| Shenzhou-4 spaceborne altimeter waveform processing and significant wave height retrieval |
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| 作者姓名： | JI Yonggang ZHANG Jie ZHANG Youguang MENG Junmin |
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| 作者单位： | JI Yonggang 1，2，3*，ZHANG Jie3，ZHANG Youguang4，MENG Junmin3 1. Institute of Oceanology，Chinese Academy of Sciences，Qingdao 266071，China 2. Graduate School of Chinese Academy of Sciences，Beijing 100039，China 3. First Institute of Oceanography，State Oceanic Administration，Qingdao 266061，China 4. National Satellite Ocean Application Service，Beijing 100081，China |
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| 摘 要： | 1IntroductionSZ-4spaceborne,launched on30December2002,is the fourth unmanned spaceborne of China.Multimode microwave remote sensor is its primaryload,of which the altimeter mode is the most impor-tant one.During about five months,a large numberofSZ-4altim…
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| 关 键 词： | 测高仪 波长 波形 海洋动力学 |
| 收稿时间： | 2006-01-13 |
| 修稿时间： | 2006-03-26 |
Shenzhou-4 spaceborne altimeter waveform processing and significant wave height retrieval |
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| JI Yonggang,ZHANG Jie,ZHANG Youguang,MENG Junmin.Shenzhou-4 spaceborne altimeter waveform processing and significant wave height retrieval[J].Acta Oceanologica Sinica,2006,25(3):40-47. |
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| Authors: | JI Yonggang ZHANG Jie ZHANG Youguang and MENG Junmin |
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| Institution: | 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China2.First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China3.National Satellite Ocean Application Service, Beijing 100081, China |
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| Abstract: | The Shenzhou-4 spaceborne (SZ-4) altimeter waveforms were processed, and then the significant wave heights (SWH) was retrieved on the basis of waveform fitting and waveform retracking. Waveforms processing includes the waveform 1s averaging, the elimination of thermal noise and the waveforms normalization. Double peaks were found on each SZ-4 waveform, and it was pointed out that the region of waveforms with the second peak is abnormal and its effects on the whole waveform in the waveform fit should be taken into consideration. To obtain the width of the waveform leading-edge, a method was proposed to find the starting point of waveform, and the half-power point of waveform was found by retracking the waveform. The normalized waveforms were fitted with the Haynes model by using the weighting least square fit method. Then the selections of the weighting coefficients and their effects on significant wave hight retrieving were discussed, and the optimal five-region weighting method was proposed. At last, the SWH data of SZ-4 altimeter retrieved by using the proposed method were compared with those of ERS-2 and Jason-1 altimeter, and it was concluded that the SZ-4 altimeter can detect significant wave height. |
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| Keywords: | SZ-4 spaceborne altimeter significant wave height double peaks waveform retracking waveform fit |
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