SAR分布目標(biāo)多視圖像分辨特性研究

王巖飛; 劉中梅

doi:10.11999/JETI170118

SAR分布目標(biāo)多視圖像分辨特性研究

doi: 10.11999/JETI170118

王巖飛¹,
劉中梅²

1.
(中國科學(xué)院電子學(xué)研究所北京 100190) ②(中國科學(xué)院大學(xué) 北京 100049)

基金項(xiàng)目:

國家自然科學(xué)基金(61471340)

計(jì)量
- 文章訪問數(shù): 1411
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-02-15
- 修回日期: 2017-04-20
- 刊出日期: 2017-10-19

Study on Distributed Targets Resolution of Multilook SAR Image

WANG Yanfei¹,
LIU Zhongmei²

1.
(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)

Funds:

The National Natural Science Foundation of China (61471340)

摘要

摘要: 該文提出了結(jié)合目標(biāo)特性與圖像多視數(shù)對SAR分辨特性進(jìn)行分析和評定的方法?；趯AR目標(biāo)可分辨概率的研究，以及對SAR復(fù)散射回波信號特性的分析，得到了目標(biāo)之間關(guān)于信號幅度比、相位差和多視數(shù)的聯(lián)合概率密度函數(shù)，建立了SAR分布目標(biāo)可分辨特性與目標(biāo)統(tǒng)計(jì)特性以及圖像多視數(shù)之間的數(shù)學(xué)關(guān)系模型。結(jié)合目標(biāo)可區(qū)分條件，探討分析了目標(biāo)統(tǒng)計(jì)特性和多視處理對SAR系統(tǒng)分辨特性的影響。從該文的研究分析可以看出，由于分布目標(biāo)信號具有的隨機(jī)特性，在目標(biāo)間距離小于傳統(tǒng)的分辨率時(shí)也存在可分辨性，目標(biāo)間距離大于系統(tǒng)分辨率時(shí)也存在不可分辨性。多視處理相當(dāng)于增加了目標(biāo)間的相關(guān)性，同樣對SAR的分辨特性有較大的影響。該文提出的分辨特性評價(jià)指標(biāo)將SAR系統(tǒng)特性與目標(biāo)特性相結(jié)合，更能真實(shí)反映SAR的分辨性能，對SAR系統(tǒng)參數(shù)設(shè)計(jì)和評定有重要意義。
- SAR /
- 分布目標(biāo) /
- 可分辨概率 /
- 統(tǒng)計(jì)特性 /
- 多視處理
Abstract: A method is proposed to analyze and assess the SAR resolution, which considers the statistical characteristics of the distributed targets and the number of multi-look. The joint probability density function of two points on the amplitude radio, phase difference, correlation coefficient, and the number of multi-look is deduced from the SAR complex scattering echo signal. Based on the study of the SAR separable probability and the PDF, a mathematical model is built that reflects the mathematical relationship between the SAR resolution and the statistical properties of the targets and the number of multi-look. Considering the condition that the points can be separated, the influence that the statistical properties of SAR distributed targets and multi-look processing have on SAR resolution is discussed. From the numerical results, when the distance between targets is less than the traditional resolution, the targets also can be distinguished; and when the distance is larger than the traditional resolution, the targets may not be distinguished. The effect of multi-look processing is equivalent to increasing the relevance between the targets, and it also has great influence on SAR resolution. The separable probability can reflect the resolution performance correctly and is important for designing and evaluating the SAR system.
- SAR /
- Distributed targets /
- Resolution characteristics /
- Statistical properties /
- Multi-look processing

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