Improved GNSS-R Ocean Surface Altimetry With CYGNSS in the Seas of Indonesia

被引:28
|
作者
Mashburn, Jake [1 ]
Axelrad, Penina [2 ]
Zuffada, Cinzia [3 ]
Loria, Eric [4 ]
O'Brien, Andrew [4 ]
Haines, Bruce [3 ]
机构
[1] Draper, Cambridge, MA 02139 USA
[2] Univ Colorado Boulder, Ann & HJ Smead Aerosp Engn Sci, Boulder, CO 80309 USA
[3] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA
[4] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA
来源
基金
美国国家航空航天局;
关键词
Delays; Altimetry; Sea surface; Receivers; Space vehicles; Radar tracking; CYGNSS; GNSS Reflectometry (GNSS-R); modeling; ELECTROMAGNETIC BIAS; INTERFEROMETRY; REFLECTIONS; PRECISION; SIGNALS;
D O I
10.1109/TGRS.2020.2973079
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Ocean surface altimetry with GNSS reflectometry (GNSS-R) has the potential to improve the observation and retrieval of mesoscale ocean current flows by increasing the spatial density of ocean surface observations. The leading challenges in current GNSS-R altimetry investigations include precise delay retracking, correction of ionospheric effects, and spacecraft receiver positioning. Here, we present improved methods to account for these challenges. A reflection-model-based approach is presented for delay retracking that uses simulated delay-Doppler maps (DDMs) to retrieve the specular delay from measured DDMs. Global ionosphere maps are used to estimate the group delay effect along the direct and reflection paths. Precise orbit determination techniques are used to improve estimates of the receiving spacecraft position and reduce systematic intersatellite biases. We analyze altimetric height retrievals from two cases, strongly coherent or diffuse reflections. We study the residual systematic error signals with a focus on understanding the errors identified above. The strong coherent observations have narrow, symmetric delay waveforms and provide higher than average signal-to-noise ratio. The DDMs of diffuse observations, originate from relatively rough ocean surfaces and have the characteristic horse-shoe shape. Only measurements from the ocean and seas surrounding Indonesia are considered as this area provides a significant number of strongly coherent reflections. More than 50 000 single-point observations and week-long averaged results are presented to quantify the noise and systematic characteristics of the retrieved surface heights.
引用
收藏
页码:6071 / 6087
页数:17
相关论文
共 50 条
  • [1] IMPROVED ORBIT DETERMINATION OF THE CYGNSS SATELLITES AND ITS APPLICATION TO GNSS-R OCEAN ALTIMETRY
    Conrad, Alex
    Axelrad, Penina
    Zuffada, Cinzia
    Haines, Bruce
    O'Brien, Andrew
    Loria, Eric
    [J]. IGARSS 2020 - 2020 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, 2020, : 5847 - 5850
  • [2] GNSS-R FROM THE SMAP AND CYGNSS MISSIONS: APPLICATION TO POLARIMETRIC SCATTEROMETRY AND OCEAN ALTIMETRY
    Carreno-Luengo, H.
    Lowe, S. T.
    Zuffada, C.
    Esterhuizen, S.
    Oveisgharan, S.
    [J]. 2017 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), 2017, : 5019 - 5021
  • [3] Assessment of Spaceborne GNSS-R Ocean Altimetry Performance Using CYGNSS Mission Raw Data
    Li, Weiqiang
    Cardellach, Estel
    Fabra, Fran
    Ribo, Serni
    Rius, Antonio
    [J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2020, 58 (01): : 238 - 250
  • [4] Precision Bounds in GNSS-R Ocean Altimetry
    Pascual, Daniel
    Camps, Adriano
    Martin, Francisco
    Park, Hyuk
    Alonso Arroyo, Alberto
    Onrubia, Raul
    [J]. IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING, 2014, 7 (05) : 1416 - 1423
  • [5] STUDY OF ACCURATE OCEAN-ALTIMETRY WITH GNSS-R
    Zhang, Yun
    Liu, Fengling
    Gu, Qiming
    Meng, Wanting
    Hong, Zhonghua
    Han, Yanling
    [J]. 2013 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), 2013, : 1410 - 1413
  • [6] Delay Tracking in Spaceborne GNSS-R Ocean Altimetry
    Park, Hyuk
    Valencia, Enric
    Camps, Adriano
    Rius, Antonio
    Ribo, Serni
    Martin-Neira, Manuel
    [J]. IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, 2013, 10 (01) : 57 - 61
  • [7] THE GNSS-R CYGNSS MISSION: AN UPDATE
    Ruf, Chris
    McKague, Darren
    Morris, Mary
    Posselt, Derek
    Moghaddam, Mahta
    [J]. 2019 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2019), 2019, : 5171 - 5172
  • [8] ADVANCES IN GNSS-R ALTIMETRY
    Martin-Neira, M.
    Kern, M.
    D'Addio, S.
    Hatton, J.
    Rius, A.
    Li, W.
    Ribo, S.
    Fabra, F.
    Cardellach, E.
    Wickert, J.
    Semmling, M.
    [J]. 2017 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), 2017, : 2702 - 2703
  • [9] Geolocation, Calibration and Surface Resolution of CYGNSS GNSS-R Land Observations
    Gleason, Scott
    O'Brien, Andrew
    Russel, Anthony
    Al-Khaldi, Mohammad M.
    Johnson, Joel T.
    [J]. REMOTE SENSING, 2020, 12 (08)
  • [10] COMPARISON OF GNSS-R PROCESSING TECHNIQUES FOR SPACEBORNE OCEAN ALTIMETRY.
    Martin Alemany, F.
    D'Addio, S.
    Camps, A.
    Martin-Neira, M.
    Park, H.
    Pascual, D.
    [J]. 2013 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), 2013, : 2939 - 2942