FAST数字后端及超宽带百万通道频谱仪算法仿真

发布时间：2019-04-26 12:18

【摘要】：我国正在建设500m口径球面射电望远镜(FAST),为了能够充分发挥自身口径大的优势,确保望远镜在世界上的领先,将自主研发世界一流的超宽带通用型数字后端(CRANE)。在整个CRANE开发中,硬件部分通过与中科院自动化研究所的合作,不仅开发了现场可编程门阵列(FPGA)运算板FDB(FAST Digital Backend),还开发了3 Gbits/s 12 bits的宽带高精度模数转换电路板(ADC)芯片,并用此实现3 GHz带宽的一次性覆盖。此超宽带通用型数字后端同时也包括开发模拟信号前端电路板(AFB)。固件部分,目前研制者计划在FDB上实现百万级通道频谱仪——CRANE项目将优化FFT,研究级联式FFT来实现大点数FFT。一级FFT运算单元的分辨率可能会造成最终频点输出时信号失真,通过在Matlab上进行级联FFT算法仿真,研究了信号失真的情况,并用Matlab模拟还原出真实信号。
[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.
【作者单位】：中国科学院国家天文台;中国科学院大学;贵州大学大数据与信息工程学院;中国科学院射电天文重点实验室;中国科学院自动化研究所;
【基金】：国家自然科学基金(11373045) 天文联合基金(U1531139) 973项目(2012CB821800,2015CB857103)
【分类号】：P111.44

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