基于方位空變斜距模型的大斜視機(jī)動(dòng)平臺(tái)波數(shù)域SAR成像算法

董祺; 楊澤民; 李震宇; 孫光才; 邢孟道

doi:10.11999/JEIT160785

基于方位空變斜距模型的大斜視機(jī)動(dòng)平臺(tái)波數(shù)域SAR成像算法

doi: 10.11999/JEIT160785

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61301292)，空間測(cè)控通信創(chuàng)新探索基金(201509A)

計(jì)量
- 文章訪問(wèn)數(shù): 1149
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-07-22
- 修回日期: 2016-11-24
- 刊出日期: 2016-12-19

Wavenumber-domain Imaging Algorithm for High Squint SAR Based on Azimuth Variation Range Model

Funds:

The National Natural Science Foundation of China (61301292), The AeroSpace T.T. C. Innovation Program (201509A)

摘要

摘要: 由于加速度的存在，非線性軌跡的大斜視機(jī)動(dòng)平臺(tái)的SAR成像是一個(gè)亟待研究的問(wèn)題。傳統(tǒng)的斜距模型一般沒(méi)有考慮加速度帶來(lái)的點(diǎn)目標(biāo)方位空變，在加速度存在的情況下難以獲得良好的聚焦效果。為了解決加速度帶來(lái)的影響，該文提出一種帶加速度的非線性軌跡的方位空變模型，在此基礎(chǔ)上提出一種大斜視波數(shù)域成像算法，通過(guò)空變?yōu)V波函數(shù)去除加速度帶來(lái)的方位調(diào)頻率變化和多普勒中心空變。最后通過(guò)誤差分析證明了所提方位空變模型的有效性，并通過(guò)仿真對(duì)比實(shí)驗(yàn)結(jié)果證明了所提成像算法的有效性。
- 合成孔徑雷達(dá) /
- 大斜視 /
- 方位空變 /
- 斜距模型
Abstract: Due to the acceleration in the moving of the platform, the SAR imaging of highly squinted maneuvering platform becomes a problem to be solved urgently. The majority of currently existing range models fail in taking the azimuth-variation into consideration, so the well-focused images are not obtained. To solve these problems, a new azimuth-variation range model under the non-linear trajectory caused by acceleration is constructed. Based on this model, a wavenumber-domain imaging algorithm for high squint SAR is proposed, which takes advantage of the azimuth-variation filter to remove the azimuth chirp rate changes and Doppler center changes caused by the acceleration. By the analysis of the model error, the precision of the model is confirmed. Contrast simulation results are presented to valid the superiority of the proposed approach.
- Synthetic Aperture Radar (SAR) /
- High squint /
- Azimuth variation /
- Range model

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參考文獻(xiàn)(24)

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