Jiang Xingwei, Jia Yongjun, Zhang Youguang. Measurement analyses and evaluations of sea-level heights using the HY-2A satellite’s radar altimeter[J]. Acta Oceanologica Sinica, 2019, 38(11): 134-139. doi: 10.1007/s13131-019-1503-6
Citation: Jiang Xingwei, Jia Yongjun, Zhang Youguang. Measurement analyses and evaluations of sea-level heights using the HY-2A satellite’s radar altimeter[J]. Acta Oceanologica Sinica, 2019, 38(11): 134-139. doi: 10.1007/s13131-019-1503-6

Measurement analyses and evaluations of sea-level heights using the HY-2A satellite’s radar altimeter

doi: 10.1007/s13131-019-1503-6
  • Received Date: 2018-06-12
  • The HY-2A satellite is China’s first independent oceanic dynamic environmental satellite, and has been operating continuously for more than six years. The satellite’s radar altimeter, which is one of the main loads on the satellite, has the ability to realize all-weather and all-day observations of global sea-surface heights, as well as significant wave heights and sea-surface wind speeds. These observed data have been widely used in marine disaster prevention and reduction, along with resource development, maritime security and other fields. In order to achieve a comprehensive understanding of the multi-year overall observational performances of the HY-2A satellite’s radar altimeter, all of the observational data of the IGDR product from October 26, 2012 to August 27, 2017 were selected in this study for a comprehensive evaluation. The height measurement capability of the HY-2A satellite’s radar altimeter was evaluated using self-crossover and Jason-2 crossover methods. The height discrepancies at the self-crossover point of the HY-2A satellite’s ascending and descending orbits were also calculated. It was found that for the HY-2A satellite’s radar altimeter in global waters under the restriction conditions of ascending and descending orbits, the height anomaly differences were within a range of less than 30 cm. The absolute mean error was determined to be 5.81 cm, and the height anomaly standard deviation was 7.76 cm. Under the conditions of the observational areas being limited within a scope of 60° from the Equator, it was determined that the sea-level height anomaly differences were less than 10 cm at the junction of the ascending and descending orbits, the absolute mean error was 3.95 cm. In addition, the sea-level height anomaly standard deviation was observed to be 4.76 cm. Using a mutual cross method with the Jason-2 satellite, it was found that under the conditions of the observational area being within the scope of 66° from the equator, the height anomaly differences at the junction were less than 30 cm, and the absolute mean error of HY-2A and Jason-2 sea level height anomaly was 5.86 cm, with a standard deviation of 7.52 cm. It was observed that, if within the sea area the sea level height anomaly difference was limited to within 10 cm, then the absolute mean error and standard deviation could reach 4.19 cm and 4.98 cm, respectively. It was confirmed that the HY-2A satellite’s radar altimeter had successfully reached the height measurement level of similar international altimeters. Therefore, it had the ability to meet the needs of marine scientific research and ocean circulation inversions.
  • loading
  • Ablain M, Philipps S, Picot N, et al. 2010. Jason-2 global statistical assessment and cross-calibration with Jason-1. Marine Geodesy, 33(S1):162-185
    Arnault S, Pujol I, MéLice J L. 2011. In situ validation of Jason-1 and Jason-2 altimetry missions in the tropical Atlantic Ocean. Marine Geodesy, 34(3-4):319-339
    Bao Lifeng, Gao Peng, Peng Hailong, et al. 2015. First accuracy assessment of the HY-2A altimeter sea surface height observations:cross-calibration results. Advances in Space Research, 55(1):90-105, doi: 10.1016/j.asr.2014.09.034
    Chen Chuntao, Zhu Jianhua, Lin Mingsen, et al. 2013. The validation of the significant wave height product of HY-2 altimeter-primary results. Acta Oceanologica Sinica, 32(11):82-86, doi: 10.1007/s13131-013-0381-6
    Dorandeu J, Ablain M, Faugère Y, et al. 2004. Jason-1 global statistical evaluation and performance assessment:calibration and cross-calibration results. Marine Geodesy, 27(3-4):345-372
    Jiang Xingwei, Lin Mingsen. 2016. Ocean Observation from Haiyang Satellites. ACE Science Activities in China, 191-200
    Jiang Xingwei, Lin Mingsen, Liu Jianqiang, et al. 2012. The HY-2 satellite and its preliminary assessment. International Journal of Digital Earth, 5(3):266-281, doi: 10.1080/17538947.2012.658685
    Lillibridge J, Lin Mingsen, Shum C K. 2013. Hurricane Sandy storm surge measured by satellite altimetry. Oceanography, 26(2):8-9
    Lin Mingsen, Jiang Xingwei. 2014. HY-2 ocean dynamic environment mission and payloads. In:Proceedings of 2014 IEEE Geoscience and Remote Sensing Symposium (IGARSS). Quebec City, QC, Canada:IEEE, 2014:5167-5170
    Liu Qingxiang, Babanin A V, Guan Changlong, et al. 2016. Calibration and validation of HY-2 altimeter wave height. Journal of Atmospheric and Oceanic Technology, 33(5):919-936, doi: 10.1175/JTECH-D-15-0219.1
    Prandi P, Philipps S, Pignot V, et al. 2015. SARAL/AltiKa global statistical assessment and cross-calibration with Jason-2. Marine Geodesy, 38(S1):297-312
    Ye Xiaomin, Lin Mingsen, Xu Ying. 2015. Validation of Chinese HY-2 satellite radar altimeter significant wave height. Acta Oceanologica Sinica, 34(5):60-67, doi: 10.1007/s13131-015-0667-y
    Zhao Yili, Zhu Jianhua, Lin Mingsen, et al. 2014. Assessment of the initial sea surface temperature product of the scanning microwave radiometer aboard on HY-2 satellite. Acta Oceanologica Sinica, 33(1):109-113, doi: 10.1007/s13131-014-0402-0
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article views (420) PDF downloads(163) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return