Level-1 Calibration Products - Sentinel-3 Altimetry Technical Guide - Sentinel Online
The Level-1 CAL product is outputted during Level-1 processing and is an internal product only. It is not available to users.
An SRAL Level-1 product contains one calibration data file containing the Level-1 calibration parameters for the calibration nominal scenario:
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L1B_CAL1_LRM_IQ: Level-1 Point Target Response (PTR) calibration measurements in LRM mode for I, Q configuration
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L1B_CAL1_SAR_Norm: Level-1 PTR calibration measurements in SAR mode
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L1B_CAL1_SAR_Auto: Level-1 PTR calibration measurements in SAR mode / AGC calibration
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L1B_CAL2_SAR_Ku: Level-1 Gain Profile Range Window (GPRW) calibration measurements – Ku-band (SAR mode)
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L1B_CAL2_SAR_C: Level-1 GPRW calibration measurements – C-band (SAR mode)
The main parameters available for Level-1 CAL1 PTR measurements are:
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time-tag and geo-location
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PTR total and maximum power
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difference of travel between the transmission and the reference lines
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PTR main lobe width
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PTR secondary lobes features
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burst power and phase corrections (SAR mode only)
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AGC correction tables (AGC calibration only).
The main parameters available for Level-1 CAL2 GPRW measurements are:
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time-tag and geo-location
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GPRW maximum value location
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left side GPRW features: mean value, standard deviation, difference between minimum and maximum values, and slope of the linear regression
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right side GPRW features: mean value, standard deviation, difference between minimum and maximum values, and slope of the linear regression
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GPRW normalised samples.