合成孔徑雷達(dá)的實時信號處理系統(tǒng),可以分成相對獨立的幾個階段,即A/D變換和緩存、距離向預(yù)處理器、方位向預(yù)處理器、距離向壓縮處理、轉(zhuǎn)置存儲器、方位向壓縮處理、逆轉(zhuǎn)置存儲器.合成孔徑雷達(dá)預(yù)處理的目的,就是緩解高處理數(shù)據(jù)率和低傳輸數(shù)據(jù)率的矛盾,使得在不太影響成像質(zhì)量的前提下,盡量減少傳輸?shù)臄?shù)據(jù)率,有利于后續(xù)處理的硬件實現(xiàn),做到實時處理.論文結(jié)合電子所合成孔徑雷達(dá)實時成像處理系統(tǒng),設(shè)計開發(fā)了基于Xilinx Virtex-E FPGA的星載SAR高速預(yù)處理板,該信號處理板處理能力強(qiáng),結(jié)構(gòu)緊湊,運(yùn)行效率高;其硬件電路的設(shè)計思路和結(jié)構(gòu)形式有很強(qiáng)的通用性和使用價值.論文重點研究了預(yù)處理的核心部分—固定系數(shù)FIR濾波器的設(shè)計問題.而固定系數(shù)FIR濾波器的實現(xiàn)問題的重點又是FPGA內(nèi)部的固定系數(shù)FIP濾波器實現(xiàn)問題,針對FPGA內(nèi)部的查找表資源,我們選擇目前流行的分布式算法來實現(xiàn)FIR濾波器的設(shè)計.對比于預(yù)處理器中其他濾波器設(shè)計方案,基于FPGA分布式算法的FIR濾波器的設(shè)計,避免了乘累加運(yùn)算,提高了系統(tǒng)運(yùn)行的速度并且節(jié)省了大量的FPGA資源.并且由于FPGA可編程的特性,所以可以靈活的改變?yōu)V波器的系數(shù)和階數(shù).所設(shè)計的電路簡單高速,工作正常、可靠,完全滿足了預(yù)處理器設(shè)計的技術(shù)要求.隨著超大規(guī)模集成電路技術(shù),高密度存儲器技術(shù),計算機(jī)技術(shù)的發(fā)展,一個全數(shù)字化的機(jī)載實時成像處理系統(tǒng)的研制,已經(jīng)不是非常困難的事情了.而在現(xiàn)有條件下,全數(shù)字化的高分辨率星載實時成像處理系統(tǒng)的研制,將是一個非常具有挑戰(zhàn)意義的課題,論文以星載SAR的預(yù)處理器設(shè)計為例,拋磚引玉,希望對未來全數(shù)字化星載實時成像處理系統(tǒng)的研制起到一定參考價值.
標(biāo)簽：
FPGA
SAR
星載
預(yù)處理
上傳時間：
2013-07-03
上傳用戶：lanhuaying
This white paper discusses how market trends, the need for increased productivity, and new legislation have
accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is
changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to
market. This allows FPGA users to design their own customized safety controllers and provides a significant
competitive advantage over traditional microcontroller or ASIC-based designs.
Introduction
The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in
cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas
around machines such as fast-moving robots, and distributed control systems in process automation equipment such
as those used in petrochemical plants.
The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of
electrical/electronic/programmable electronic safety-related systems,” is understood as the standard for designing
safety systems for electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was
developed in the mid-1980s and has been revised several times to cover the technical advances in various industries.
In addition, derivative standards have been developed for specific markets and applications that prescribe the
particular requirements on functional safety systems in these industry applications. Example applications include
process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC
62304), automotive (ISO 26262), power generation, distribution, and transportation.
圖Figure 1. Local Safety System
標(biāo)簽：
FPGA
安全系統(tǒng)
上傳時間：
2013-11-05
上傳用戶：維子哥哥
