本文選題：雷達　切入點：SAR　出處：《中國海洋大學(xué)》2014年碩士論文

【摘要】：合成孔徑雷達SAR是一種主動式微波遙感傳感器，是一種能夠全天時、全天候地對地進行觀測的先進航天遙感手段。其優(yōu)勢在于全球覆蓋和高分辨率，在海洋觀測、環(huán)境監(jiān)測、災(zāi)害監(jiān)測等等領(lǐng)域，已經(jīng)成為對地觀測的一種主要手段。目前各種波段、不同極化組合以及不同工作模式的SAR種類繁多，其不同目標(biāo)的觀測精度也不盡相同。因此，要發(fā)展SAR海洋應(yīng)用技術(shù)，闡明SAR雷達參數(shù)及工作模式對目標(biāo)反演的影響至關(guān)重要。 本論文對星載SAR海浪仿真分析，對不同工作模式和參數(shù)建立的海浪仿真的模型進行了比對分析。對星載SAR數(shù)據(jù)海浪仿真技術(shù)和海浪信息提取技術(shù)進行研究，以最終獲得的圖像和數(shù)據(jù)結(jié)果來分析不同參數(shù)和工作模式對海浪反演的影響，并針對海浪反演的最佳工作方式進行研究。 結(jié)合海浪反演技術(shù)的研究，給出海浪反演的最佳成像模式、在軌使用方式、入射角、分辨率、測繪帶寬、輻射精度等方面的建議。通過對SAR仿真圖像進行反演，得出各種工作方式和參數(shù)對海浪反演的影響如下： a.入射角20o和30o最適合反演，40o和50o也在適應(yīng)范圍內(nèi)，，小入射角和大入射角會帶來較大誤差。 b.空間分辨率對海浪反演并不是越高越好，空間分辨率為3米時，反演結(jié)果并不是最好的，而空間分辨率為25米時的反演結(jié)果已經(jīng)較為理想。 c.對高精度要求的波浪觀測，極化方式使用雙極化或全極化。由各波段VV和HH極化電磁波后向散射截面隨風(fēng)速的變化可見，VV極化波對風(fēng)速的響應(yīng)更加明顯。因此，如果對風(fēng)速的觀測精度要求比較高，則應(yīng)該優(yōu)選VV極化。 d.輻射精度對波浪反演的影響主要體現(xiàn)在波高的反演上面，從對仿真數(shù)據(jù)的處理分析上看，要保證波高的反演誤差在20%以內(nèi)，誤差應(yīng)該控制在2dB以內(nèi)。
[Abstract]:Synthetic Aperture Radar (SAR) is an active microwave remote sensing sensor. It is an advanced space remote sensing method which can be observed all day, all weather, and surface to ground.Its advantage lies in its global coverage and high resolution. It has become a major means of Earth observation in the fields of ocean observation, environmental monitoring, disaster monitoring and so on.At present, there are many kinds of SAR with different bands, different polarization combinations and different working modes, and the observation accuracy of different targets is different.Therefore, in order to develop SAR ocean application technology, it is very important to clarify the influence of SAR radar parameters and working model on target inversion.The wave simulation technology and wave information extraction technology of spaceborne SAR data are studied. The effects of different parameters and working patterns on ocean wave inversion are analyzed with the obtained images and data results.And the best working way of wave inversion is studied.Based on the research of ocean wave inversion technology, the best imaging model, the mode of in-orbit use, the incident angle, the resolution, the mapping bandwidth and the radiating accuracy of the wave inversion are given.By inversion of SAR simulation images, the effects of various working modes and parameters on ocean wave inversion are obtained as follows:a.The 20 o and 30 o incident angles are most suitable for the inversion of 40 o and 50 o in the adaptive range, and the small and large incident angles will lead to large errors.b.When the spatial resolution is 3 meters, the inversion result is not the best, and the inversion result when the spatial resolution is 25 meters is better.c.For wave observations with high accuracy, the polarization mode is dual or fully polarized.The change of backscattering cross section of VV and HH polarization electromagnetic waves with wind speed shows that the response of VV polarization wave to wind speed is more obvious.Therefore, VV polarization should be chosen if the accuracy of wind speed is high.d.The effect of radiation accuracy on wave inversion is mainly reflected in the inversion of wave height. From the analysis of simulation data, the inversion error of wave height should be controlled within 2dB to ensure that the inversion error of wave height is less than 20%.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P731.22;P714.1

【參考文獻】

相關(guān)期刊論文 前3條

1 江東,王建華;空間信息技術(shù)支持下的沿海風(fēng)能資源評價[J];地理科學(xué)進展;2004年06期

2 賈富倉,李華;一種基于三階中心矩的圖像邊緣檢測方法[J];計算機工程與應(yīng)用;2004年09期

3 匡綱要，粟毅，彭長青，陸仲良;基于高階矩的改進Prony技術(shù)的雷達目標(biāo)沖擊響應(yīng)極點提取[J];系統(tǒng)工程與電子技術(shù);1995年10期

本文編號：1721074