“SERENDIP”的版本间差异
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The initial SERENDIP instrument was an 100 channel analog radio spectrometer covering 100 kHz of bandwidth. Subsequent instruments have been significantly more capable, with the number of channels doubling roughly every year. These instruments have been deployed at a large number of telescopes including the NRAO 90m telescope at Greenbank and the Arecibo 305m telescope. SERENDIP observations have been conducted at 400 MHz to 5 GHz frequencies, with most of the time spent near the 1.42 GHz (21 cm) neutral hydrogen and 1.66 GHz hydroxyl transitions. | The initial SERENDIP instrument was an 100 channel analog radio spectrometer covering 100 kHz of bandwidth. Subsequent instruments have been significantly more capable, with the number of channels doubling roughly every year. These instruments have been deployed at a large number of telescopes including the NRAO 90m telescope at Greenbank and the Arecibo 305m telescope. SERENDIP observations have been conducted at 400 MHz to 5 GHz frequencies, with most of the time spent near the 1.42 GHz (21 cm) neutral hydrogen and 1.66 GHz hydroxyl transitions. | ||
| + | SERENDIP 最初的仪器是一个拥有100个通道可以覆盖100kHz宽频率的模拟无线电光谱仪。随后仪器的能力持续得到了很大程度的提升，通道数几乎每年都可以翻倍增长。这些仪器被部署在许多望远镜上，其中包括在格林班克的90米射电望远镜 NRAO 和阿雷西博的305米射电望远镜。SERENDIP 的观测范围在 400 Mhz 到 5Ghz 的频率范围，其中耗费最多时间的是在 1.42Ghz（21cm）的中性氢和 1.66Ghz 的羟基频率附近。 | ||
==项目== | ==项目== | ||
2009年6月4日 (四) 20:57的版本
SERENDIP
SERENDIP (Search for Extraterrestrial Radio Emissions from Nearby Developed Intelligent Populations) is a Search for Extra-Terrestrial Intelligence (SETI) program originated at the University of California, Berkeley.
SERENDIP，全称：Search for Extraterrestrial Radio Emissions from Nearby Developed Intelligent Populations（搜寻来自地外附近智慧生命群体的无线电波），该计划起源于加州大学伯克利分校的搜寻地外文明项目（SETI）
SERENDIP takes advantage of ongoing "mainstream" radio telescope observations as a "piggy-back" or "commensal" program. Rather than having its own observation program, SERENDIP analyzes deep space radio telescope data that it obtains while other astronomers are using the telescope.
SERENDIP 利用运转中的主流射电望远镜作为“被扶持”或“共生”的一个计划。尽管 SERENDIP 并不拥有自属的观察安排， 但它可以在其他天文学家在利用望远镜的同时分析来自深层太空的无线电数据。
背景
The initial SERENDIP instrument was an 100 channel analog radio spectrometer covering 100 kHz of bandwidth. Subsequent instruments have been significantly more capable, with the number of channels doubling roughly every year. These instruments have been deployed at a large number of telescopes including the NRAO 90m telescope at Greenbank and the Arecibo 305m telescope. SERENDIP observations have been conducted at 400 MHz to 5 GHz frequencies, with most of the time spent near the 1.42 GHz (21 cm) neutral hydrogen and 1.66 GHz hydroxyl transitions.
SERENDIP 最初的仪器是一个拥有100个通道可以覆盖100kHz宽频率的模拟无线电光谱仪。随后仪器的能力持续得到了很大程度的提升，通道数几乎每年都可以翻倍增长。这些仪器被部署在许多望远镜上，其中包括在格林班克的90米射电望远镜 NRAO 和阿雷西博的305米射电望远镜。SERENDIP 的观测范围在 400 Mhz 到 5Ghz 的频率范围，其中耗费最多时间的是在 1.42Ghz（21cm）的中性氢和 1.66Ghz 的羟基频率附近。
项目
The most recently deployed SERENDIP spectrometer, SERENDIP IV, consists of a 168 million channel spectrometer covering 100 MHz of bandwidth in the spectral range between 1.37 GHz and 1.47 GHz. It has been installed and operating nearly continuously at the Arecibo telescope since 1999. The SERENDIP IV spectrometer design is also used in the Southern SERENDIP spectrometer at the Parkes Radio Telescope in Australia, and by SETI Italia at the 35 meter Very Long Baseline Interferometry (VLBI) telescope in Medicina, Italy.