The present master thesis is composed of three main parts and deals with the planned atmospheric and climate satellite occultation mission called ACCURATE?climate benchmark profiling of greenhouse gases and thermodynamic variables and wind from space. The performance analysis is based on individual-profile errors as starting point given from the ACCURATE observational requirements and obtained from pre-studies. Three representative satellite constellations, two-, four- and twelve-satellites, respectively, were simulated with the simulation software EGOPS.The twelve-satellite constellation meets all requirements regarding data density and horizontal sampling. However, the more cost effective two satellite case addresses all aspects of scientific return and appears to be ideal as an initial demonstration case, e.g., in regard to the currently planned ESA Explorer Mission.The presently prepared ESA-IRDAS-EXP Tx-to-Rx crosslink demonstration experiment, which will take place on two islands on the Canary?s, should demonstrate the novel ACCURATE LIO technique. LIO provides accurate concentrations of the main greenhouse gases in the upper troposphere and lower stratosphere region. The focus of the absorption simulation analysis lies in particular on the LIO C18OO, 13CO2, 12CO2, H2O and CH4 absorption lines in the short wave infrared band on the Canary Islands. For this purpose, additional more sensitive demo-absorption lines for these lower heights are necessary. The simulation was done by using RFM supported by HITRAN. Real local atmospheric variables during a 10-year time interval for four significant seasonal months, during day and night, were processed for the simulation.The results show that all suggested additional demonstration lines are well chosen within the SWIR range. It turns out that the month April is scientifically preferred, whereas October is less preferable, for the realization of the demonstration experiment. Thus, it is now planned in April 2011.