| Project/Area Number |
09554005
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory |
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Principal Investigator |
OKUMURA Sachiko National Astronomical Observatory, Associate Professor, 電波天文学研究系, 助教授 (20224842)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAGUCHI Noriyuki National Astronomical Observatory, Professor, 地球回転研究系, 教授 (90214618)
SUNADA Kazuyoshi National Astronomical Observatory, Research Associate, 電波天文学研究系, 助手 (90270454)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥11,600,000 (Direct Cost: ¥11,600,000)
Fiscal Year 1999: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1998: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Keywords | radio astronomy / parallel processing / digital filter / signal processing / LSI / spectro scopic observations |
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| Research Abstract |
We have made research and development of high-speed parallel-processing digital filter LSI for radio astronomy. First, we have designed the digital filtering circuit having the following functions ; (a) maximum input data rate is 2 GHz at 2-bit sampling ( 64-parallel data at 32-MHz clock ). (b) different output data rates are available.
(l/2, 1/4, 1/8, 1/16,1/32, l/64 of input data rate ). This circuit will be used for the digital spectrometers of Nobeyama 45-m telescope, VLBI signal processing system, and the very large FX correlator system for the Large Millimeter and Submillimeter Array.
Next, we have made the detailed design and computer simulation of the circuit in order to integrated it to FPGA (FieId Programmable Gate Array). We used FPGAs of 10k - 20k gates, so we limited the functions of the circuit to apply for the digital spectrometer for Nobeyama 45-m telescope.
Finally, we have developed a signal test board where digital filtering LS(FPGA)s are installed. Using a commercial test pattern generator, we have measured the filter response functions for various parameters. Then we have successfully confirmed that the digital filter LSI we have designed has enough accuracy applied for radio astronomical observations.
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