Questions have come up about the landing strategy of the Schiaparelli lander. It uses a Doppler radar to get position and velocity, time deployment of parachut

Questions have come up about the landing strategy of the Schiaparelli lander. It uses a Doppler radar to get position and velocity, time deployment of parachute, and calibrate thrust for retro-rockets. The best references I was able to find are these: http://exploration.esa.int/mars/47852-entry-descent-and-landing-demonstrator-module/ http://exploration.esa.int/mars/47852-entry-descent-and-land... http://solarsystem.nasa.gov/docs/Bayle_ExoMars_EDM_Overview-Paper.pdf http://solarsystem.nasa.gov/docs/Bayle_ExoMars_EDM_Overview-... (solid, is undated, seems old and nonspecific in some cases) https://solarsystem.nasa.gov/docs/7B.1_Lorenzoni_ExoMars%202016%20Entry%20Descent%20and%20Landing%20Demonstrator%20Module%20EDL%20overview.pdf https://solarsystem.nasa.gov/docs/7B.1_Lorenzoni_ExoMars%202... (from 2013, more detail)