### 抄録

In the Nyquist rate direct-imaging interferometer at Waseda University, a radix-4 butterfly LSI has been developed for the spatial-temporal (2+1)D FFT processor to survey pulsars. In (2+1)D FFT, the first 2D FFT is a 2D directional finding spatial FFT processing for an 8×8 pixel image. The second 1D FFT is a 1D spectral finding temporal FFT processing for a 64ch frequency analysis in each 64 pixels. Since fewer multipliers are required in radix-4 FFT than in radix-2 FFT, we have implemented radix-4 algorithms in the present butterfly LSI. This implementation, using 512 radix-4 butterfly LSIs, could reduce the circuit size of the parallel and pipeline (2+1)D FFT processor. Additional functions, such as shift registers, digital filters and post-process sections, are also included in the LSI for a radio interferometric pulsar survey.

元の言語 | English |
---|---|

ページ（範囲） | 447-455 |

ページ数 | 9 |

ジャーナル | Publications of the Astronomical Society of Japan |

巻 | 52 |

発行部数 | 3 |

出版物ステータス | Published - 2000 |

### Fingerprint

### ASJC Scopus subject areas

- Astronomy and Astrophysics
- Space and Planetary Science

### これを引用

*Publications of the Astronomical Society of Japan*,

*52*(3), 447-455.

**Radix-4 butterfly LSI in direct-imaging Waseda radio interferometer for a Pulsar survey.** / Tanaka, Naoki; Daishido, Tsuneaki; Takeuchi, Hiroshi; Akamine, Yukinori; Kuniyoshi, Masaya; Suemitsu, Taisei; Fujii, Fumiyuki; Gotoh, Kentaro; Suzuki, Tomoya; Mizuki, Saori; Mizuno, Keiju; Fukuoka, Koji; Suzuki, Masahiro.

研究成果: Article

*Publications of the Astronomical Society of Japan*, 巻. 52, 番号 3, pp. 447-455.

}

TY - JOUR

T1 - Radix-4 butterfly LSI in direct-imaging Waseda radio interferometer for a Pulsar survey

AU - Tanaka, Naoki

AU - Daishido, Tsuneaki

AU - Takeuchi, Hiroshi

AU - Akamine, Yukinori

AU - Kuniyoshi, Masaya

AU - Suemitsu, Taisei

AU - Fujii, Fumiyuki

AU - Gotoh, Kentaro

AU - Suzuki, Tomoya

AU - Mizuki, Saori

AU - Mizuno, Keiju

AU - Fukuoka, Koji

AU - Suzuki, Masahiro

PY - 2000

Y1 - 2000

N2 - In the Nyquist rate direct-imaging interferometer at Waseda University, a radix-4 butterfly LSI has been developed for the spatial-temporal (2+1)D FFT processor to survey pulsars. In (2+1)D FFT, the first 2D FFT is a 2D directional finding spatial FFT processing for an 8×8 pixel image. The second 1D FFT is a 1D spectral finding temporal FFT processing for a 64ch frequency analysis in each 64 pixels. Since fewer multipliers are required in radix-4 FFT than in radix-2 FFT, we have implemented radix-4 algorithms in the present butterfly LSI. This implementation, using 512 radix-4 butterfly LSIs, could reduce the circuit size of the parallel and pipeline (2+1)D FFT processor. Additional functions, such as shift registers, digital filters and post-process sections, are also included in the LSI for a radio interferometric pulsar survey.

AB - In the Nyquist rate direct-imaging interferometer at Waseda University, a radix-4 butterfly LSI has been developed for the spatial-temporal (2+1)D FFT processor to survey pulsars. In (2+1)D FFT, the first 2D FFT is a 2D directional finding spatial FFT processing for an 8×8 pixel image. The second 1D FFT is a 1D spectral finding temporal FFT processing for a 64ch frequency analysis in each 64 pixels. Since fewer multipliers are required in radix-4 FFT than in radix-2 FFT, we have implemented radix-4 algorithms in the present butterfly LSI. This implementation, using 512 radix-4 butterfly LSIs, could reduce the circuit size of the parallel and pipeline (2+1)D FFT processor. Additional functions, such as shift registers, digital filters and post-process sections, are also included in the LSI for a radio interferometric pulsar survey.

KW - Instrumentation: interferometers

KW - Pulsars: general

KW - Techniques: interferometric

UR - http://www.scopus.com/inward/record.url?scp=0034349647&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034349647&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034349647

VL - 52

SP - 447

EP - 455

JO - Publication of the Astronomical Society of Japan

JF - Publication of the Astronomical Society of Japan

SN - 0004-6264

IS - 3

ER -