COMPUTER SIMULATION OF AN AIRCRAFT-BASED DIFFERENTIAL ABSORPTION AND SCATTERING SYSTEM FOR RETRIEVAL OF S02 VERTICAL PROFILES

摘要

The feasibility of using the differential absorption and scattering technique from aircraft altitudes for remotely measuring the vertical distribution of SO2 is studied via a computer simulation. Particular care is taken in this simulation to use system parameters (i.e., laser energy, telescope size, etc.) which can be accom¬modated on an aircraft and can be realized with commercially available technology. The vertical molecular and aerosol profiles are chosen to simulate the types of pro¬files which might be experienced over a large city. Results are presented on the retrieval of the assumed SO2 profile which show the effects of systematic errors due to interfering gases and aerosols, as well as random errors due to shot noise in the return signal, detector and background noise, and instrument-generated noise.