Abstract

AbstractThe improvement of the signal‐to‐noise (SN) ratio is one of the most important issues for the high resolution earth observation system. A time delay and integration (TDI) method combining plural CCD output signals should provide the solution for acquiring high SN ratio without increasing the optical diameter. However, for an actual satellite, there are various fluctuations in the satellite attitude or jitters from other equipment, which degrade the SN improvement ratio achieved by the time delay and integration method. This paper analyzes SN improvement ratio characteristics under the above fluctuations. the paper reveals optimum integration times and the maximum SN improvement ratio and also the requirement on satellite attitude variation and jitters from other equipment. the paper also discusses the methods to obtain the maximum SN improvement ratio using correlation detection between adjacent CCD for the time delay and integration method even under the presence of the above fluctuations.

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