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基于子孔徑Keystone變換的曲線軌跡大斜視SAR回波模擬

李根 馬彥恒 侯建強(qiáng) 徐公國

李根, 馬彥恒, 侯建強(qiáng), 徐公國. 基于子孔徑Keystone變換的曲線軌跡大斜視SAR回波模擬[J]. 電子與信息學(xué)報(bào), 2020, 42(9): 2261-2268. doi: 10.11999/JEIT190674
引用本文: 李根, 馬彥恒, 侯建強(qiáng), 徐公國. 基于子孔徑Keystone變換的曲線軌跡大斜視SAR回波模擬[J]. 電子與信息學(xué)報(bào), 2020, 42(9): 2261-2268. doi: 10.11999/JEIT190674
Gen LI, Yanheng MA, Jianqiang HOU, Gongguo XU. Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory[J]. Journal of Electronics & Information Technology, 2020, 42(9): 2261-2268. doi: 10.11999/JEIT190674
Citation: Gen LI, Yanheng MA, Jianqiang HOU, Gongguo XU. Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory[J]. Journal of Electronics & Information Technology, 2020, 42(9): 2261-2268. doi: 10.11999/JEIT190674

基于子孔徑Keystone變換的曲線軌跡大斜視SAR回波模擬

doi: 10.11999/JEIT190674
詳細(xì)信息
    作者簡(jiǎn)介:

    李根:男,1991年生,博士生,主要從事機(jī)動(dòng)平臺(tái)大斜視SAR成像和壓縮感知雷達(dá)成像研究

    馬彥恒:男,1968年生,教授,博士生導(dǎo)師,主要從事機(jī)動(dòng)SAR成像、低小慢目標(biāo)探測(cè)等方向的研究

    侯建強(qiáng):男,1991年生,博士生,主要從事曲線SAR 3維成像研究

    徐公國:男,1990年生,博士生,主要從事雷達(dá)信號(hào)處理與傳感器融合研究

    通訊作者:

    李根 radarlg@163.com

  • 中圖分類號(hào): TN958

Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory

  • 摘要: 大機(jī)動(dòng)條件下的曲線軌跡大斜視SAR系統(tǒng)傳遞函數(shù)具有復(fù)雜的多維空變性,現(xiàn)有的高效頻域回波模擬算法均難以實(shí)現(xiàn)擴(kuò)展場(chǎng)景的高精度回波模擬。為此,該文提出一種基于子孔徑Keystone變換的機(jī)動(dòng)SAR回波模擬方法。該方法根據(jù)距離徙動(dòng)校正后的距離壓縮函數(shù)對(duì)場(chǎng)景的距離壓縮回波進(jìn)行快速模擬,然后通過高精度的距離向逆處理實(shí)現(xiàn)擴(kuò)展場(chǎng)景的回波模擬。為減少殘余距離徙動(dòng)對(duì)回波模擬精度的影響,距離向處理過程中采用子孔徑Keystone變換的方法實(shí)現(xiàn)空變距離徙動(dòng)的精確校正。理論分析和仿真結(jié)果表明,所提方法能夠快速高精度地模擬擴(kuò)展場(chǎng)景的機(jī)動(dòng)平臺(tái)大斜視SAR原始回波數(shù)據(jù)。
  • 圖  1  曲線軌跡SAR成像幾何模型

    圖  2  距離向處理流程

    圖  3  曲線軌跡大斜視SAR回波模擬流程圖

    圖  4  距離壓縮信號(hào)的截取對(duì)ISLR的影響

    圖  5  多倍子孔徑拼接下β對(duì)方位向測(cè)量指標(biāo)的影響

    圖  6  散射點(diǎn)的分布示意圖和成像結(jié)果

    圖  7  面目標(biāo)回波仿真效果分析

    圖  8  距離窗長(zhǎng)因子對(duì)圖像量化指標(biāo)的影響

    表  1  仿真參數(shù)

    SAR系統(tǒng)參數(shù)數(shù)值運(yùn)動(dòng)參數(shù)數(shù)值
    載頻15 GHz斜視角60°
    距離帶寬300 MHz平臺(tái)高度4 km
    距離過采樣因子1.2中心斜距13 km
    合成孔徑時(shí)間3 s速度(150, 0, –35) m/s
    脈沖寬度5 μs加速度(2.2, 1.2, –0.8) m/s2
    脈沖重復(fù)頻率2 kHz加加速度(0.2, 0.1, –0.1) m/s3
    天線波束寬度14°
    下載: 導(dǎo)出CSV

    表  2  點(diǎn)目標(biāo)的方位向測(cè)量指標(biāo)量化分析結(jié)果

    點(diǎn)目標(biāo)PAREMWREPSLRE(dB)ISLRE(dB)
    11.3e-031.0e-046.1e-03–2.8e-03
    25.2e-061.0e-067.1e-068.7e-06
    31.2e-052.1e-061.4e-043.2e-05
    41.5e-045.2e-066.5e-046.8e-05
    下載: 導(dǎo)出CSV
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  • 收稿日期:  2019-09-03
  • 修回日期:  2020-05-29
  • 網(wǎng)絡(luò)出版日期:  2020-06-04
  • 刊出日期:  2020-09-27

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