FAST數(shù)字后端及超寬帶百萬通道頻譜儀算法仿真
[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(guó)科學(xué)院國(guó)家天文臺(tái);中國(guó)科學(xué)院大學(xué);貴州大學(xué)大數(shù)據(jù)與信息工程學(xué)院;中國(guó)科學(xué)院射電天文重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院自動(dòng)化研究所;
【基金】:國(guó)家自然科學(xué)基金(11373045) 天文聯(lián)合基金(U1531139) 973項(xiàng)目(2012CB821800,2015CB857103)
【分類號(hào)】:P111.44
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