corrections between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 23.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of radiometer wet tropospheric corrections between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 24.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of dual frequency ionospheric corrections between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 24.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of dual frequency ionospheric corrections between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 25.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of SSB corrections between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 25.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of SSB corrections between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 26.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of SWHs between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 26.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of SWHs between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 27.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of backscattering coefficients between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 27.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of backscattering coefficients between Sentinel-3A and Jason-3 according to Jason-3 repeat cycles.

**Figure 28.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of wind speeds between Sentinel-3A and Jason-3 with Jason-3 repeat cycles.

**Figure 28.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of wind speeds between Sentinel-3A and Jason-3 with Jason-3 repeat cycles.

**Figure 29.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of SLAs between Sentinel-3A and Jason-3 with Jason-3 repeat cycles.

**Figure 29.**
Comparison of cycle by cycle (**a**) means and (**b**) standard deviations of SLAs between Sentinel-3A and Jason-3 with Jason-3 repeat cycles.

**Table 1.**
Technical characteristics of the Sentinel-3A SRAL instrument.

**Table 1.**
Technical characteristics of the Sentinel-3A SRAL instrument.

Parameter | Ku Band | C Band |
---|

Frequency | 13.575 GHz | 5.41 GHz |

Bandwidth | 350 MHz | 320 MHz |

Tracking modes | Closed loop and open loop |

LRM pulse repetition frequency | 1920 Hz |

SAR mode pulse repetition frequency | 18 kHz |

SAR along track solution | ~300 m |

**Table 2.**
Thresholds used for the main altimeter and radiometer parameters in the Sentinel-3A SRAL data editing procedures.

**Table 2.**
Thresholds used for the main altimeter and radiometer parameters in the Sentinel-3A SRAL data editing procedures.

Parameter | Minimum | Maximum |
---|

Orbit-Range | −130 m | 100 m |

Sea level Anomaly | −2 m | 2 m |

Number of 20 Hz range measurements | 10 | - |

Standard deviation of 20 Hz range measurements | 0 m | 0.2 m |

Dry tropospheric correction | −2.5 m | −1.9 m |

Wet tropospheric correction | −0.5 m | −0.001 m |

Dual frequency ionosphere correction | −0.4 m | 0.04 m |

Sea state bias correction | −0.5 m | 0 m |

Backscattering coefficient | 5.0 dB | 28.0 dB |

Standard deviation of 20 Hz Sigma0 measurements | 0 dB | 0.7 dB |

Number of 20 Hz Sigma0 measurements | 10 | - |

Significant wave height | 0 m | 11 m |

Wind speed | 0 m/s | 30 m/s |

Ocean tide | −5 m | 5 m |

Solid earth tide | −1 m | 1 m |

Pole tide | −0.15 m | 0.15 m |