ECHO_PLRM product - Sentinel-3 Altimetry Technical Guide

The Level-1 ECHO_PLRM product contains all L1B tracking measurements in pseudo-LRM (PLRM) mode, at 20 Hz rate and for both Ku and C band.

The main parameters of Level-1 ECHO_PLRM product are:

Table 1: Level-1 ECHO_PLRM product main parameters

Parameter name	Description	Units
time_l1b_echo_plrm	UTC time seconds elapsed since January 1^st 2000 00:00:00	seconds
lat_l1b_echo_plrm	Latitude	1.00e-06 degrees North
lon_l1b_echo_plrm	Longitude	1.00e-06 degrees East
surf_type_l1b_echo_plrm	Altimeter surface type	0b:open_ocean_or_semi-enclosed_seas 1b:enclosed_seas_or_lakes 2b:continental_ice 3b:land
range_ku_l1b_echo_plrm range_c_l1b_echo_plrm	Tracker range (Ku or C band) corrected for USO frequency drift, internal path delay and Doppler corrections.	1.00e-04 meters (unit) 700000 meters (offset to be added)
sig0_cal_ku_l1b_echo_plrm sig0_cal_c_l1b_echo_plrm	Scaling factor (Ku or C band) for sigma0 evaluation corrected for AGC instrumental errors and internal calibration	1.00e-02 dB
i2q2_meas_ku_l1b_echo_plrm i2q2_meas_c_l1b_echo_plrm	I2+Q2 echo waveforms corrected for the GPRW instrumental effect	count (unit) 1.00e-03 (scale factor)