一種雙基星載MIMO SAR系統(tǒng)體制與處理方法

葉愷; 禹衛(wèi)東; 王偉

doi:10.11999/JEIT170149

一種雙基星載MIMO SAR系統(tǒng)體制與處理方法

doi: 10.11999/JEIT170149

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

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出版歷程
- 收稿日期: 2017-02-24
- 修回日期: 2017-08-19
- 刊出日期: 2017-11-19

Investigation on System Scheme and Processing Approach for Bistatic Spaceborne MIMO SAR

2.
(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)

摘要

摘要: 雙基星載合成孔徑雷達(dá)(SAR)利用雙平臺(tái)接收以及聯(lián)合處理回波信號(hào)，在測(cè)繪、干涉測(cè)量、目標(biāo)識(shí)別、自然災(zāi)害監(jiān)測(cè)等領(lǐng)域有重要的應(yīng)用價(jià)值。為了進(jìn)一步提升該體制的成像性能，該文提出一種采用空時(shí)編碼和短偏移正交波形的雙基星載多發(fā)多收合成孔徑雷達(dá)系統(tǒng)(MIMO SAR)。基于接收端的數(shù)字波束形成技術(shù)，該系統(tǒng)能夠有效分離提取不同波形回波數(shù)據(jù)，獲取更多空間自由度，從而同時(shí)具備雙基體制和MIMO體制的優(yōu)勢(shì)。此外，通過(guò)對(duì)獲取的不同波形圖像數(shù)據(jù)做波束形成處理，該系統(tǒng)能夠減輕2次散射干擾回波對(duì)SAR圖像的影響。仿真實(shí)驗(yàn)驗(yàn)證了該系統(tǒng)方案的有效性。
- 合成孔徑雷達(dá) /
- 多發(fā)多收 /
- 雙基 /
- 數(shù)字波束形成
Abstract: Benefiting from the combined processing of echo signals received on spatially separated platforms, bistatic spaceborne SAR has many valuable applications such as survey, interferometry, target recognition and classification, disaster monitoring, etc. In order to improve the imaging performance further, this paper presents a bistatic spaceborne Multiple-Input Multiple-Output SAR (MIMO SAR) system combined with Space-Time Coding (STC) and Short-Term Shift-Orthogonal (STSO) chirp waveforms. With the help of digital beamforming techniques on receive, different transmitting waveforms can be separated and extracted from mixed echoes, so that such enhanced architecture can achieve the advantages of both bistatic and MIMO configuration from more spatial degrees of freedom. Furthermore, it offers an opportunity for mitigating the influences of double-bounce scattering by using beamforming on multiple SAR images. The theoretical analysis is derived in detail, then validated by simulation experiments.
- SAR /
- Multiple-Input Multiple-Output (MIMO) /
- Bistatic /
- Digital Beam Forming (DBF)

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參考文獻(xiàn)(20)

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