高效UWB-SAR平面子孔徑處理成像算法
A Efficient Planar Subarray Processing Algorithm for UWB-SAR Imaging
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摘要: 對(duì)各子孔徑進(jìn)行梯形(keystone)變換時(shí)的插值運(yùn)算是平面子孔徑處理(PSAP)算法對(duì)低頻段SAR特別是超寬帶(UWB)SAR成像時(shí)的主要瓶頸。該文提出用線性調(diào)頻變換結(jié)合Fold FFT實(shí)現(xiàn)梯形變換，提高了插值效率，并改進(jìn)了算法流程，剔除了梯形變換結(jié)合Fold FFT中的冗余運(yùn)算，極大地提高了整個(gè)算法的計(jì)算效率。計(jì)算機(jī)仿真和對(duì)實(shí)際數(shù)據(jù)進(jìn)行成像實(shí)驗(yàn)的結(jié)果表明，經(jīng)過(guò)改進(jìn)后的PSAP算法能夠用于對(duì)大場(chǎng)景高分辨率UWB-SAR的實(shí)時(shí)成像。
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關(guān)鍵詞:
- 合成孔徑雷達(dá); 超寬帶; 平面子孔徑處理; 成像算法
Abstract: The needed interpolation of keystone transformation used for every subaperture is the bottleneck of imaging for lower frequency Synthetic Aperture Radar(SAR) especially for Ultra Wide Band(UWB) SAR with Planar Sub Aperture Processing(PSAP). A new in-terpolation method for keystone transformation is presented in this paper, and by mending the algorithm, the redundant computation of its realization is eliminated, the efficiency of the algorithm is improved notably. The computer simulation and the real data test results show that the modified PSAP can be applied to real-time UWB-SAR imaging of wide scene with fine resolution. -
Perry R P, DiPictro R C, Kezma A, Vaccaro J J. SAR image formation processing using planar subarrays[J].SPIE.1994, 2230:160-170[2]Perry R P, DiPietro R C, Johnson B L, Kozma A, Vaccaro J J. Planar subarray processing for SAR imaging. IEEE International Radar Conference, 1995: 473-478.[3]DiPietro R C, Fante R L, Perry R P, et al.. Multiresolution FOPEN SAR image formation. SPIE Conference on Algorithms for Synthetic Aperture Radar Imagery, 1999, 3721: 170-188.[4]李肖冬,黃曉濤,梁甸農(nóng).SAR實(shí)時(shí)成像中交疊FFT的有效實(shí)現(xiàn).信號(hào)處理,2001,17(1):5-7. -
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