發(fā)布時間：2018-06-14 07:56

  本文選題：衛(wèi)星遙感器 + 輻射定標(biāo)�。� 參考：《中國科學(xué)技術(shù)大學(xué)》2017年博士論文

【摘要】：輻射定標(biāo)是遙感信息定量化的前提和基礎(chǔ),其定標(biāo)精度直接決定了定量遙感產(chǎn)品的質(zhì)量。目前,我國衛(wèi)星遙感器每年一次的業(yè)務(wù)化定標(biāo)頻次已不能滿足遙感定量化應(yīng)用的需求,高頻次高精度的在軌絕對輻射定標(biāo)已成為我國衛(wèi)星遙感器迫切需要解決的問題。本文在調(diào)研了國內(nèi)外各種在軌輻射定標(biāo)方法的基礎(chǔ)上,提出了一種基于全球定標(biāo)場網(wǎng)的在軌絕對輻射定標(biāo)方法,通過建立全球定標(biāo)場網(wǎng),增加衛(wèi)星過頂次數(shù),提高在軌輻射定標(biāo)頻次。論文介紹了全球定標(biāo)場網(wǎng)定標(biāo)方法的總體方案和基本流程。根據(jù)傳統(tǒng)場地替代定標(biāo)對輻射定標(biāo)場地要求,以及全球定標(biāo)場網(wǎng)的應(yīng)用需求,提出了全球定標(biāo)場網(wǎng)輻射定標(biāo)場的篩選準(zhǔn)則。通過調(diào)研全球已使用的定標(biāo)場和自動化搜索定標(biāo)場,收集了覆蓋全球范圍的131個定標(biāo)場,構(gòu)建了全球定標(biāo)場網(wǎng)。同時對定標(biāo)場的空間均勻性、時間穩(wěn)定性、光譜形狀、地表方向性和大氣特性進行了分析。在構(gòu)建全球定標(biāo)場網(wǎng)的基礎(chǔ)上,建立全球定標(biāo)場網(wǎng)數(shù)據(jù)庫,用于存儲各定標(biāo)場在軌絕對輻射定標(biāo)所需的地表和大氣參數(shù)。調(diào)研并篩選國內(nèi)外可用的空基和地基業(yè)務(wù)化觀測產(chǎn)品,為基于全球定標(biāo)場網(wǎng)數(shù)據(jù)庫提供定標(biāo)基礎(chǔ)數(shù)據(jù),并根據(jù)各數(shù)據(jù)產(chǎn)品的特點,設(shè)計了相關(guān)數(shù)據(jù)存儲表。為了確保全球定標(biāo)場網(wǎng)數(shù)據(jù)庫基礎(chǔ)數(shù)據(jù)的準(zhǔn)確性,本文用敦煌場的現(xiàn)場實測反射率數(shù)據(jù)對全球定標(biāo)場網(wǎng)數(shù)據(jù)庫反射率數(shù)據(jù)進行了驗證,在MODIS前六個通道相對偏差不超過±3.1%。本文設(shè)計了全球定標(biāo)場網(wǎng)輻射定標(biāo)軟件,用于實現(xiàn)全球定標(biāo)場網(wǎng)數(shù)據(jù)庫的管理和衛(wèi)星遙感器的在軌絕對輻射定標(biāo)。使用全球定標(biāo)場網(wǎng)定標(biāo)方法對衛(wèi)星遙感器GF-1 WFV4和FY-3B VIRR分別進行了長時間序列定標(biāo),得到了 2013～2016年間的時間序列定標(biāo)系數(shù)。其中GF-1WFV4的定標(biāo)系數(shù)呈現(xiàn)出波動性;FY-3BVIRR則是單調(diào)衰變,對其絕對輻射定標(biāo)系數(shù)進行線性擬合,得到了 FY-3BVIRR定標(biāo)系數(shù)的日更新模型。使用傳統(tǒng)的場地替代定標(biāo)方法對GF-1 WFV4進行了在軌定標(biāo),與全球定標(biāo)場網(wǎng)定標(biāo)方法的結(jié)果進行比較,兩種方法得到的絕對輻射定標(biāo)系數(shù)的相對偏差小于2%,證明了全球定標(biāo)場網(wǎng)方法的可行性和準(zhǔn)確性。將全球定標(biāo)場網(wǎng)定標(biāo)方法的定標(biāo)結(jié)果分別與官方定標(biāo)結(jié)果進行比較,二者定標(biāo)結(jié)果的平均相對偏差均在±5.15%以內(nèi),證明了全球定標(biāo)場網(wǎng)定標(biāo)方法具有較好的可靠性和穩(wěn)定性。同時以GF-1 WFV4為例,分析了地表和大氣參數(shù)對輻射定標(biāo)的結(jié)果的影響。全球定標(biāo)場網(wǎng)方法利用其短期內(nèi)的高頻次定標(biāo)的優(yōu)勢,可用消除單次定標(biāo)結(jié)果的偶然性,提高定標(biāo)結(jié)果的可靠性和穩(wěn)定性;同時利用其長時間序列的定標(biāo)結(jié)果可以實現(xiàn)衛(wèi)星遙感器的在軌輻射特性連續(xù)監(jiān)測和動態(tài)跟蹤,及時校正衛(wèi)星遙感器的性能衰變。全球定標(biāo)場網(wǎng)定標(biāo)方法在保證定標(biāo)精度的前提下顯著提高定標(biāo)頻次,降低定標(biāo)成本,提高定標(biāo)時效性,為高精度的定量化遙感應(yīng)用奠定了基礎(chǔ),具有重要的應(yīng)用價值。
[Abstract]:Radiometric calibration is the precondition and foundation of remote sensing information quantification, and its calibration precision directly determines the quality of quantitative remote sensing products. At present, the frequency of the yearly calibration of satellite remote sensors in our country can not meet the needs of the remote sensing application, and the high frequency and high accuracy in orbit absolute radiation calibration has become a satellite remote sensor in our country. In this paper, based on the investigation of all kinds of on orbit radiation calibration methods at home and abroad, this paper presents an on orbit absolute radiation calibration method based on the global calibration field network. By establishing the global calibration field network, increasing the number of satellite over top number and increasing the frequency of the radiation calibration on orbit. The overall scheme and basic process of the method. According to the requirements for the radiometric calibration site and the application requirements of the global calibration field network, the selection criteria for the global calibration field network radiation calibration field are proposed. Through the investigation of the global calibration field and the automated search calibration field, 131 sets of global coverage are collected. The global calibration field network is constructed. At the same time, the spatial uniformity, time stability, spectral shape, surface orientation and atmospheric characteristics of the calibration field are analyzed. Based on the construction of the global calibration field network, a global calibration field network database is set up to store the surface and atmospheric parameters required for the absolute radiation calibration of the calibration fields. In order to ensure the accuracy of the basic data of the global calibration field network database, this paper uses the field measurement in Dunhuang field to ensure the accuracy of the basic data of the global calibration field network database. The reflectivity data of the global calibration field network database is verified. The relative deviation of the six channels in the first six channels is not more than + 3.1%.. The global calibration field network radiation calibration software is designed to realize the management of the global calibration field network database and the absolute radiation calibration of the satellite remote sensor. The global calibration field network is used. The standard method is used to calibrate the long time series of satellite remote sensor GF-1 WFV4 and FY-3B VIRR respectively, and the time series calibration coefficient of 2013~2016 years is obtained. The calibration coefficient of GF-1WFV4 is fluctuant; FY-3BVIRR is a monotonous decay, and its absolute radiation calibration coefficient is linear fitting, and the FY-3BVIRR calibration coefficient is obtained. GF-1 WFV4 is calibrated by traditional site replacement calibration method and compared with the result of global calibration field network calibration method. The relative deviation of the absolute radiometric calibration coefficient obtained by the two methods is less than 2%, which proves the feasibility and accuracy of the global calibration field network method. The calibration results of the standard method are compared with the official calibration results respectively. The average relative deviation of the two calibration results is less than 5.15%. It is proved that the global calibration field network calibration method has better reliability and stability. At the same time, the influence of the surface and atmospheric parameters on the results of radiation calibration is analyzed with GF-1 WFV4. Using the advantage of high frequency sub calibration in the short term, the standard field network can improve the reliability and stability of the calibration result by eliminating the contingency of the single calibration result and improving the reliability and stability of the calibration result. At the same time, the continuous monitoring and dynamic tracking of the satellite remote sensor can be realized by the calibration result of the long time series, and the satellite remote sensor can be corrected in time. The calibration method of global calibration field network can greatly improve the frequency of calibration, reduce the cost of calibration, improve the timeliness of calibration, and lay the foundation for high precision quantitative remote sensing application, which has important application value.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TP73

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