基于GNSS-R的城市近海岸水位高度反演研究

Research on Retrieval of Water Level Height in Urban Coast Based on GNSS-R

利用全球导航卫星系统反射技术(Global Navigation Satellite System Reflection,GNSS-R)监测海平面高度变化成为目前的热点。针对目前主要基于单系统反演海平面高度变化的研究,通过分析采用信噪比测量海平面高度原理,以BRST测站为例,对比分析采用单系统GPS、GLONASS以及两者联合反演的效果。经理论分析和实验表明:①利用单系统GPS、GLONASS以及两者联合反演海平面高度,反演结果的相关系数r均达到0.89以上,但基于单系统的反演结果,其时间分辨率较低。②利用GPS+GLONASS联合反演不仅反演结果更加稳定、精确可靠,而且进一步提高了时间分辨率,更有利于海平面变化的连续监测。

Using global navigation satellite system reflection(GNSS-R)to monitor sea level change has become a hot spot.In view of the current research mainly based on single system inversion of sea level height change,through the analysis of the principle of using signal-to-noise ratio to measure sea level height,taking BRST station as an example,the effect of single system GPS,GLONASS and their joint inversion is compared and analyzed.The theoretical analysis and experimental results show that:①Using single system GPS,GLONASS and their joint inversion of sea level height,the correlation coefficient r of inversion results are all above 0.89,but the time resolution based on single system inversion results is low.②Using GPS+GLONASS joint inversion not only makes the inversion results more stable,accurate and reliable,but also further improves the time resolution,which is more conducive to continuous monitoring of sea level changes.