抄録
An 8×8 = 64 element digital interferometer was developed at Waseda University (1989-1995). It was an equally spaced two dimentional array of 2.4 m dishes at 10.6 GHz, and a 2D FFT processor was used for Nyquist rate imaging. Recently a spatial-temporal (2+1)D FFT processor has been developed for pulsar survey (1996-2000), in which a first 2D spatial FFT transforms the electric fields of cordinate represented to those of momentum represented. We obtain the electric fields in each 64 direction at Nyquist rate by the 2D spatial Fourier transform. The following temporal 1D FFT gives the spectrum of 64ch or 256ch to 64 directions respectively also at Nyquist rate. The total bandwidths of each direction are 20 MHz and the resulting frequency resolutions are 20/64 MHz or 20/256 MHz. For sensitive pulsar survey, we also have developed an interferometric array of 20 m spherical dishes in Nasu flat, 160 km north of Tokyo. Five dishes are completed at present. Normal temperature receivers of high electron mobility transistors (HEMT) are used at 1.4GHz observation and the receiver noise temperatures are below 40K. Expected rms detection limit ΔT is about 10 -2 K under the condition of 20 MHz band widths and 1s integration time. Preliminary results of zenith survey at δ = 40 deg using a single dish show ΔT = 0.03 K without switching. Sub-reflecters and feed horns were designed so as to observe 5 deg off directions from zenith and they rotate around Az axis. It enable us to survey the declination zone of 32≤δ≤42 deg.
| 元の言語 | English |
|---|---|
| ホスト出版物のタイトル | Proceedings of SPIE - The International Society for Optical Engineering |
| 出版者 | Society of Photo-Optical Instrumentation Engineers |
| ページ | 73-85 |
| ページ数 | 13 |
| 巻 | 4015 |
| 出版物ステータス | Published - 2000 |
| イベント | Radio Telescopes - Munich, Ger 継続期間: 2000 3 27 → 2000 3 30 |
Other
| Other | Radio Telescopes |
|---|---|
| 市 | Munich, Ger |
| 期間 | 00/3/27 → 00/3/30 |
Fingerprint
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
これを引用
Pulsar huge array with Nyquist rate digital lens and prism. / Daishido, Tsuneaki; Tanaka, Naoki; Takeuchi, Hiroshi; Akamine, Yukinori; Fujii, Fumiyuki; Kuniyoshi, Masaya; Suemitsu, Taisei; Gotoh, Kentarao; Mizuki, Saori; Mizuno, Keiju; Suziki, Tomoya; Asuma, Kuniyuki.
Proceedings of SPIE - The International Society for Optical Engineering. 巻 4015 Society of Photo-Optical Instrumentation Engineers, 2000. p. 73-85.研究成果: Conference contribution
}
TY - GEN
T1 - Pulsar huge array with Nyquist rate digital lens and prism
AU - Daishido, Tsuneaki
AU - Tanaka, Naoki
AU - Takeuchi, Hiroshi
AU - Akamine, Yukinori
AU - Fujii, Fumiyuki
AU - Kuniyoshi, Masaya
AU - Suemitsu, Taisei
AU - Gotoh, Kentarao
AU - Mizuki, Saori
AU - Mizuno, Keiju
AU - Suziki, Tomoya
AU - Asuma, Kuniyuki
PY - 2000
Y1 - 2000
N2 - An 8×8 = 64 element digital interferometer was developed at Waseda University (1989-1995). It was an equally spaced two dimentional array of 2.4 m dishes at 10.6 GHz, and a 2D FFT processor was used for Nyquist rate imaging. Recently a spatial-temporal (2+1)D FFT processor has been developed for pulsar survey (1996-2000), in which a first 2D spatial FFT transforms the electric fields of cordinate represented to those of momentum represented. We obtain the electric fields in each 64 direction at Nyquist rate by the 2D spatial Fourier transform. The following temporal 1D FFT gives the spectrum of 64ch or 256ch to 64 directions respectively also at Nyquist rate. The total bandwidths of each direction are 20 MHz and the resulting frequency resolutions are 20/64 MHz or 20/256 MHz. For sensitive pulsar survey, we also have developed an interferometric array of 20 m spherical dishes in Nasu flat, 160 km north of Tokyo. Five dishes are completed at present. Normal temperature receivers of high electron mobility transistors (HEMT) are used at 1.4GHz observation and the receiver noise temperatures are below 40K. Expected rms detection limit ΔT is about 10 -2 K under the condition of 20 MHz band widths and 1s integration time. Preliminary results of zenith survey at δ = 40 deg using a single dish show ΔT = 0.03 K without switching. Sub-reflecters and feed horns were designed so as to observe 5 deg off directions from zenith and they rotate around Az axis. It enable us to survey the declination zone of 32≤δ≤42 deg.
AB - An 8×8 = 64 element digital interferometer was developed at Waseda University (1989-1995). It was an equally spaced two dimentional array of 2.4 m dishes at 10.6 GHz, and a 2D FFT processor was used for Nyquist rate imaging. Recently a spatial-temporal (2+1)D FFT processor has been developed for pulsar survey (1996-2000), in which a first 2D spatial FFT transforms the electric fields of cordinate represented to those of momentum represented. We obtain the electric fields in each 64 direction at Nyquist rate by the 2D spatial Fourier transform. The following temporal 1D FFT gives the spectrum of 64ch or 256ch to 64 directions respectively also at Nyquist rate. The total bandwidths of each direction are 20 MHz and the resulting frequency resolutions are 20/64 MHz or 20/256 MHz. For sensitive pulsar survey, we also have developed an interferometric array of 20 m spherical dishes in Nasu flat, 160 km north of Tokyo. Five dishes are completed at present. Normal temperature receivers of high electron mobility transistors (HEMT) are used at 1.4GHz observation and the receiver noise temperatures are below 40K. Expected rms detection limit ΔT is about 10 -2 K under the condition of 20 MHz band widths and 1s integration time. Preliminary results of zenith survey at δ = 40 deg using a single dish show ΔT = 0.03 K without switching. Sub-reflecters and feed horns were designed so as to observe 5 deg off directions from zenith and they rotate around Az axis. It enable us to survey the declination zone of 32≤δ≤42 deg.
UR - http://www.scopus.com/inward/record.url?scp=0033715196&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033715196&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0033715196
VL - 4015
SP - 73
EP - 85
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - Society of Photo-Optical Instrumentation Engineers
ER -