FPGA optimization implementation of amplitude and phase correction algorithm for ocean 4A scatterometer
The Ocean 4A scatterometer is the world's first spaceborne microwave scatterometer employing a phased-array digital beamforming system.Achieving high-precision measurements in phased-array scatterometers relies on the consistency of individual channels within the system.Therefore,it necessitates real-time correction of the amplitude and phase of each channel to ensure the array accurately synthesizes the required beams.This paper presents a real-time amplitude and phase correction algorithm for phased-array scatterometer channels.The proposed algorithm is implemented using field-programmable gate array(FPGA),capitalizing on FPGA's parallel processing capabilities and high-speed performance to process received signals in real-time,thereby achieving amplitude and phase calibration for the channels.Simulations,FPGA hardware implementation,and analysis of measured data show that the proposed algorithm effectively corrects channel's amplitudes and phases,with an average error of less than 1％.The proposed algorithm enhances the synthetic performance of digital beamforming,demonstrating the feasibility of high-precision measurements in phased-array scatterometers.
ocean 4A satellitefield-programmable gate array(FPGA)phased-array scatterometeramplitude and phase correction algorithm
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