一种基于北斗三号系统的GNSS-R海面干涉测高技术

GNSS-R干涉测高技术可用于中尺度海面高度观测，具有空间分辨率高、测量精度高等优势。与传统的GNSS-R本地码测高技术相比，GNSS-R干涉测高技术可以有效提升高度测量精度。虽然GNSS-R干涉测高技术已有一些研究，但是基于北斗三号的干涉测高应用还很少。本文根据GNSS-R干涉测高技术优势，针对北斗三号系统在干涉测高技术上的应用，研发了支持北斗三号的GNSS-R干涉测高接收机并描述了整体架构及实现。利用所研发的接收机进行水面干涉测高试验，首次获取了北斗三号B1和B2干涉测高波形，与传统GPS L1和北斗B1本地码测高波形进行对比。对两种方法计算出的水面高度进行对比，结果显示北斗三号干涉测高精度明显优于GPS L1和北斗B1传统本地码测高精度。 

A New GNSS-R Interferometric Ocean Altimetry Using Beidou-3 Signal

GNSS-R interferometric altimetry can be used for meso-scale sea level observation with the advantages of high spatial resolution and high measurement accuracy. Compared with the traditional GNSS-R which uses local code tracking for altimetry, GNSS-R interferometric could effectively improve the altimetry accuracy. Although a lot of researches had been carried out in GNSS-R interferometric altimetry around the world, there are few researches in the application of interferometric altimetry using Beidou-3 signal. This article introduces the basic theory of GNSS-R interferometric altimetry technology and its advantages. Aiming at the application of Beidou-3 signal in interferometric altimetry, a GNSS interferometric altimetry instrument had been developed. The overall architecture and implementation of this new instrument is introduced in this paper. An open-field GNSS-R water surface altimetry experiments was conducted using this instrument. In the experiment, the interferometric waveforms generated from Beidou-3 B1 and B2 signal were obtained for the first time, and were compared with the traditional GPS L1 and Beidou-2 B1 local code tracking waveforms. Finally, the inversion results of the water surface height calculated by the two approaches are compared. The comparison results show that the precision of Beidou-3 system’s interferometric measurement is significantly better than that of GPS L1 and Beidou-2 B1 traditional local code altimetry.