摘要
GNSS-R是基于双基雷达散射机理的无源微波遥感技术,可同时接收多个镜面反射点的反射信号,实现海面高度、有效波高、海面风场、海冰等海态参数的宽刈幅探测。针对微纳卫星观测计划,研制国内首个星载微小型GNSS-R测高仪,开展外场实验,处理实验数据,采用基于本地码相关的Clean replica算法、干涉式互相关的Interferometric算法,根据曲线平滑算法对相延多普勒测图(DDM)曲线进行拟合,进而通过最大倒数点法(DER)、峰值半功率法(HALF)等镜点跟踪算法得到测高误差,对实验结果的预期和实测值进行分析,并提出改进方法。
GNSS-R is the passive microwave remote sensing technology based on bistatic radar scattering mechanism.It can receive several reflective signals simultaneously,and the remote sensing data can be used for the wide swath detection of the sea surface height,the significant wave height,the sea surface wind field,the sea ice,et al.According to the demand of nano-sat observation plan,the first domestic satellite-borne GNSS-R micro-altimeter is developed,and an experiment in Dishui Lake is conducted.For processing the raw data,we use two algorithms,one is Clean replica self-correlation,and the other is interferometric cross correlation.The reflective delay Doppler mapping(DDM)is smoothed,and then leading edge derivative(DER)and half of the peak power(HALF)are used to trace the single point.Finally,the expected value and the measured value are analyzed,and the method for improvement is proposed.
作者
秦瑾
孟婉婷
杜璞玉
冯剑锋
周勃
QIN Jin;MENG Wanting;DU Puyu;FENG Jianfeng;ZHOU Bo(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)
出处
《上海航天》
CSCD
2018年第2期103-109,共7页
Aerospace Shanghai
基金
上海市科委国际合作项目(17220730600)
国家电网公司总部科技项目
关键词
GNSS-R
相延多普勒测图
自相关
测高仪
海面高度反演
最大倒数点法
峰值半功率法
平滑算法
global navigation satellite system-reflection(GNSS-R)
delay Doppler mapping(DDM)
self-correlation
altimeter
sea height retrieval
leading edge derivative(DER)
half of the peak power(HALF)
smoothing spline algorithm
