| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
| ALT | Operational | Global ocean topography, sea level and gravity field measurements. | n/a |  |
| AltiKa | Operational | Sea surface height. | n/a | |
| AMR | Operational | Altimeter data to correct for errors caused by water vapour and cloud-cover. Also measures total water vapour and brightness temperature. | n/a | |
| AMR-C | Operational | Capabilities of the AMR with the addition of an on-board calibrator for high stability wet-tropospheric path delay correction. | n/a | |
| AMR-S | Operational | Capabilities of the AMR with the addition of a 2nd beam to provide wet-tropospheric path delay correction within both swaths of the primary radar instrument (KaRIn) | n/a | |
| DORIS-NG | Operational | Precise orbit determination; Real time onboard orbit determination (navigation). | n/a | |
| GPSP | Operational | Precision orbit determination. | n/a | |
| Ka-band Radar Interferometer (KaRIn) | Operational | Swath mapping radar altimeter that provides measurements for surface water. | n/a | |
| LRA | Operational | Baseline tracking data for precision orbit determination and/or geodesy. Also for calibration of radar altimeter bias. Several types used on various missions. (ASI involved in LAGEOS 2 development). | n/a | |
| POSEIDON-3B Altimeter | Operational | Nadir viewing sounding radar for provision of real-time high precision sea surface topography, ocean circulation and wave height data. | n/a | |
| POSEIDON-3C Altimeter | Operational | Nadir viewing sounding radar for provision of real-time high precision sea surface topography, ocean circulation and wave height data. | n/a | |
| Poseidon-4 Altimeter | Operational | Nadir viewing sounding radar for provision of real-time high-precision sea surface topography, ocean circulation and wave height data. | n/a | |
| SRAL | Operational | Marine and land services. | n/a | |
| IRIS | Being developed | Ku-band Interferometric Synthetic Aperture Radar Altimeter (with added Ka-band channel for snow depth retrieval and in combination with AMR-CR MW Radiometer for ice&snow classification and wet troposphere correction) to cover the needs for continuous monitoring of sea ice
thickness and land ice elevation measurement after Cryosat-2, with enhanced performance. | n/a | |
| Poseidon-5 Altimeter | Being developed | | n/a | |
| SAOOH | Being developed | | n/a | |
| AMR-CR | Approved | Capabilities of the AMR with the addition of an on-board calibrator for high stability wet-tropospheric path delay correction and a redesign with respect to AMR-C (i.e. the 3 high res MW radiometer channels at 90, 130 and 166 GHz are an integral subsystem of the instrument and not experimental as in AMR-C) | n/a | |
| LTI | Approved | The aim of MAGIC is to obtain high-resolution measurements in space and time and include the capability to determine the variations in gravity field due to mass change in hydrology, cryosphere, oceanography, solid Earth and climate change signals so as to serve science and operational products including emergency services. | n/a | |