共查询到17条相似文献,搜索用时 353 毫秒
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基于DSP和FPGA的特点,设计了被动型氢钟数字化伺服系统,实现了对误差信号的处理。采用先进的DSP和FPGA芯片,提出了新的解决方案,整个系统由FPGA控制DSP工作并实现最后的信号输出,文中对其硬件结构和软件流程进行了阐述。 相似文献
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在VLBI(VeryLongBaselineInterferometry)数据采集终端中,用数字滤波代替模拟滤波有其显著的优势。本文首先介绍了国外在VLBI数据采集终端中采用数字滤波的进展情况,然后阐述了数字滤波在系统中的实现方案。实现数字滤波的关键是信号处理的速度,降低运算量是实现快速处理的关键,本文给出了实现FIR数字滤波器的3种结构,并在运算量方面进行了分析和比较。在这基础上,还对数字滤波的2种系统实现方案进行了具体分析。高性能的FPGA(FieldProgrammablegateArray)芯片是实现数字滤波器的较好选择,文章最后给出了基于FPGA芯片、用查表(LUT:LookUpTable)的方式实现的数字滤波系统框图。 相似文献
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《中国科学院上海天文台年刊》2014,(0)
主要介绍上海天文台利用FPGA技术研制高精度数字分频钟的设计工作。采用FPGA技术实现了诸如数码管的控制、按键的处理、高精度秒信号的产生以及与外秒间同步等设计所需功能。设计电路大大简化,使得功能更加可靠,性能更加稳定。 相似文献
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数字滤波技术应用于VLBI数据采集的方法 总被引:1,自引:0,他引:1
在VLBI(Very Long Baseline Interferometry)数据采集终端中,用数字滤波代替模拟滤波有其显著的优势。本文首先介绍了国外在VLBI数据采集终端中采用数字滤波的进展情况,然后阐述了数字滤波在系统中的实现方案。实现数字滤波的关键是信号处理的速度,降低运算量是实现快速处理的关键,本文给出了实现Fm数字滤波器的3种结构,并在运算量方面进行了分析和比较。在这基础上,还对数字滤波的2种系统实现方案进行了具体分析。高性能的FPGA(Field Programmable gate Array)芯片是实现数字滤波器的较好选择,文章最后给出了基于FPGA芯片、用查表(LUT:Look Up Table)的方式实现的数字滤波系统框图。 相似文献
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This paper describes the design, tests and preliminary results of a real-time parallel signal processor built to aid a wide
variety of pulsar observations. The signal processor reduces the distortions caused by the effects of dispersion, Faraday
rotation, doppler acceleration and parallactic angle variations, at a sustained data rate of 32 Msamples/sec. It also folds
the pulses coherently over the period and integrates adjacent samples in time and frequency to enhance the signal-to-noise
ratio. The resulting data are recorded for further off-line analysis of the characteristics of pulsars and the intervening
medium. The signal processing for analysis of pulsar signals is quite complex, imposing the need for a high computational
throughput, typically of the order of a Giga operations per second (GOPS). Conventionally, the high computational demand restricts
the flexibility to handle only a few types of pulsar observations. This instrument is designed to handle a wide variety of
Pulsar observations with the Giant Metre Wave Radio Telescope (GMRT), and is flexible enough to be used in many other high-speed,
signal processing applications. The technology used includes field-programmable-gate-array(FPGA) based data/code routing interfaces,
PC-AT based control, diagnostics and data acquisition, digital signal processor (DSP) chip based parallel processing nodes
and C language based control software and DSP-assembly programs for signal processing. The architecture and the software implementation
of the parallel processor are fine-tuned to realize about 60 MOPS per DSP node and a multiple-instruction-multiple-data (MIMD)
capability. 相似文献
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在被动型氢原子钟数字伺服电路中,使用FPGA对误差信号进行数字信号处理。设计了一种简单的低通滤波器,与传统的FIR滤波器相比,节省了FPGA的使用资源,并且性能优于传统滤波器,能够很好地应用于被动型氢钟。 相似文献
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介绍了一种基于数字信号处理器(DSP)和现场可编程门阵列(FPGA)的低频时码接收机的硬件组成,描述了该接收机系统实现时间同步的方法,阐述了DSP和FP-GA的软件设计,给出了测试和仿真结果。该设计方案具有精度高、可靠性强、扩展性好等优点。 相似文献
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An integrating spectrometer based on a two-stage polyphase digital filter bank (PDFB) algorithm is described. The first PDFB operates on a time multiplexed wideband signal, with a bandwidth up to 1 GHz. The second PDFB is performed in parallel over couples of overlapping channels from the first filterbank. The design automatically deletes the unused portions of the first filterbank channels, providing a seamless, uniform channelization of the input band. The design has been implemented and tested on the VLBI DBBC platform, using a single Xilinx XC5VLX220 FPGA. 相似文献