GNSS-R双基SAR成像运动误差分析及补偿
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摘要
针对GNSS-R双基SAR成像系统中存在的运动误差问题,建立基于GNSS-R信号的成像仿真系统:分析接收机运动误差对成像结果的影响并给出解决方法,重点分析恒定速度误差、线性速度误差和周期性速度误差3种情况;并通过频域相位的方法进行误差参数运动补偿。仿真结果表明,运动补偿后的图像分辨率显著提高,验证了算法对GNSS-R SAR系统运动补偿的有效性。
Aiming at the problem that there exist motion errors in GNSS-R bistatic SAR imaging system, the paper proposed a simulation system of imaging with GNSS-R signals: the influence of the motion errors of receivers on imaging results was analyzed with corresponding solution, and the constant velocity error, the linear velocity error and the periodic velocity error were focused on; then the method of frequency domain phase was used to make the motion compensation of error parameters. Simulational result showed that the image resolution with motion comensation could be improved significantly, which verified the validity of the motion compensation for GNSS-R SAR system by the proposed method.
Aiming at the problem that there exist motion errors in GNSS-R bistatic SAR imaging system, the paper proposed a simulation system of imaging with GNSS-R signals: the influence of the motion errors of receivers on imaging results was analyzed with corresponding solution, and the constant velocity error, the linear velocity error and the periodic velocity error were focused on; then the method of frequency domain phase was used to make the motion compensation of error parameters. Simulational result showed that the image resolution with motion comensation could be improved significantly, which verified the validity of the motion compensation for GNSS-R SAR system by the proposed method.
引文
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[15]龚连银.机载双基地SAR成像和运动补偿技术研究[D].成都:电子科技大学,2012.
[16]孙丽.复杂运动平台SAR运动补偿算法研究[D].成都:电子科技大学,2015.
[2]谢钢.GPS原理与接收机设计[M].北京:电子工业出版社,2009.
[3]MARTIN-NEIRA M.A passive reflectometry and interferometry system(PARIS)application to ocean altimetry[J].Esa Journal,1993,17(4):331-355.
[4]高洪兴,杨东凯,张波,等.基于GNSS卫星反射信号的海冰厚度探测[J].电子与信息学报,2017,39(5):1096-1100.
[5]王峰,杨东凯.星载GNSS-R辅助海洋盐度探测方法[J].北京航空航天大学学报,2018,44(1):108-116.
[6]GUTMANN E D,LARSON K M,WILLIAMS M W,et al.Snow measurement by GPS interferometric reflectometry:an evaluation at Niwot Ridge,Colorado[J].Hydrological Processes,2012,26(19):2951-2961.
[7]RODRIGUEZALVAREZ N,BOSCHLLUIS X,CAMPS A,et al.Soil moisture retrieval using GNSS-R techniques:experimental results over a bare soil field[J].IEEE Transactions on Geoscience&Remote Sensing,2009,47(11):3616-3624.
[8]杨磊,朱云龙,杨东凯.GNSS-R信号的海面SAR成像应用[J].导航定位学报,2017,5(3):94-100.
[9]杨东凯,张益强,张其善,等.基于GPS散射信号的机载海面风场反演系统[J].航空学报,2006,27(2):310-313.
[10]CAFFORIO C,PRATI C,ROCCA F.SAR data focusing using seismic migration techniques[J].IEEE Transactions on Aerospace and Electronic Systems,1991,27(2):194-207.
[11]RANEY R K,RUNGE H,BAMLER R,et al.Precision SAR processing using chirp scaling[J].IEEE Transactions on Geoscience&Remote Sensing,1994,32(4):786-799.
[12]WONG F W,YEO T S.New applications of nonlinear chirp scaling in SAR data processing[J].IEEE Transactions on Geoscience&Remote Sensing,2002,39(5):946-953.
[13]WEIB M.Synchronisation of bistatic radar systems[J].IEEE International Geoscience and Remote Sensing Symposium,2004(3):1750-1753.
[14]BENVENISTE A,GOURSAT M,RUGET G.Robust identification of a nonminimum phase system:blind adjustment of a linear equalizer in data communications[J].IEEE Transactions on Automatic Control,2003,25(3):385-399.
[15]龚连银.机载双基地SAR成像和运动补偿技术研究[D].成都:电子科技大学,2012.
[16]孙丽.复杂运动平台SAR运动补偿算法研究[D].成都:电子科技大学,2015.