Compensating the PTR and LPF Features of the HY-2A Satellite Altimeter Utilizing Look-Up Tables

被引：10

作者：

Xu, Xi-Yu ^{[1
]}

Xu, Ke ^{[1
]}

Wang, Zhen-Zhan ^{[1
]}

Liu, He-Guang ^{[1
]}

Wang, Lei ^{[2
,3
]}

机构：

[1] Chinese Acad Sci, Natl Space Sci Ctr, CAS Key Lab Microwave Remote Sensing MiRSLab, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Natl Space Sci Ctr, MiRSLab, Beijing 100190, Peoples R China

[3] Univ CAS, Beijing, Peoples R China

来源：

IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING | 2015年 / 8卷 / 01期

关键词：

Low-pass filter (LPF); maximum likelihood estimation; measurement errors; Monte Carlo methods; radar altimetry; SIGNIFICANT WAVE HEIGHT; RADAR ALTIMETER; SURFACE; ATTITUDE; RETRACKING; FORMS;

D O I：

10.1109/JSTARS.2014.2364026

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The point target response (PTR) and low-pass filter (LPF) features of the altimeter (ALT) onboard China's HY-2A satellite are presented and analyzed. Via Monte-Carlo simulation, the look-up tables (LUTs) of the range (epoch), significant wave height (SWH), and backscatter (Sigma0) biases with respect to SWH and attitude angle (ATT) are calculated accounting for the instrument PTR and LPF features using two distinct retracking algorithms (MLE3 and MLE4). The performance of both retracking algorithms are also evaluated in terms of the size of the biases (corrections) produced, and MLE4 is found better. The actual PTR and the Bessel-expression flat surface impulse response (FSIR) are integrated in the simulation procedure to achieve more accurate results. The simulated biases are tabulated by very fine grids of SWH and ATT so that they can be used as corrections in the ground preprocessing procedure (processing prior to Level 2 product) to get better operational ocean products. As verified by the crossover analysis with the Jason-2 ALT, the corrections pertaining to the instrument features significantly improve the accuracy of HY-2A ALT sea level products.

引用

页码：149 / 159

页数：11

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