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1、維普資訊http://www.cqvip.com計算機研究與發(fā)展ISSN1000.1239}CN11-1777
2、TPJournalofComputerResearchandDevelopment45(2):342~347,2008FPGA實時實現(xiàn)PGA算法的研究郝智泉王貞松劉波。(中國科學院計算技術(shù)研究所北京100080)(中國科學院研究生院北京100049)(haozhq@gmail.com)ResearchonReal-TimeRealizingPGAAlgorithminFPGAHaoZhiquan一
3、,WangZhensong,andLiuBo·(InstituteofComputingTechnology,ChineseAcademyofSciences,BeOing100080)(GraduateUniversityoftheChineseAcademyofSciences,BeOing100049)AbstractSyntheticapertureradar(SAP,)imagehassomecommonfeaturessuchashugedatavolume,relativecomplexalg
4、orithm,etc.RealizingSARimagealgorithmisworthyofbeingstudiedinthedomainofEHPC(embeddedhighperformancecomputing).FPGAisusedasahighefficientandlowcostsolutioninEHPCforitshighperformanceandreconfigurableability.Anewphasegradientautofocus(PGA)algorithmforrealti
5、mecaseisproposed,whichcanachieveconvergencefocusingqualitywithlessiterationandfewercomputationloadsthantheclassicPGAalgorithm.TheprincipleofhowtomaptheimprovedalgorithmtoFPGAarchitectureisdiscussed.Somekeycomputingcomponentsabstractedfromthealgorithm,sucha
6、sCORDICprocessor,complexvectorcorrelatorandprominentscatterfilterarealsodiscussed.Themotivationandaimofthisworkistodevelopanumericallyefficient,accurateandrobustDopplerrateestimatorwithreasonablearchitectureinFPGA,whichcanbeusedinahigh—throughput—rateproce
7、ssorforfutureonboardimagingsystem.Becauselogicresourcesareeffectivelyused,constraintsonvolume,weight,andpowerareeasiertomeetwithoutsacrificeoflosingreal—timeperformance.Experimentresultindicatesthattheimprovedalgorithmreducesiterationtimesandtheprecisionca
8、nsatisfytheimagingsystem.KeywordsSAR;EHPC;phasegradient;auto—focus;FPGA摘要合成孔徑雷達(SAR)成像具有數(shù)據(jù)量巨大、算法比較復(fù)雜等特點.如何實時實現(xiàn)SAR成像的相關(guān)算法是嵌入式高性能計算領(lǐng)域一個值得研究的問題.FPGA以其高性能、可重構(gòu)等優(yōu)勢,被越來越多地應(yīng)用到嵌入式高性能計算領(lǐng)域中作為一種高效低成本的解決方案.針對SAR成像中多普勒調(diào)頻率估計的經(jīng)典算法——PGA算法,以FPGA作為實現(xiàn)平臺,通過對算法的本質(zhì)的挖掘,提出了適于FPGA實
9、時實現(xiàn)的對于經(jīng)典算法的改進算法.同時也闡述了將改進算法映射到FPGA實現(xiàn)的設(shè)計過程.實驗結(jié)果表明。改進的算法較經(jīng)典的PGA算法明顯地減少了迭代次數(shù),在SOC中通過硬件的運算精度能夠滿足系統(tǒng)的要求.關(guān)鍵詞SAR;嵌入式高性能計算;相位梯度;自聚焦;FPGA中圖法分類號TP303收稿日期:2006—02—20;修回日期:2007—08—31基金項目:國家自然科學基金項目(60303017)維普資訊http://www