彈載合成孔徑雷達(dá)大斜視子孔徑頻域相位濾波成像算法
doi: 10.11999/JEIT140618
基金項(xiàng)目:
國(guó)家自然科學(xué)青年基金(61101245)和中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(K5051302046)資助課題
A Frequency Phase Filtering Imaging Algorithm for Highly Squint Missile-borne Synthetic Aperture Radar with Subaperture
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摘要: 彈載合成孔徑雷達(dá)(SAR)為滿足機(jī)動(dòng)性和實(shí)時(shí)性，常采用大斜視子孔徑成像處理；而大斜視SAR成像存在嚴(yán)重的距離方位耦合，時(shí)域校正距離走動(dòng)解決這一問(wèn)題會(huì)帶來(lái)方位聚焦深度問(wèn)題。針對(duì)方位聚焦深度問(wèn)題以及子孔徑特性，該文提出一種新的子孔徑成像算法頻域相位濾波算法(FPFA)，該算法在無(wú)近似瞬時(shí)斜距模型下，采用時(shí)域校正距離走動(dòng)，頻域校正彎曲，在方位頻域引入相位濾波因子校正多普勒調(diào)頻率和方位向高次項(xiàng)的空變性，并結(jié)合譜分析(SPECAN)技術(shù)實(shí)現(xiàn)方位聚焦。仿真和實(shí)測(cè)數(shù)據(jù)處理驗(yàn)證了該算法的有效性。
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關(guān)鍵詞:
- 彈載合成孔徑雷達(dá) /
- 子孔徑 /
- 大斜視 /
- 頻域相位濾波算法 /
- 譜分析技術(shù)
Abstract: The missile-borne Synthetic Aperture Radar (SAR) usually adopts the highly squint mode and subaperture to satisfy maneuvering and the real-time processing, but the signal of highly squint SAR is coupled greatly between the azimuth and range. This issue can be solved by removing the range walk in the time domain, but costs the limitation of focus depth. Due to the depth of focus and the characteristics of subaperture, a new subaperture imaging algorithmFrequency Phase Filtering Algorithm (FPFA) is proposed in this paper. Without any approximation of the slant range, the range walk can be done in the time domain and the range curvature removed in the frequency domain. Then, a new high-order equation of phase filtering factor is introduced into the frequency domain in order to correct the azimuth-dependence. Finally, the signal is focused in the Doppler domain by SPECtral ANalysis (SPECAN) technique. Both the simulation results and real data processing validate the effectiveness of the proposed method. -
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