新型对流层折射融合修正法提高GNSS-IR测高精度  

Novel tropospheric refraction fusion correction method to improve GNSS-IR altimetry accuracy

作　　者：祝会忠[1] 文建宇 沈祎凡 王强 ZHU Huizhong;WEN Jianyu;SHEN Yifan;WANG Qiang(School of Surveying,Mapping and Geography,Liaoning Technical University,Fuxin,Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学测绘与地理科学学院,辽宁阜新123000

出　　处：《测绘科学》2024年第6期1-9,共9页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(42030109,42074012);兴辽英才计划项目(XLYC2203162)。

摘　　要：针对GNSS-IR测高中对流层折射修正的驱动数据时空分辨率较低问题,该文提出了以GPT2W模型为基础,利用ERA5数据集,引入新型对流层折射的融合修正法(NTRF),获得高时空分辨率的温度和压强数据,提高了GNSS-IR测高精度。利用3个GNSS测站在两种时间长度上进行海面测高。第一,通过NTRF与未进行对流层改正的结果相比,探究对流层折射对于海面测高的影响大小与NTRF的修正效果;第二,将NTRF与传统GPT2W的结果比较,探究更加细致的驱动数据对于测高精度的影响。结果表明,NTRF能够提高测高精度,3个测站精度长时序平均提升17.43%,短时序平均提升19.36%。与传统GPT2W相比较,长时序精度相当,短时序最高提升1.4 mm。证明NTRF能够修正对流层折射误差,提高GNSS-IR海面测高精度。Aiming at the problem of low temporal and spatial resolution of the driving data for tropospheric refraction correction in GNSS-IR measurements, this paper proposes to introduce Novel Tropospheric Refraction Fusion Correction Method(NTRF) to obtain high temporal and spatial resolution temperature and pressure data based on the GPT2W model using the ERA5 dataset to improve the altimetry accuracy of GNSS-IR measurements. Three GNSS stations are utilized for sea surface height measurements at two times lengths. First, the magnitude of the effect of tropospheric refraction on sea level measurement is investigated by NTRF compared to the results without tropospheric correction with the correction effect of NTRF. Second, the results of NTRF are compared with those of conventional GPT2W to explore the effect of more detailed drive data on altimetry accuracy. The results show that NTRF is able to improve altimetry accuracy, with an average improvement of 17.43% in long time series and 19.36% in short time series for the three stations. Compared with the traditional GPT2W,the long time series accuracy is comparable and the short time series accuracy is increased by 1.4 mm, which proves that NTRF can effectively correct the tropospheric refraction error and improve the GNSS-IR sea level measurement accuracy.

关 键 词：GNSS-IR 海面测高 对流层折射改正 数据融合 温度和压强 

分 类 号：P228[天文地球—大地测量学与测量工程]