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
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M3 - Article
AN - SCOPUS:0034349647
SN - 0004-6264
VL - 52
SP - 447
EP - 455
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
IS - 3
ER -