NASA’s ICESat-2 mission launched in September 2018 carrying a single instrument, the Advanced Topographic Laser Altimeter System (ATLAS). ATLAS uses a high-repetition-rate, low-pulse-energy laser with its output split into six beams and a photon-counting receiver to measure Earth surface elevation with centimeter-level precision, repeating its ground track every 91 days. During more than four years of on-orbit operation, ATLAS has met or exceeded its lifetime and performance requirements. We present performance measurements, trends and projections for several instrument parameter, including transmitted laser pulse energy, receiver sensitivity, the instrument’s impulse response, transmitter/receiver alignment, dead-time behavior, and elevation measurement performance. The laser energy setting was increased in September 2023, for the first time, to maintain ranging performance at its earlymission level. The trends in instrument parameters indicate capability to continue on-orbit operation of ATLAS for many years into the future.
The Ice, Cloud, and land Elevation Satellite – 2 (ICESat-2) satellite mission launched in September 2018 from Vandenberg Air Force Base in California USA. The sole instrument is the photon-counting lidar Advanced Topographic Laser Altimeter System (ATLAS). Optimized to measure elevation change over the polar ice sheets and sea ice freeboard, ATLAS collects data globally. ICESat-2 data was released to the public in May 2019, and initial science discoveries are beginning to appear in the scientific literature. We describe the main components of the ICESat-2 mission, the standard data products, and our initial assessment of the on-orbit performance of the ATLAS instrument.
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