基于斜距等效的彈載雙基前視SAR相位空變校正方法
發(fā)布時(shí)間:2018-09-01 10:29
【摘要】:作為一種特殊的新型雙基合成孔徑雷達(dá)(SAR)成像模式,彈載雙基前視SAR(Missile-borne Bistatic Forward-Looking SAR,MBFL-SAR)可實(shí)現(xiàn)末端俯沖段前視2維成像。然而距離歷程中雙根號及高階項(xiàng)的同時(shí)存在導(dǎo)致其2維頻譜難以有效獲得,且收發(fā)平臺高度的不斷變化和運(yùn)動方向的不同造成回波相位的空變特性。該文提出一種基于斜距等效的MBFL-SAR相位空變校正方法。該方法利用修正的雙曲線斜距模型將具有雙根號和高階項(xiàng)的距離歷程表達(dá)式等效并簡化為單根號斜距表達(dá)形式,進(jìn)而利用駐定相位原理求得其高精度2維頻譜;隨后通過多項(xiàng)式高階擬合的方法精確補(bǔ)償頻譜中空變的相位項(xiàng),完成場景成像聚焦。該方法可高精度成像且相對于傳統(tǒng)方法聚焦性能有顯著提高。最后,通過仿真驗(yàn)證了所提方法的有效性。
[Abstract]:As a special new bistatic synthetic aperture radar (SAR) imaging mode, the bistatic forward looking SAR (Missile-borne Bistatic Forward-Looking SAR,MBFL-SAR) can realize the 2-D forward imaging of the terminal subduction segment. However, the existence of dual root and higher order terms in the distance history leads to the difficulty of obtaining the two-dimensional spectrum effectively, and the spatial variation of echo phase is caused by the constant change of the height of the transceiver platform and the difference of the direction of motion. In this paper, a MBFL-SAR phase space change correction method based on oblique distance equivalent is proposed. By using the modified hyperbolic oblique distance model, the distance history expression with double root sign and higher order term is equivalent and simplified to a single root sign oblique distance expression, and then the high-precision two-dimensional spectrum is obtained by using the stationary phase principle. Then the phase terms of the frequency spectrum are accurately compensated by polynomial high order fitting to complete the scene focus. This method can be used for high accuracy imaging and can improve the focusing performance compared with the traditional method. Finally, the effectiveness of the proposed method is verified by simulation.
【作者單位】: 西安電子科技大學(xué)雷達(dá)信號處理國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金(61001211,61303035,61471283) 中央高;究蒲袠I(yè)務(wù)費(fèi)(K5051202016)~~
【分類號】:TN957.52
本文編號:2216920
[Abstract]:As a special new bistatic synthetic aperture radar (SAR) imaging mode, the bistatic forward looking SAR (Missile-borne Bistatic Forward-Looking SAR,MBFL-SAR) can realize the 2-D forward imaging of the terminal subduction segment. However, the existence of dual root and higher order terms in the distance history leads to the difficulty of obtaining the two-dimensional spectrum effectively, and the spatial variation of echo phase is caused by the constant change of the height of the transceiver platform and the difference of the direction of motion. In this paper, a MBFL-SAR phase space change correction method based on oblique distance equivalent is proposed. By using the modified hyperbolic oblique distance model, the distance history expression with double root sign and higher order term is equivalent and simplified to a single root sign oblique distance expression, and then the high-precision two-dimensional spectrum is obtained by using the stationary phase principle. Then the phase terms of the frequency spectrum are accurately compensated by polynomial high order fitting to complete the scene focus. This method can be used for high accuracy imaging and can improve the focusing performance compared with the traditional method. Finally, the effectiveness of the proposed method is verified by simulation.
【作者單位】: 西安電子科技大學(xué)雷達(dá)信號處理國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金(61001211,61303035,61471283) 中央高;究蒲袠I(yè)務(wù)費(fèi)(K5051202016)~~
【分類號】:TN957.52
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