| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
ALT
Radar Altimeter | Operational
| Global ocean topography, sea level and gravity field measurements. | Radar altimeter |  |
AltiKa
Ka-band Altimeter | Operational
| Sea surface height. | Radar altimeter | |
C-Band SAR
C-Band Synthetic Aperture Radar | Operational
| Marine core services, land monitoring and emergency services. Monitoring sea ice zones and arctic environment. Surveillance of marine environment, monitoring land surface motion risks, mapping of land surfaces (forest, water and soil, agriculture), mapping in support of humanitarian aid in crisis situations. | Imaging radar (SAR) | |
POSEIDON-3B Altimeter
Positioning Ocean Solid Earth Ice Dynamics Orbiting Navigator (Single frequency solid state radar altimeter) | Operational
| Nadir viewing sounding radar for provision of real-time high precision sea surface topography, ocean circulation and wave height data. | Radar altimeter | |
Poseidon-4 Altimeter
Poseidon-4 SAR Radar Altimeter | Operational
| Nadir viewing sounding radar for provision of real-time high-precision sea surface topography, ocean circulation and wave height data. | Radar altimeter | |
SAR (RADARSAT-2)
Synthetic Aperture Radar (SAR) C band | Operational
| All-weather images of ocean, ice and land surfaces. Used for monitoring of coastal zones, polar ice, sea ice, sea state, geological features, vegetation and land surface processes. | Imaging radar (SAR) | |
SAR (RCM)
Synthetic Aperture Radar (SAR) C band | Operational
| All-weather, C-band data to support ecosystem monitoring, maritime surveillance and disaster management. | Imaging radar (SAR) | |
SGR-ReSI-CDHS
Space GNSS Receiver - Remote Sensing Instrument, CoreDHS avionics | Operational
| Ocean winds, waves, soil moisture, flooding, ice, snow. Similar to SGR-ReSI-Z, but with a smaller Zynq, and only supports 2 RF channels, only allowing collection of single frequency and single polarisation. | n/a | |
SRAL
SAR Radar Altimeter | Operational
| Marine and land services. | Radar altimeter | |
SWIM
Surface Waves Investigation and Monitoring | Operational
| Ku-band Real-aperture radar (RAR) system, multi-incindence beams(0-10°) and azimuth scanning. Measurement of 2D ocean waves spectrum | n/a | |
IRIS
Interferometric Radar Altimeter for Ice and Snow | 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 the sea ice
thickness and land ice elevation measurement after Cryosat-2 with enhanced performance. | Radar altimeter | |
SGR-ReSI-Z
Space GNSS Receiver - Remote Sensing Instrument (Zynq based) | Being developed
| Ocean winds, waves, soil moisture, flooding, ice, snow | n/a | |
POSEIDON-3C Altimeter
Positioning Ocean Solid Earth Ice Dynamics Orbiting Navigator (Single frequency solid state radar altimeter) | Approved
| Nadir viewing sounding radar for provision of real-time high precision sea surface topography, ocean circulation and wave height data. | Radar altimeter | |