摘要
针对反射信号相对直射信号时延的全球定位系统(GPS)海面测高方法只适用于粗糙度较小的海面问题,提出一种基于多径前向模型的GPS海面测高方法.在近地接收条件下,GPS反射信号与直射信号存在多径干涉作用,使得单天线接收信号出现干涉振荡条纹,振荡频率与海面高度成线性关系,且不受海面粗糙度影响.基于多径前向模型的方法通过检测接收信号的干涉振荡频率反演海面高度.仿真结果验证了该方法用于海面测高的可行性和对海面粗糙度的鲁棒性,相比时延测高方法可适用于更广泛的海况.
The global positioning system(GPS)sea surface altimetry with time delay of reflected signal relative to direct signal is only suitable for sea surface with small roughness.In order to solve this problem,the paper proposes a new method of GPS sea surface altimetry based on multipath forward model.Under the condition of near-ground reception,there is multipath interference between GPS reflected signal and direct signal,causing interference oscillating fringes in the received signal of a single antenna.And the oscillation frequency is linearly related to the sea surface height and is not affected by sea surface roughness.The method based on multipath forward model is to retrieve sea surface height by detecting the interference oscillation frequency of the received signal.The simulation results show that the proposed method is feasible and robust to sea surface roughness and can be applied to a wider range of sea conditions than the time-delay altimetry method.
作者
贾瑞涛
刘振
JIA Ruitao;LIU Zhen(Air Force EarlyWarning Academy,Wuhan 430019,China)
出处
《空军预警学院学报》
2020年第6期428-433,439,共7页
Journal of Air Force Early Warning Academy
关键词
全球定位系统
海面测高
多径干涉
多径前向模型
GPS
sea surface altimetry
multipath interference
multipath forward model
