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

摘要/Abstract

摘要：

海洋4A散射计将是世界上首个采用相控阵数字波束合成体制的星载微波散射计。其中，相控阵散射计高精度测量的实现依赖于散射计系统中各通道的一致性，因此需要实时对各通道的幅度和相位进行校正，以确保阵列能够正确地合成所需的波束。针对此问题, 提出了一种相控阵散射计通道幅相实时校正算法，所提算法采用现场可编程门阵列(field-programmable gate array, FPGA)实现，利用FPGA的并行处理能力和高速性能，对接收到的信号进行实时处理，实现了通道的幅度和相位校准。仿真、FPGA硬件调试以及实测数据分析表明，所提算法能够有效地对通道进行幅相校正，其校正的幅度和相位平均误差小于1%;所提算法提高了数字波束合成的性能，为相控阵散射计的高精度测量提供了可行性。

关键词: 海洋4A卫星, 现场可编程门阵列, 相控阵散射计, 幅相校正算法

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

中图分类号:

刘永庆, 刘鹏, 云日升, 张祥坤, 王特. 海洋4A散射计幅相校正算法FPGA优化实现[J]. 系统工程与电子技术, 2024, 46(8): 2554-2562.

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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参考文献 32

1	ZHANG X K, LIU H. Design of phased array microwave scatterometer with digital beam forming technique in active and passive combining observation system for sea surface salinity[C]//Proc. of the IEEE International Geoscience and Remote Sensing Symposium-IGARSS, 2013: 1563-1566.
2	牛立杰, 刘浩, 武林, 等. 面向星载海洋盐度探测应用的L波段综合孔径辐射计原理样机研制与试验研究[J]. 电子与信息学报, 2017, 39 (8): 1841- 1847.
	NIU L J , LIU H , WU L , et al. Prototype development and experimental study of L-band synthetic aperture radiometer for satellite-based ocean salinity detection applications[J]. Journal of Electronics & Information Technology, 2017, 39 (8): 1841- 1847.
3	FREEDMAN A, MCWATTERS D, SPENCER M. The aquarius scatterometer: an active system for measuring surface roughness for sea-surface brightness temperature correction[C]//Proc. of the International Symposium on Geoscience and Remote Sensing, 2006: 1685-1688.
4	MA W T , LIU G H , YU Y , et al. Roughness correction method for salinity remote sensing using combined active/passive observations[J]. Acta Oceanologica Sinica, 2021, 40 (11): 189- 195. doi: 10.1007/s13131-021-1744-z
5	朱杰. 主被动海面盐度测量中目标后向散射系数建模研究[D]. 北京: 中国科学院研究生院(空间科学与应用研究中心), 2015.
	ZHU J. Study on modeling of target backscattering coefficient in active and passive sea surface salinity measure ments[D]. Beijing: University of Chinese Academy of Sciences (Center for Space Science and Applied Research), 2015.
6	LI B , TIAN L Y , CHEN D Q , et al. An adaptive dwell time scheduling model for phased array radar based on three-way decision[J]. Journal of Systems Engineering and Electronics, 2020, 31 (3): 500- 509. doi: 10.23919/JSEE.2020.000030
7	封淑青, 廖润贵, 周威威, 等. 多通道相控阵天线数字波束合成技术及实现[J]. 上海航天(中英文), 2023, 40 (1): 156- 160.
	FENG S Q , LIAO R G , ZHOU W W , et al. Digital beamforming technology and implementation of multi-channel phased array antenna[J]. Shanghai Aerospace (Chinese and English), 2023, 40 (1): 156- 160.
8	林智煌. 基于多级FPGA的可扩展DBF模块研究[D]. 北京: 北京工业大学, 2021.
	LIN Z H. Research on scalable DBF module based on multi-level FPGA[D]. Beijing: Beijing University of Technology, 2021.
9	CHEN Z T, LIU J W, LI L. Design of scalable beam steering system of phased array radar[C]//Proc. of the IEEE CIE International Conference on Radar, 2011: 1153-1156.
10	江天洲. 相控阵雷达发射数字波束形成的设计与实现[D]. 西安: 西安电子科技大学, 2014.
	JIANG T Z. Design and implementation of digital beamforming for phased array radar transmitter[D]. Xi'an: Xidian University, 2014.
11	JIN X D, XU D L, WANG H. A method of channel callbration using periodic monitoring for phased array radar based on FPGA[C]//Proc. of the IET International Radar Conference, 2020: 761-766.
12	WANG M, WANG Q, LIANG K. A channel error calibration method for circular array radar based on curve fitting[C]//Proc. of the IEEE 5th International Conference on Electronics Technology, 2022: 853-856.
13	徐青, 廖桂生, 马仑. 一种新的波达方向与幅相误差联合估计方法[J]. 系统工程与电子技术, 2008, 30 (12): 2294- 2297. doi: 10.3321/j.issn:1001-506X.2008.12.003
	XU Q , LIAO G S , MA L . A new method for joint estimation of wave arrival direction and phase-amplitude error[J]. Systems Engineering and Electronics, 2008, 30 (12): 2294- 2297. doi: 10.3321/j.issn:1001-506X.2008.12.003
14	STAVROPOULOS K V, MANIKAS A. Array calibration in the presence of unknown sensor characteristics and mutual coupling[C]//Proc. of the European Signal Processing Conference, 2000.
15	王新新, 赵冬至, 杨建洪, 等. 海表面盐度卫星微波遥感研究进展[J]. 遥感技术与应用, 2012, 27 (5): 671- 679.
	WANG X X , ZHAO D Z , YANG J H , et al. Research progress in microwave remote sensing of sea surface salinity from satellites[J]. Remote Sensing Technology and Application, 2012, 27 (5): 671- 679.
16	HOLLINGER J . Passive microwave measurements of sea surface roughness[J]. IEEE Trans.on Geoscience and Remote Sensing, 1971, 9 (3): 165- 169.
17	SWIFT C T , MCINTOSH R E . Considerations for micro-wave remote sensing of ocean-surface salinity[J]. IEEE Trans.on Geoscience and Remote Sensing, 1983, 21 (4): 480- 491.
18	FORE A G , YUEH S H , TANG W Q , et al. Combined active/passive retrievals of ocean vector wind and sea surface salinity with SMAP[J]. IEEE Trans.on Geoscience and Remote Sensing, 2016, 54 (12): 7396- 7404. doi: 10.1109/TGRS.2016.2601486
19	FONT J , CAMPS A , BORGES A , et al. SMOS: the challenging sea surface salinity measurement from space[J]. Proceedings of the IEEE, 2010, 98 (5): 649- 665. doi: 10.1109/JPROC.2009.2033096
20	HWANG P A , AINSWORTH T L . L-band ocean surface roughness[J]. IEEE Trans.on Geoscience and Remote Sensing, 2020, 58 (6): 3988- 3999. doi: 10.1109/TGRS.2019.2960130
21	蔡乾. 阵列通道幅相校正及其实现[D]. 西安: 西安电子科技大学, 2010.
	CAI Q. Amplitude and phase calibration of array channels and its implementation[D]. Xi'an: Xidian University, 2010.
22	SADOWY G , GHAEMI H , HEAVEY B , et al. An integrated radar tile for digital beamforming X-/Ka-band synthetic aperture radar instruments[J]. IEEE Trans.on Microwave Theory and Techniques, 2019, 67 (3): 1197- 1206. doi: 10.1109/TMTT.2018.2889038
23	KINGHORN T, SCOTT I, TOTTEN E. Recent advances in airborne phased array radar systems[C]//Proc. of the IEEE International Symposium on Phased Array Systems and Technology, 2016.
24	张毅. 连续波相控阵雷达信号处理FPGA实现研究[D]. 成都: 电子科技大学, 2019.
	ZHANG Y. Research on FPGA implementation of continuous wave phased array radar signal processing[D]. Chengdu: University of Electronic Science and Technology of China, 2019.
25	LU Y E, YAN Y G, YUAN J G, et al. The effect of channel mismatch and mutual coupling on GPS adaptive antenna array[C]//Proc. of the International Conference on Radar, 2006.
26	CANTRELL B , DE-GRAAF J , WILLWERTH F , et al. Development of a digital array radar (DAR)[J]. IEEE Aerospace and Electronic Systems Magazine, 2002, 17 (3): 22- 27. doi: 10.1109/62.990350
27	LI W, LIN J, WANG W, et al. Method of multi-channel calibration for digital array radar[C]//Proc. of the European Radar Conference, 2015: 533-536.
28	SCHMID C M , SCHUSTER S , FEGER R , et al. On the effects of calibration errors and mutual coupling on the beam pattern of an antenna array[J]. IEEE Trans.on Antennas and Propagation, 2013, 61 (8): 4063- 4072.
29	ZHANG W, YANG M, CHEN B, et al. A phase error calibration method for distributed VHF radar system[C]//Proc. of the CIE International Conference on Radar, 2016.
30	ZENG Y, WANG Y, CHEN Z, et al. Two-dimensional OAM radar imaging using uniform circular antenna arrays[C]//Proc. of the 14th European Conference on Antennas and Propagation, 2020.
31	YUAN H , CHEN Y J , LUO Y , et al. A resolution-improved imaging algorithm based on uniform circular array[J]. IEEE Antennas and Wireless Propagation Letters, 2022, 21 (3): 461- 465.
32	LIU K , LIU H , WEI E I , et al. Backward scattering of electrically large standard objects Illuminated by OAM beams[J]. IEEE Antennas and Wireless Propagation Letters, 2020, 19 (7): 1167- 1171.

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

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[4]	唐林波, 陶芬芳, 赵保军, 刘嘉骏. 基于FPGA的实时整数霍夫变换[J]. Journal of Systems Engineering and Electronics, 2012, 34(3): 610-613.
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