本文選題：綜合孔徑輻射計(jì) + 空間分辨率　； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：L波段的熱輻射對海表鹽度敏感，，但對應(yīng)波段的被動式輻射計(jì)在一定空間分辨率要求下需要相當(dāng)長的天線，通過采用綜合孔徑技術(shù)可以解決天線的問題。現(xiàn)有衛(wèi)星輻射計(jì)廣泛采用Y型天線陣列獲取二維空間分辨率，通過改變天線陣列形狀或陣列間距進(jìn)一步改進(jìn)輻射計(jì)性能時，研究發(fā)現(xiàn)Y型陣列的空間分辨率在不發(fā)生空間譜混疊時是最優(yōu)的。通過對二維信號采樣形式的推廣，分析發(fā)現(xiàn)任意均勻或非均勻的二維天線陣列中，Y型陣列都是最優(yōu)的。并且不增加天線陣元只改變陣元間距時，空間分辨率和靈敏度性能之間存在矛盾。因此，將超綜合孔徑輻射計(jì)和一維綜合孔徑輻射計(jì)相結(jié)合，本文中提出了二維超綜合孔徑方案，并討論其與鏡像綜合孔徑技術(shù)的可結(jié)合性。 二維超綜合孔徑輻射計(jì)對可視度函數(shù)分別進(jìn)行匹配濾波與干涉測量處理，但順軌與交軌方向的相位關(guān)系會發(fā)生相位混疊而導(dǎo)致無法提取亮溫信息。使用角度預(yù)處理型的匹配濾波可以解決此問題并實(shí)現(xiàn)二維的空間分辨，且與一維超綜合孔徑輻射計(jì)類似，此輻射計(jì)中不存在增加陣元間距時的不確定性矛盾。仿真結(jié)果證明，二維超綜合孔徑輻射計(jì)可以在取得高空間分辨率的同時，取得優(yōu)于傳統(tǒng)Y型陣列的靈敏度，實(shí)現(xiàn)高精度高分辨率的鹽度輻射計(jì)設(shè)計(jì)。
[Abstract]:The thermal radiation in L-band is sensitive to the salinity of sea surface, but the passive radiometer in corresponding band needs a long antenna under certain spatial resolution. The problem of antenna can be solved by using synthetic aperture technique. The existing satellite radiometers widely use Y-shaped antenna arrays to obtain two-dimensional spatial resolution. When the antenna array shape or array spacing is changed to further improve the radiometer performance, It is found that the spatial resolution of Y-type arrays is optimal when there is no spatial spectral aliasing. By extending the sampling form of two-dimensional signal, it is found that the Y type array is optimal in any uniform or non-uniform two-dimensional antenna array. Moreover, there is a contradiction between spatial resolution and sensitivity when the space between the array elements is changed without increasing the antenna elements. Therefore, by combining the ultra-synthetic aperture radiometer with the one-dimensional synthetic aperture radiometer, a two-dimensional super-synthetic aperture scheme is proposed, and the feasibility of combining it with the mirror synthetic aperture technique is discussed. The two dimensional super-synthetic aperture radiometer performs matching filtering and interferometric measurement on the visibility function, but the phase relationship between the orbit and the interorbit direction will occur phase aliasing, which makes it impossible to extract the bright temperature information. This problem can be solved and two-dimensional spatial resolution can be realized by using the matched filtering of angle preprocessing type, and it is similar to the one-dimensional super-synthetic aperture radiometer. There is no uncertainty contradiction in this radiometer when increasing the spacing of array elements. The simulation results show that the two-dimensional super-synthetic aperture radiometer can obtain high spatial resolution and achieve better sensitivity than the traditional Y array, and achieve the design of high-precision and high-resolution salinization radiometer.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P715.6

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