一種新的基于瞬時(shí)干涉的SAR-GMTI精聚焦和定位方法

張升; 孫光; 李學(xué)仕; 邢孟道

doi:10.11999/JEIT141245

一種新的基于瞬時(shí)干涉的SAR-GMTI精聚焦和定位方法

doi: 10.11999/JEIT141245

基金項(xiàng)目:

國(guó)家自然科學(xué)基金優(yōu)秀青年基金(61222108)，國(guó)家自然科學(xué)青年基金(61301292)和中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)(K5051302058)

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出版歷程
- 收稿日期: 2014-09-23
- 修回日期: 2015-01-15
- 刊出日期: 2015-07-19

Multi-channel Synthetic Aperture Radar-Ground Moving Target Indication High-accuracy Focusing and Positioning Using Instantaneous Interferometry

摘要

摘要: 在合成孔徑雷達(dá)地面運(yùn)動(dòng)目標(biāo)檢測(cè)(SAR-GMTI)中，由于場(chǎng)景中多個(gè)運(yùn)動(dòng)目標(biāo)運(yùn)動(dòng)參數(shù)不同且在合成孔徑時(shí)間內(nèi)運(yùn)動(dòng)參數(shù)隨時(shí)間變化，因此常規(guī)算法較難有效解決動(dòng)目標(biāo)信號(hào)的距離徙動(dòng)(RCM)和方位散焦問(wèn)題，難以實(shí)現(xiàn)動(dòng)目標(biāo)的精聚焦，從而影響動(dòng)目標(biāo)定位精度。該文提出一種基于瞬時(shí)干涉的動(dòng)目標(biāo)精聚焦和定位方法。首先提取單個(gè)動(dòng)目標(biāo)信號(hào)，精提取瞬時(shí)干涉相位(IIP)并結(jié)合徑向速度解模糊得到動(dòng)目標(biāo)瞬時(shí)徑向速度，經(jīng)過(guò)距離徙動(dòng)補(bǔ)償并最終實(shí)現(xiàn)動(dòng)目標(biāo)的精聚焦，提高動(dòng)目標(biāo)定位精度。實(shí)測(cè)數(shù)據(jù)處理結(jié)果驗(yàn)證了該方法的有效性。
- 合成孔徑雷達(dá) /
- 地面運(yùn)動(dòng)目標(biāo)檢測(cè) /
- 瞬時(shí)干涉 /
- 徑向速度模糊
Abstract: In Synthetic Aperture Radar-Ground Moving Target Indication (SAR-GMTI) processing, it is difficult to solve the Range Cell Migration (RCM) and azimuth defocusing problems simultaneously since the motion parameters of each moving target is different, which makes the high-accuracy focusing of moving target unattainable, thus affects the accuracy of positioning. A high-accuracy focusing and positioning of moving-targets method based on instantaneous interferometry is proposed in this paper. Firstly, single moving target can be extracted. After that, by iteratively extracting the high-accuracy Instantaneous Interferometric Phase (IIP) of moving target and solving the across-track velocity ambiguity, accurate across-track velocity can be obtained and utilized in RCM removing. After all, high-accuracy focusing of moving target can be achieved, which improves the accuracy of positioning. The processing results of measured data illustrate the effectiveness of the proposed method in this paper.
- Synthetic Aperture Radar (SAR) /
- Ground Moving Target Indication (GMTI) /
- Instantaneous interferometry /
- Across-track velocity ambiguity

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