无人机GNSS-R时延多普勒计算关键技术  

Key technology of UAV GNSS-R delay and Doppler calculation

作　　者：刘原华 刘张文 牛新亮[2] LIU Yuanhua;LIU Zhangwen;NIU Xinliang(School of Telecommunication and Information Engineering&School of Artificial Intelligence,Xi’an University of Posts&Telecommunications,Xi’an 710121,China;Xi’an Branch of China Academy of Space Technology,Xi’an 710000,China)

机构地区：[1]西安邮电大学通信与信息工程学院(人工智能学院),西安710121 [2]中国空间技术研究院西安分院,西安710000

出　　处：《导航定位学报》2021年第6期90-95,共6页Journal of Navigation and Positioning

基　　金：陕西省自然科学基础研究计划项目(2016JQ6033)。

摘　　要：针对海面风场反演中,采用不同的镜面反射点估计算法计算结果存在较大差异,导致等延迟环和等多普勒带的大小和分布不同,从而使得散射信号二维时延-多普勒相关功率计算的不一致等问题,提出在机载场景下,利用接收机相对于卫星发射机的仰角,来计算二维相关值参考点的时延和多普勒的方法。实验结果与实测数据对比表明,机载条件下,采用该方法计算真实有效,且无需计算镜面反射点的位置,简化了计算过程。There are big differences in the calculation results of different specular point estimation algorithms used in the sea surface wind field inversion,resulting in different sizes and distributions of the equal delay ring and equal Doppler zone,which makes the inconsistency of the scattered signal two-dimensional delay-Doppler correlation power.Aiming at the problems,a method was proposed to calculate the time delay and Doppler of the two-dimensional correlation value reference point by using the elevation angle of the receiver relative to the satellite transmitter in the airborne scene.The experimental results showed that the calculation of this method was true and effective under airborne conditions,and there was no need to calculate the position of the specular point,which simplified calculation process.

关 键 词：镜面反射点 时延 多普勒 卫星高度角 全球卫星导航系统反射信号 

分 类 号：P228[天文地球—大地测量学与测量工程]