Mullti-rate DSP/FPGA-based real-time acqisition and control on the ISTTOK tokamak

作者：Carvalho B B^*; Batista A J N; Patricio F; Correia M; Fernandes H; Sousa J; Varandas C A F

来源：IEEE Transactions on Nuclear Science, 2008, 55(1): 54-58.

DOI：10.1109/TNS.2007.914208

• digital filters
• real-time systems
• signal processing
• tokamak

Data acquisition on the ISTTOK tokamak is being upgraded from VME to PCI using a general purpose especially developed transient recorder PCI acquisition board with 8 galvanic isolated 14 bit, 2 MSamples/sec channels, 512 Mbytes of SDRAM, and integrated FPGA/DSP capabilities. Due to the wide range of ISTTOK signal spectrum, data-reduction is crucial to efficiently use data retrieval and analysis systems. To avoid long latency offline processing and also to allow real-time control implemented in the DSP, multi-rate real time decimation in the FPGA has been implemented. This paper describes the data processing techniques developed using either FIR or cascaded - integrator-comb CIC filters. A digital DC baseline restorer was also implemented in the FPGA.

• 出版日期2008-2