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Calibration of an airborne interferometric radar altimeter over the Qingdao coast Sea, China

Yang Lei, Xu Yongsheng, Zhou Xinghua, Zhu Lin, Jiang Qiufu, Sun Hanwei, Chen Ge, Wang Panlong, Mertikas Stylianos, Fu Yanguang, Tang Qiuhua, Yu Fangjie

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Extent20 pagesen
Extent5,22 megabytesen
TitleCalibration of an airborne interferometric radar altimeter over the Qingdao coast Sea, Chinaen
CreatorYang Leien
CreatorXu Yongshengen
CreatorZhou Xinghuaen
CreatorZhu Linen
CreatorJiang Qiufuen
CreatorSun Hanweien
CreatorChen Geen
CreatorWang Panlongen
CreatorMertikas Stylianosen
CreatorΜερτικας Στυλιανοςel
CreatorFu Yanguangen
CreatorTang Qiuhuaen
CreatorYu Fangjieen
Content SummaryCalibration/Validation (Cal/Val) of satellite altimeters is fundamental for monitoring onboard sensor performance and ensuring long-term data quality. As altimeter technology has been evolving rapidly from profile to wide swath and interferometric altimetry, different requirements regarding Cal/Val have emerged. Most current Cal/Val technology has been developed for conventional profile altimeters, whereby satellite observations are compared against measurements at one point along orbit lines. However, the application of this type of Cal/Val technique to swath interferometric altimeters with two-dimensional measurements is difficult. Here, we propose a new strategy for the evaluation of interferometric altimeters based on comparison of wave-induced sea surface elevation (WSSE) spectra from one- and two-dimensional measurements. This method assumes that the WSSE variance of an equilibrium wave field is uniform and can be measured equivalently in the space or time domains. The method was first tested with simulated data and then used to evaluate the performance of an airborne interferometric radar altimeter system (AIRAS) using Global Navigation Satellite System (GNSS) buoy measurements. The differences between the WSSE variances from the AIRAS and two GNSS buoys were below 8 cm2, corresponding to a standard deviation of 2.8 cm, which could serve as a reference for the WSSE error over the scale range of waves. The correlation coefficient between the AIRAS and GNSS buoys was approximately 0.90, indicating that the error was small relative to the WSSE signals. In addition, the sea surface height (SSH) difference measured by the AIRAS was compared with that derived from the GNSS buoys at two sites. The results indicated that the error of the SSH difference was 3 cm. This approach represents a possible technique for the Cal/Val of future spaceborne/airborne interferometric altimeters; however, additional experiments and applications are needed to verify the feasibility of this method.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Date of Item2021-08-03-
Date of Publication2020-
SubjectInterferometric altimeteren
SubjectGlobal Navigation Satellite System (GNSS) buoyen
SubjectPower spectrum densityen
Bibliographic CitationL. Yang, Y. Xu, X. Zhou, L. Zhu, Q. Jiang, H. Sun, G. Chen, P. Wang, S. P. Mertikas, Y. Fu, Q. Tang, and F. Yu, “Calibration of an airborne interferometric radar altimeter over the Qingdao coast Sea, China,” Remote Sens., vol. 12, no. 10, May 2020. doi: 10.3390/rs12101651en

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