Abstract
As a new type of radar altimeter, interferometric imaging radar altimeter (InIRA) adopts interferometric synthetic aperture radar (SAR) technology for ocean observation and has the characteristics of wide swath, imaging and high accuracy height measuring. Compared with traditional radar altimeter, InIRA has a huge data rate, which can reach 1 Gbps, and sometimes even exceed 5 Gbps. It is necessary to apply onboard real-time processing algorithm to reduce data downlink rate and storage onboard pressure. Flat-earth phase removal is an important step in InIRA real-time processing, which directly affects the effect of subsequent phase filtering. Conventional phase flattening algorithms are not suitable for InIRA, because InIRA applies small incident angle and InIRA interferogram has the property of “dense at near range while sparse at far range” In this paper, we propose an algorithm for flat-earth phase removal based on edge detection, which is suitable for InIRA ocean observation. This method calculates the position of the phase fringe step in interferogram through edge detection, and then reconstructs the flat-earth phase by interpolation. Compared with conventional phase flattening algorithms, this method is suitable for InIRA with small incident angle and has less computation.
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