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  本文選題：合成孔徑雷達(SAR) + 地面運動目標檢測(GMTI)��； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：地面運動目標檢測(GMTI)技術是星載合成孔徑雷達研究中一個重要的研究內(nèi)容。為了實現(xiàn)地面運動目標檢測,星載SAR-GMTI系統(tǒng)需要工作在下視狀態(tài),這種情況下雷達系統(tǒng)會接收到來自地面的回波信號,包括地面靜止雜波信號和運動目標信號。星載平臺的運動速度很快,這會導致雜波的頻譜展寬,并且地面上靜止雜波的能量比運動目標的能量要強很多,在這種情況下直接進行運動目標檢測,檢測概率將會很低。所以為了提高目標檢測概率,星載合成孔徑雷達系統(tǒng)必須具備很強的雜波抑制能力,這也是實現(xiàn)GMTI功能的前提條件。本文主要對GMTI性能指標、TOPSAR成像和星載三通道SAR-GMTI自適應雜波抑制等幾個方面做了研究,主要工作概括如下:(1)首先從GMTI相關的指標出發(fā),介紹了虛警概率和檢測概率以及最小可檢測速度;接著介紹了在雜波非均勻的背景下星載SAR-GMTI對雜波環(huán)境的要求;最后介紹了相干性對GMTI性能的影響,其中主要研究了相干系數(shù)和雜波抑制性能的關系、垂直基線引起的去相干對GMTI的影響。(2)首先對TOPSAR的工作原理進行了分析,分別對工作模式和信號模型進行了分析;然后對TOPSAR成像算法進行了研究,采用了一種新的變標方式-BAS算法,仿真結(jié)果和對實測數(shù)據(jù)的處理結(jié)果均驗證了該方法的有效性。(3)研究了星載三通道SAR-GMTI自適應雜波抑制方法,首先對多孔徑技術進行了介紹,詳細介紹了多孔徑的概念和多孔徑SAR-GMTI處理方法,然后對基于自適應雜波抑制的多通道SAR-GMTI方法進行了改進,提出了一種星載三通道SAR-GMTI自適應雜波抑制方法,此方法考慮了相鄰多普勒單元的相關性,仿真結(jié)果驗證了該方法的有效性。
[Abstract]:Ground moving target detection (GMTI) is an important research content in spaceborne synthetic aperture radar (SAR). In order to realize ground moving target detection, spaceborne SAR-GMTI system needs to work in a down-looking state. In this case, radar system will receive echo signals from the ground, including ground static clutter signal and moving target signal. The moving speed of the spaceborne platform is very fast, which will result in the broadening of the clutter spectrum, and the energy of the stationary clutter on the ground is much stronger than that of the moving target. In this case, the detection probability will be very low if the moving target is detected directly. Therefore, in order to improve the probability of target detection, spaceborne synthetic Aperture Radar (SAR) system must have a strong clutter suppression ability, which is also a prerequisite for the realization of GMTI function. In this paper, the performance index of GMTI / TopSAR imaging and the adaptive clutter suppression of spaceborne three-channel SAR-GMTI are studied. The main work is summarized as follows: (1) starting from the index of GMTI, The false alarm probability, detection probability and minimum detectable speed are introduced, then the requirements of spaceborne SAR-GMTI for clutter environment under the background of heterogeneous clutter are introduced. Finally, the effect of coherence on the performance of GMTI is introduced. The relationship between coherence coefficient and clutter suppression performance is mainly studied. The effect of deconcentration caused by vertical baseline on GMTI is analyzed. Firstly, the working principle of TOPSAR is analyzed, and the operation mode and signal model are analyzed respectively. Then, the TOPSAR imaging algorithm is studied, and a new scale-varying BAS algorithm is adopted. The simulation results and the processing results of the measured data verify the effectiveness of the method. (3) the adaptive clutter suppression method for spaceborne three-channel SAR-GMTI is studied. The concept of multi-aperture and the processing method of multi-aperture SAR-GMTI are introduced in detail, and then the multi-channel SAR-GMTI method based on adaptive clutter suppression is improved. A novel adaptive clutter suppression method for spaceborne three-channel SAR-GMTI is proposed. The correlation of adjacent Doppler units is considered in this method. The simulation results show that the proposed method is effective.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN957.51

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本文編號：1900802