本文關(guān)鍵詞： 高分辨率寬測(cè)繪帶 合成孔徑雷達(dá) Deramp 空時(shí)自適應(yīng)處理方法 動(dòng)態(tài)導(dǎo)向矢量　出處：《西安電子科技大學(xué)學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：在高分辨率寬測(cè)繪帶合成孔徑雷達(dá)系統(tǒng)中,用傳統(tǒng)的靜止場(chǎng)景成像方法對(duì)存在動(dòng)目標(biāo)的回波數(shù)據(jù)進(jìn)行成像,動(dòng)目標(biāo)在得到的合成孔徑雷達(dá)圖像中是散焦的,并且動(dòng)目標(biāo)會(huì)聚焦到錯(cuò)誤的位置,同時(shí),散焦的動(dòng)目標(biāo)會(huì)掩蓋原本的合成孔徑雷達(dá)場(chǎng)景.利用傳統(tǒng)的空時(shí)自適應(yīng)處理方法對(duì)合成孔徑雷達(dá)圖像中散焦的動(dòng)目標(biāo)進(jìn)行抑制時(shí),所需的空間自由度為場(chǎng)景中動(dòng)目標(biāo)的個(gè)數(shù)與脈沖重復(fù)頻率欠采樣數(shù)的乘積,這在實(shí)際中很難得到滿足.為解決這一問題,提出了一種基于方位Deramp處理的空時(shí)自適應(yīng)處理方法.該方法首先對(duì)合成孔徑雷達(dá)回波數(shù)據(jù)進(jìn)行方位Deramp處理,使得動(dòng)目標(biāo)在空時(shí)平面中是粗聚焦的,此時(shí),抑制合成孔徑雷達(dá)圖像中的一個(gè)動(dòng)目標(biāo)只需要一個(gè)空間自由度.當(dāng)合成孔徑雷達(dá)圖像中存在多個(gè)動(dòng)目標(biāo)時(shí),提出了動(dòng)態(tài)導(dǎo)向矢量的概念,它能有效地減少抑制合成孔徑雷達(dá)圖像中散焦動(dòng)目標(biāo)所需的空間自由度數(shù)目.
[Abstract]:In the high-resolution wide-band synthetic aperture radar (SAR) system, the traditional still scene imaging method is used to image the echo data with moving target, which is defocused in the obtained SAR image. And moving the target will focus in the wrong place, at the same time. The defocused moving target will cover up the original SAR scene. The traditional space-time adaptive processing method is used to suppress the defocused moving target in the SAR image. The required spatial degree of freedom is the product of the number of moving targets in the scene and the under-sampling number of pulse repetition frequency, which is difficult to satisfy in practice. An adaptive space-time processing method based on azimuth Deramp processing is proposed. Firstly, azimuth Deramp processing is applied to SAR echo data. The moving target is coarsely focused in the space-time plane. In this case, only one spatial degree of freedom is needed to suppress a moving target in the SAR image. When there are multiple moving targets in the SAR image. The concept of dynamic steering vector is proposed, which can effectively reduce the number of spatial degrees of freedom required to suppress defocusing targets in synthetic aperture radar (SAR) images.
【作者單位】： 西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室;西安電子科技大學(xué)信息感知技術(shù)協(xié)同創(chuàng)新中心;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61301292) 空間測(cè)控通信創(chuàng)新探索基金資助項(xiàng)目(201509A)
【分類號(hào)】：TN957.52
【正文快照】： 分辨率和測(cè)繪帶寬是衡量合成孔徑雷達(dá)(Synthetic Aperture Radar,SAR)系統(tǒng)性能優(yōu)劣的兩個(gè)重要指標(biāo).受傳統(tǒng)的單通道合成孔徑雷達(dá)存在最小天線面積的限制,兩者往往不可兼得[1].為解決這一矛盾,高分辨率寬測(cè)繪帶(High-Resolution Wide-Swath,HRWS)合成孔徑雷達(dá)成像模式被提出[2-3

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 邢孟道;孫光才;李學(xué)仕;;用于高分辨率寬測(cè)繪帶SAR系統(tǒng)的SAR/GMTI處理方法研究[J];雷達(dá)學(xué)報(bào);2015年04期

2 王s，

本文編號(hào)：1464236