摘要
GNSS-R(Global Navigation Satellite System-Reflections)技术是一种可用于海面参数遥感探测的新兴技术,是当前国内外的研究热点之一。GNSS海面反射信号的延迟多普勒图像(DelayDoppler Map,DDM)是GNSS-R技术应用的重要理论基础。基于Z-V模型确定了岸基GNSS反射信号DDM的理论仿真方法和流程,并进行了实验验证,实验结果显示,仿真DDM与实测DDM之间具有很好的一致性。同时,全面系统地分析了风速、风向、接收天线高度和卫星仰角4个参数对DDM变化特征的影响规律,仿真结果显示:风速和接收天线高度的影响呈单调特性;风向的影响呈周期特性;卫星仰角的影响则比较特殊,在30°以下时呈现明显的单调性,大于30°时误差几乎相同,即具有窗函数选择特性,这种变化特征为利用DDM反演海面波浪、风场数和海面粗糙度等参数提供了理论依据和参考。
The GNSS-R （Global Navigation Satellite System-Reflections） is a new technology used for remote sensing ocean surface, which is also an international research tocus. Delay-Doppler Maps （DDM） of coastal GNSS reflections are the most important precondition for the applications of GNSS-R technique, so the theoretical simulation method and procedure that based on Z-V model are established in detail and compared with experiment data in this paper. The comparisons show that the simulated DDM has a good consistency with the experimental one obtained by signal processing method. Meanwhile, the effects of wind speed, wind direction, the height of receiving antenna, and satellite elevations on DDM are theoretically investigated in detail. The analysis results show that the effects are very complex. The error curves of wind speed and antenna height are both monotonically increasing. Moreover, the error curves of wind direction periodically change. However, the error curves of satellite elevations are monotonically decreasing when the elevation is less than 30°, but the changes are unconspicuous when the elevations are over 30°. The appearance is consequently called window selection characteristic in this paper. The variation characteristics provide significant theoretical basis for retrievals of ocean wave, wind field, and surface roughness by using DDM information.
作者
王波
陈世哲
闫星魁
张可可
刘世萱
徐宇柘
WANG Bo;CHEN Shi-zhe;YAN Xing-kui;ZHANG Ke-ke;LIU Shi-xuan;XU Yu-zhe(Institute of Oceanographic Instrmentation,Qilu University of Technology（Shandong Academy of Sciences）,Qingdao 266061,Shandong Province,China;Shandong Provincial Key Laboratory of Ocean Enviromental Monitoring Technology,Qingdao 266061,Shandong Province,China;National Engineering and Technological Research Center of Marine Monitoring Equipment,Qingdao 266061,Shandong Province,China)
出处
《海洋技术学报》
2018年第5期33-39,共7页
Journal of Ocean Technology
基金
国家重点研发计划资助项目(2017YFC1403302)
山东省自然科学基金资助项目(ZR2017QD015
ZR2017LD011)
国家自然科学基金资助项目(61201097)
关键词
全球导航卫星系统
反射信号
延迟多普勒图像
波浪
global navigation satellite system （gnss）
reflections
delay-doppler map （ddm）
ocean wave
