Abstract
As a new type of radar altimeter, interferometric imaging radar altimeter (InIRA) is used to realize high accuracy of sea-level elevation measurement and wide swath observation. Compared with traditional radar altimeter, InIRA applies the technology of interferometric synthetic aperture radar (SAR), so there is a high requirement of onboard memory and downlink speed for InIRA. In order to reduce data rate, InIRA must adopt onboard real-time processing. After image focusing and interferometric processing, the radar echo data will be transformed into interferometric phase, and the data rate will be greatly reduced. Range migration correction is a part of InIRA real-time processing, but range migration correction requires interpolation calculation, which requires long computing time and high resource consumption. Based on the InIRA simulation model, this paper analyzes the height measurement error caused by range migration, and verified by the processing result of Tiangong-2 InIRA. The results show that the height measurement error introduced by range migration is small enough to ignore range migration correction in InIRA real-time processing under certain condition.
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