Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China

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	Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China
	Xu YS(徐永生)
刊名	Remote sensing
	2020
卷号	12
英文摘要	Calibration/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 profifile to wide swath and interferometric altimetry, different requirements regarding Cal/Val have emerged. Most current Cal/Val technology has been developed for conventional profifile 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 diffificult. 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 fifield is uniform and can be measured equivalently in the space or time domains. The method was fifirst 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 coeffificient 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.
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/170559]
专题	中国科学院海洋研究所
作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Xu YS. Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China[J]. Remote sensing,2020,12.
APA	Xu YS.(2020).Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China.Remote sensing,12.
MLA	Xu YS."Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China".Remote sensing 12(2020).