ALART Lidar Altimeter

ALART (Advanced Laser Ranging Technologies for Altimetry) is a photon-counting time-of-flight lidar altimeter developed under ESA Technology Research Programme contract T116-306MM.^[1] The instrument targets vegetation-height retrieval, bathymetry, and multispectral lidar extension applications, with a design path toward follow-on multispectral lidar systems.^[2][3]

The system operates at 532 nm with a pulse repetition frequency of 10,000 Hz across a three-beam configuration.^[3] Photon-counting detection achieves a vertical resolution of 0.047 m and a vertical accuracy of 120 mm over a 48 m full-scale range.^[3] The delivered airborne breadboard hardware has a mass of 10.6 kg and a power draw of 42 W.^[3]

The ESA TRP study (contract T116-306MM, closed 2016) was scoped for spaceborne Earth observation missions.^[1] The SPIE 2015 paper treats spaceborne vegetation-height retrieval as the primary design objective, with the 532 nm green channel selected to serve both canopy altimetry and shallow-water bathymetry scenarios.^[2] The hardware delivered under the programme is a TRL-4 airborne breadboard; operational spaceborne deployment has not been documented in available sources.^[3][1]

ALART is a demonstration-phase instrument. The cosine case study frames the airborne breadboard as a foundation for future lidar development, including multispectral and higher-channel-count variants.^[3]