發(fā)布時(shí)間：2017-12-31 14:07

  本文關(guān)鍵詞：星上比輻射定標(biāo)器及性能評(píng)估方法研究　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輻射定標(biāo) 比值輻射計(jì) 漫射板 性能評(píng)估 不確定度

【摘要】：高精度的星上定標(biāo)是實(shí)現(xiàn)遙感數(shù)據(jù)定量化的重要途徑之一。以太陽(yáng)照明反射特性已知的聚四氟乙烯漫射板作為光源,采用比值輻射計(jì)進(jìn)行漫反射板響應(yīng)率衰減的監(jiān)測(cè)和修正,實(shí)現(xiàn)對(duì)遙感器全光路、全視場(chǎng)、全口徑的高精度絕對(duì)輻射定標(biāo),是當(dāng)前可見(jiàn)短波紅外波段星上定標(biāo)技術(shù)的主要發(fā)展趨勢(shì)。星上比輻射定標(biāo)器性能評(píng)估準(zhǔn)確與否直接影響其在軌應(yīng)用性能。在此背景下,本論文開(kāi)展了星上比輻射定標(biāo)器及其性能評(píng)估方法研究。論文介紹了星上比輻射定標(biāo)器工作原理,詳細(xì)闡述了各關(guān)鍵環(huán)節(jié)設(shè)計(jì)方案。根據(jù)定標(biāo)器原理和物理模型,分析得出星上定標(biāo)不確定度主要來(lái)源為漫射板BRDF實(shí)時(shí)量值的不確定度,其關(guān)鍵在于比值輻射計(jì)對(duì)漫射板在軌衰減的修正精度。對(duì)星上比輻射定標(biāo)器性能參數(shù)測(cè)試需求進(jìn)行了分析,識(shí)別出太陽(yáng)觀測(cè)幾何因子波段比、輻射比、動(dòng)態(tài)范圍和信噪比等比值輻射計(jì)的關(guān)鍵表征參數(shù)。建立了定標(biāo)器測(cè)試方案和流程,并在實(shí)驗(yàn)室內(nèi)完成了比值輻射計(jì)、漫反射板以及星上比輻射定標(biāo)器整機(jī)級(jí)的性能參數(shù)測(cè)試。以鹵鎢燈作為測(cè)試光源,獲取了比值輻射計(jì)太陽(yáng)觀測(cè)幾何因子波段比查找表,不確定度優(yōu)于0.18%;通過(guò)燈-板模擬系統(tǒng)完成了輻射比驗(yàn)證,預(yù)估在軌輻射比測(cè)量不確定度優(yōu)于0.4%;使用已標(biāo)定的大口徑、多能級(jí)積分球光源對(duì)比值輻射計(jì)的動(dòng)態(tài)范圍、信噪比和穩(wěn)定性進(jìn)行了測(cè)試。結(jié)合漫射板和定標(biāo)器整機(jī)測(cè)試結(jié)果,比值輻射計(jì)對(duì)漫反射板穩(wěn)定性監(jiān)視不確定度優(yōu)于1.3%,漫射板BRDF實(shí)時(shí)量值不確定度優(yōu)于1.76%,星上比輻射定標(biāo)器的絕對(duì)輻射定標(biāo)總不確定度優(yōu)于3%。本論文系統(tǒng)性地對(duì)星上比輻射定標(biāo)器性能評(píng)估方法進(jìn)行了研究,提出了定標(biāo)器測(cè)試方法以及測(cè)試流程,通過(guò)對(duì)星上比輻射定標(biāo)器部件級(jí)以及整機(jī)級(jí)參數(shù)的測(cè)試,獲取了定標(biāo)器各項(xiàng)定標(biāo)參數(shù),完成星上定標(biāo)不確定度的評(píng)估,驗(yàn)證了星上定標(biāo)器設(shè)計(jì)以及性能評(píng)估方法的合理性,可以為定標(biāo)器在軌應(yīng)用以及定標(biāo)精度預(yù)評(píng)估提供有效數(shù)據(jù)支撐。
[Abstract]:High-precision on-board calibration is one of the important ways to realize the quantification of remote sensing data. The PTFE diffuse plate which has known solar illumination reflection characteristics is used as the light source. The ratio radiometer is used to monitor and modify the response rate attenuation of the diffuse reflector to achieve the high-precision absolute radiometric calibration of the remote sensor in all optical path, all field of view and all caliber. It is the main development trend of on-board calibration technology in visible and short-wave infrared band at present. The performance evaluation of on-board specific radiation calibrator has a direct impact on the performance of on-orbit applications. In this paper, the on-board specific radiation calibrator and its performance evaluation method are studied, and the working principle of onboard specific radiation calibrator is introduced. According to the principle of the scaler and the physical model, it is concluded that the main source of the onboard calibration uncertainty is the uncertainty of the BRDF real time value of the diffuse plate. The key point lies in the correction accuracy of the ratio radiometer to the attenuation of the diffuse plate in orbit. The requirements of the performance parameters of the onboard specific radiation calibrator are analyzed and the spectral band ratio and the radiation ratio of the geometrical factors observed by the sun are identified. The dynamic range and signal-to-noise ratio (SNR) are the key parameters of the radiometer. The testing scheme and flow chart of the calibrator are established, and the ratio radiometer is completed in the laboratory. The performance parameters of diffuse reflector and onboard specific radiation calibrator are tested. The ratio radiometer solar observation geometric factor band ratio look-up table is obtained with halogen tungsten lamp as the light source. Uncertainty is better than 0.18; The radiation ratio is verified by the lamp-plate simulation system, and the uncertainty of the measurement of the estimated in-orbit radiation ratio is better than 0.4. The dynamic range, signal-to-noise ratio (SNR) and stability of the calibrated large aperture, multi-level integrated sphere light source are measured. The uncertainty of the ratio radiometer for the stability monitoring of the diffuse reflector is better than 1.3 and the uncertainty of the real-time BRDF value of the diffuse plate is better than 1.76%. The total uncertainty of onboard specific radiation calibrator is better than 3. In this paper, the performance evaluation method of onboard specific radiation calibrator is systematically studied, and the testing method and flow chart are put forward. By testing the component level and the whole machine level parameters of onboard specific radiation calibrator, the calibration parameters are obtained, and the uncertainty of onboard calibration is evaluated. The rationality of the on-board scaler design and performance evaluation method is verified, which can provide effective data support for the application of the calibrator in orbit and the pre-evaluation of calibration accuracy.
【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP73

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