全极化微波辐射计系统中高速数字相关器设计  

Design of High-Speed Digital Correlator in Fully Polarimetric Microwave Radiometer

作　　者：陆浩[1,2] 王振占[1] 刘憬怡[1] 姜景山[1] 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《电子学报》2011年第12期2831-2835,共5页Acta Electronica Sinica

摘　　要：海面风场直接影响大气与大洋环流相互作用,是研究海流运动规律的必要条件.全极化微波辐射计是一种用于海洋表面风场测量的新型被动微波遥感器.数字相关器是全极化辐射计的核心部件.文中详细介绍了一种新型数字相关器的设计和实现.两片高速A/D转换器采样四路信号并通过XILINX公司新一代的FPGA-Vertex5作相关运算.同时本文给出了数字相关器的测试结果.相关器采样率360MHz,8bit量化,测试有效位数在7.2bit以上.100MHz和150MHz信号输入下,测量值与理论值之间的相关系数在0.9999999以上.系统功耗11.3W.Fully polarimetric microwave radiometer is a new type of passive microwave sensor for measuring ocean wind vector.Digital correlation technology is used inside it to get all the four Stokes parameters of ocean emission in this paper.Digital correlator is the main part of the fully polarimetric radiometer.In the paper,design of a novel digital correlator is presented.Two high-speed,dual A/D converters are used to sample four signals,and the sampling results are operated in FPGA-Vertex5 to make both self-and cross-correlation calculations.The testing results of the correlator are given.The sampling rate is 360 MHz with effective number of bits more than 7.2 bits in 8 bits resolution.For both 100 MHz and 150 MHz input,the correlation coefficient between the measurements and their theoretical results is more than 0.9999999.The whole power of digital correlator is 11.3 W.

关 键 词：全极化微波辐射计 数字相关器 FPGA ADC 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]