毫米波辐射计数字相关器的设计
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摘要
在微波遥感领域,基于FPGA的数字相关器在集成度、可变积分时间、最大通道数等方面具有很大的优势。数字相关器使用单片逻辑资源丰富的FPGA——XC7V2000T即完成70个通道的数字相关处理,文章给出了相关器时钟拓扑和电源网络设计,软件设计中给出了相位同步方法和关键时序优化措施。经过测试,数字相关器通道间相位差异小于100ps,反演成像效果良好。
In the field of microwave remote sensing,the digital correlator based on FPGA has great advantages in terms of integration,variable integration time,and maximum channel number. The digital correlator uses a single-chip FPGA—XC7 V2000 T which is rich in logic resources to complete digital correlation processing between 70 channels. The article gives the correlator clock topology and power network design. The phase synchronization method and key timing optimization are given in the software design. Measures. After test,the phase difference between the digital correlator channels is less than100 ps,and the inversion imaging effect is good.
In the field of microwave remote sensing,the digital correlator based on FPGA has great advantages in terms of integration,variable integration time,and maximum channel number. The digital correlator uses a single-chip FPGA—XC7 V2000 T which is rich in logic resources to complete digital correlation processing between 70 channels. The article gives the correlator clock topology and power network design. The phase synchronization method and key timing optimization are given in the software design. Measures. After test,the phase difference between the digital correlator channels is less than100 ps,and the inversion imaging effect is good.
引文
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[3]韩东浩.旋转圆环阵列综合孔径微波辐射计系统研究[D].北京:中国科学院国家空间科学中心,2017.
[4]牛立杰.高稳定度干涉式综合孔径微波辐射计系统研究[D].北京:中国科学院国家空间科学中心,2017.
[5]任晓静,李赓,孙林,等.多通道数字相关器的优化设计[J].电子设计工程,2017(16):162-165.
[6] Kerr Y H,Al-Yaari A,Rodriguez-Fernandez N,et al. Overview of SMOS performance in terms of global soil moisture monitoring after six years in operation[J]. Remote Sensing of Environment,2016(180):40-63.
[7] Martínez-Fernández J, González-Zamora A,Sánchez N,et al. Satellite soil moisture for agricultural drought monitoring:Assessment of the SMOS derived Soil Water Deficit Index[J]. Remote Sensing of Environment,2016(177):277-286.
[8] Gaier T,Kangaslahti P,Lambrigtsen B,et al. A180 GHz prototype for a geostationary microwave imager/sounder-GeoSTAR-III[C]//2016 IEEE International Geoscience and Remote Sensing Symposium(IGARSS). IEEE,2016:2021-2023.
[9] Molaei A,Allan G,Heredia J,et al. Interferometric sounding using a compressive reflector antenna[C]//Antennas and Propagation(EuCAP),201610th European Conference on. IEEE,2016:1-4.
[10]金何韵潇,刘浩.基于FPGA的多种量化二元数字干涉仪[J].电子设计工程,2018,26(10):134-137.
[11]Zhang Y,Liu H,Wu J,et al. Method to reduce imaging errors in dynamic target observation of the geostationary interferometric microwave sounder[J].IEEE Geoscience and Remote Sensing Letters,2017,14(2):267-271.
[12]Han D,Liu H,Wu J,et al. Interelement phase calibration for the geostationary interferometric microwave sounder(GIMS)[J]. IEEE Geoscience and Remote Sensing Letters,2016,13(9):1216-1220.
[13]Devices A. LVPECL/24 CMOS output clock generator with integrated 2. 5 GHz VCO AD9520-1 data sheet[EB/OL].(2011-11-03). http://www.analog.com/static/imported-files/data_sheets/AD952 0-1. pdf.
[14]Zhang Q,Cheng L,Yin C. Design of Multi-channel Dual-frequency Digital Receiver based on FPGA[C]//Signal Processing(ICSP),2014 12th International Conference on. IEEE,2014:403-407.
[15]Xilinx. UG471-7 Series FPGAs SelectIO Resources User Guide(ver1.10)[EB/OL]. https://www.xilinx.com/support/documentation/user_guides/ug471_7Series_SelectIO.pdf,2018.
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[17]刘曙光,蔡运恒,贾晨辉,等.海洋钻机电气控制系统设计及关键技术[J].西安工程大学学报,2016(1):131-136.
[18]黄勇杰,田喜平.基于小波变换的模糊图像处理系统设计与实现[J].现代电子技术,2018,41(19):71-74,78.