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NASA's program in lidar remote sensing

Until a few years ago, virtually all NASA''s remote sensing was done passively. NASA is now working to develop active remote sensing systems, making use of the very rapid advances occurring in laser and radar technology. To be deployed in the difficult space environment, laser instruments must be rugged enough to withstand vibrations and cold while being able to operate automatically without retuning or realigning the instrument by hand. This paper describes several major NASA research efforts in lidar remote sensing, including hardware and key sensor issues, along with results and expectations.