本文選題：被動(dòng)微波發(fā)射率　切入點(diǎn)：發(fā)射率極化差　出處：《遼寧工程技術(shù)大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：地表微波發(fā)射率定義為地表向外發(fā)射的微波熱輻射與同溫度的黑體地表向外發(fā)射的熱輻射的比率,是對(duì)地物微波輻射模型理解的關(guān)鍵,也是應(yīng)用微波數(shù)據(jù)進(jìn)行地球物理參數(shù)反演的基礎(chǔ)。本文在晴空條件下高級(jí)微波掃描輻射計(jì)(AMSR-E)瞬時(shí)發(fā)射率產(chǎn)品的基礎(chǔ)上,輔助MODIS (Moderate Resolution Imaging Spectroradiometer)的IGBP (International Geosphere-Biosphere Project labels)分類數(shù)據(jù)提取了不同地物覆蓋下半月平均的微波發(fā)射率。選取和微波發(fā)射率有內(nèi)在物理聯(lián)系的衛(wèi)星產(chǎn)品數(shù)據(jù)——AMSR-E的微波植被指數(shù)(MVIs)、光學(xué)MODIS (Moderate Resolution Imaging Spectroradiometer)的歸一化植被指數(shù)NDVI (Normalized Difference Vegetation Index)、AMSR-E的土壤水分,研究他們和微波發(fā)射率之間的內(nèi)在相關(guān)性。結(jié)果發(fā)現(xiàn)AMSR-E微波發(fā)射率和各衛(wèi)星產(chǎn)品間相關(guān)性較高,從而達(dá)到簡(jiǎn)單、快速檢驗(yàn)微波發(fā)射率的目的。在此基礎(chǔ)上結(jié)合地表覆蓋數(shù)據(jù),提取和分析不同植被覆蓋和戈壁沙漠的發(fā)射率隨頻率、極化、時(shí)間等變化的特性。結(jié)果表明,植被發(fā)射率在H和V極化均隨頻率的增加而增加,在有降雪的地區(qū)發(fā)射率隨頻率增加而迅速減小。植被區(qū)夏季發(fā)射率較高,89GHz的V極化發(fā)射率值大于0.944,且發(fā)射率時(shí)間序列上很穩(wěn)定,極化差較低(0.081),同一地區(qū)發(fā)射率時(shí)間序列RSME小于0.0072。植被區(qū)冬季在積雪出現(xiàn)的地方發(fā)射率值降低,尤其表現(xiàn)在高頻部分。隨著植被密度的增加,植被地區(qū)發(fā)射率值增加而極化差降低。戈壁沙漠區(qū)發(fā)射率極化差隨頻率的增加而減小,極化差較大(0.03-0.127)。H極化發(fā)射率隨頻率增加而增加,V極化發(fā)射率由于體散射的原因隨著頻率的增加而減小。37GHz發(fā)射率極化差和MODIS的NDVI有很好的負(fù)相關(guān)性。
[Abstract]:The microwave emissivity of the surface is defined as the ratio of the microwave thermal radiation emitted from the surface to the surface of the blackbody at the same temperature, which is the key to the understanding of the microwave radiation model of the ground object. This paper is based on the instantaneous emissivity of advanced microwave scanning radiometer AMSR-E under clear sky. MODIS moderate Resolution Imaging Spectroradioradiometers) Classification data of IGBP Geosphere-Biosphere Project labels extracted the average microwave emissivity under different ground cover. The selection of satellite product data with inherent physical relationship with microwave emissivity is the microwave vegetation index of AMSR-E. Soil moisture of MODIS moderate Resolution Imaging Spectroradiorometer, a normalized Difference Vegetation index, AMSR-E, is studied. The intrinsic correlation between them and microwave emissivity is studied. The results show that the microwave emissivity of AMSR-E is highly correlated with each satellite product, so that the microwave emissivity can be tested easily and quickly. On this basis, the surface cover data are combined. The characteristics of the emissivity of different vegetation cover and Gobi desert with frequency, polarization and time are analyzed. The results show that the vegetation emissivity increases with the increase of the frequency of H and V polarization. In the region with snowfall, the emissivity decreases rapidly with the increase of frequency. The V polarization emissivity is greater than 0.944 when the emissivity is higher than 89GHz in the vegetation area in summer, and the emissivity time series is very stable. The emissivity time series RSME of the same area is less than 0. 0072. The emissivity value of the vegetation region decreases in winter, especially in the high frequency region, with the increase of vegetation density. The emissivity polarization difference in Gobi desert decreases with the increase of frequency. The polarization emissivity increases with the increase of frequency. The polarization emissivity of V decreases with the increase of frequency and has a good negative correlation with the NDVI of MODIS.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P237

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本文編號(hào)：1651857