FAST數(shù)字后端及超寬帶百萬通道頻譜儀算法仿真
發(fā)布時間：2019-04-26 12:18
【摘要】：我國正在建設500m口徑球面射電望遠鏡(FAST),為了能夠充分發(fā)揮自身口徑大的優(yōu)勢,確保望遠鏡在世界上的領先,將自主研發(fā)世界一流的超寬帶通用型數(shù)字后端(CRANE)。在整個CRANE開發(fā)中,硬件部分通過與中科院自動化研究所的合作,不僅開發(fā)了現(xiàn)場可編程門陣列(FPGA)運算板FDB(FAST Digital Backend),還開發(fā)了3 Gbits/s 12 bits的寬帶高精度模數(shù)轉換電路板(ADC)芯片,并用此實現(xiàn)3 GHz帶寬的一次性覆蓋。此超寬帶通用型數(shù)字后端同時也包括開發(fā)模擬信號前端電路板(AFB)。固件部分,目前研制者計劃在FDB上實現(xiàn)百萬級通道頻譜儀——CRANE項目將優(yōu)化FFT,研究級聯(lián)式FFT來實現(xiàn)大點數(shù)FFT。一級FFT運算單元的分辨率可能會造成最終頻點輸出時信號失真,通過在Matlab上進行級聯(lián)FFT算法仿真,研究了信號失真的情況,并用Matlab模擬還原出真實信號。
[Abstract]:In order to give full play to the advantages of its own large aperture and ensure the telescope's leading position in the world, China is building a 500m spherical radio telescope, (FAST), which will independently develop the world-class ultra-wideband universal digital back-end (CRANE). In the whole CRANE development, the hardware part not only developed the field programmable gate array (FPGA) arithmetic board FDB (FAST Digital Backend), through the cooperation with the Institute of Automation of the Chinese Academy of Sciences, but also developed the field programmable gate array. A 3 Gbits/s 12 bits wide band high precision A / D conversion circuit board (ADC) chip is also developed, which can be used to realize one-off coverage of 3 GHz bandwidth. This ultra-wideband general-purpose digital backend also includes the development of analog signal front-end circuit boards (AFB). Firmware part, the current developer plans to implement one million channel spectrometers on FDB-the CRANE project will optimize the FFT, research cascade FFT to achieve a large number of FFT. The resolution of the first-level FFT operation unit may cause the signal distortion when the final frequency point is output. Through the simulation of cascaded FFT algorithm on Matlab, the distortion of the signal is studied, and the real signal is restored by Matlab simulation.
【作者單位】： 中國科學院國家天文臺;中國科學院大學;貴州大學大數(shù)據(jù)與信息工程學院;中國科學院射電天文重點實驗室;中國科學院自動化研究所;
【基金】：國家自然科學基金(11373045) 天文聯(lián)合基金(U1531139) 973項目(2012CB821800,2015CB857103)
【分類號】：P111.44
本文編號：2466058
[Abstract]:In order to give full play to the advantages of its own large aperture and ensure the telescope's leading position in the world, China is building a 500m spherical radio telescope, (FAST), which will independently develop the world-class ultra-wideband universal digital back-end (CRANE). In the whole CRANE development, the hardware part not only developed the field programmable gate array (FPGA) arithmetic board FDB (FAST Digital Backend), through the cooperation with the Institute of Automation of the Chinese Academy of Sciences, but also developed the field programmable gate array. A 3 Gbits/s 12 bits wide band high precision A / D conversion circuit board (ADC) chip is also developed, which can be used to realize one-off coverage of 3 GHz bandwidth. This ultra-wideband general-purpose digital backend also includes the development of analog signal front-end circuit boards (AFB). Firmware part, the current developer plans to implement one million channel spectrometers on FDB-the CRANE project will optimize the FFT, research cascade FFT to achieve a large number of FFT. The resolution of the first-level FFT operation unit may cause the signal distortion when the final frequency point is output. Through the simulation of cascaded FFT algorithm on Matlab, the distortion of the signal is studied, and the real signal is restored by Matlab simulation.
【作者單位】： 中國科學院國家天文臺;中國科學院大學;貴州大學大數(shù)據(jù)與信息工程學院;中國科學院射電天文重點實驗室;中國科學院自動化研究所;
【基金】：國家自然科學基金(11373045) 天文聯(lián)合基金(U1531139) 973項目(2012CB821800,2015CB857103)
【分類號】：P111.44
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