基于運(yùn)動(dòng)補(bǔ)償?shù)膹椵d前斜視SAR成像算法

張延; 張林讓; 唐世陽(yáng)

doi:10.11999/JEIT161006

基于運(yùn)動(dòng)補(bǔ)償?shù)膹椵d前斜視SAR成像算法

doi: 10.11999/JEIT161006

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61601343, 61671361)

計(jì)量
- 文章訪問數(shù): 1369
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-09-30
- 修回日期: 2016-11-24
- 刊出日期: 2016-12-19

Novel Missile-borne Forward-looking SAR Algorithm Based on Motion Compensation

Funds:

The National Natural Science Foundation of China (61601343, 61671361)

摘要

摘要: 曲線軌跡下的彈載合成孔徑雷達(dá)(SAR)前視成像算法校正了方位時(shí)不變運(yùn)動(dòng)誤差，忽略了時(shí)變運(yùn)動(dòng)誤差，造成成像質(zhì)量下降。針對(duì)這一問題，該文提出一種基于運(yùn)動(dòng)補(bǔ)償?shù)那靶币暢上袼惴āＪ紫葘⒓铀俣确纸獬汕跋蚣铀俣群蛷较蚣铀俣?，然后將徑向加速度分解為成像平面?nèi)的加速度和垂直于成像平面的加速度，經(jīng)過分析可知，對(duì)成像質(zhì)量起決定作用的是成像平面內(nèi)的加速度，該文通過矢量方法將其補(bǔ)償。此外，對(duì)于加速度帶來(lái)的較大的距離徙動(dòng)，通過級(jí)數(shù)反演法求出信號(hào)的2維頻譜，然后結(jié)合非線性頻調(diào)變標(biāo)(NCS)算法進(jìn)行校正，取得了良好的效果。最后通過仿真實(shí)驗(yàn)證明了所提算法的有效性。
- 運(yùn)動(dòng)補(bǔ)償 /
- 曲線軌跡 /
- 彈載 /
- 非線性頻調(diào)變標(biāo)算法 /
- 級(jí)數(shù)反演法
Abstract: For missile-borne forward-looking SAR in curve trajectory, time-variant motion errors are ignored, leading to degradations in imaging result. This paper proposes a missile-borne forward-looking SAR algorithm based on motion compensation to solve the above problem. The acceleration is divided into forward-looking acceleration and cross-track acceleration, the second phase error and cubic phase error caused by these two accelerations are analyzed in detail. For the cross-track acceleration component, it can be divided into the acceleration vertical to the imaging plane and the one in imaging plane further. Via such dividing, the phase errors caused by acceleration are compensated by using vectorial methods. Moreover, for range migration, it is compensated through Nonlinear Chirp Scaling (NCS) approach based on the accurate 2-D spectrum acquired by the Method of Series Reversion (MSR). The simulated results are given to illustrate the validity of the proposed algorithm.
- Motion compensation /
- Curve trajectory /
- Missile-borne /
- Nonlinear Chirp Scaling (NCS) algorithm /
- Method of Series Reversion (MSR)

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參考文獻(xiàn)(23)

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