海洋4A散射计幅相校正算法FPGA优化实现

doi:10.12305/j.issn.1001-506X.2024.08.03

Abstract

Abstract:

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.

Key words: ocean 4A satellite, field-programmable gate array (FPGA), phased-array scatterometer, amplitude and phase correction algorithm

CLC Number:

Yongqing LIU, Peng LIU, Risheng YUN, Xiangkun ZHANG, Te WANG. FPGA optimization implementation of amplitude and phase correction algorithm for ocean 4A scatterometer[J]. Systems Engineering and Electronics, 2024, 46(8): 2554-2562.

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资源	利用个数	可用资源	利用率/%
LUT	1 078	203 800	0.52
MUXES	90	101 900	0.09
Register	1 007	407 600	0.25
DSP	3	840	0.36

FPGA optimization implementation of amplitude and phase correction algorithm for ocean 4A scatterometer

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