• 제목/요약/키워드: radio astronomy

검색결과 660건 처리시간 0.025초

Pi2 pulsations in a small plasmasphere

  • Kim Khan-Hyuk;Lee Dong-Hun;Moon Yong-Jae;Pyo You-Sun
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • 한국우주과학회 2005년도 한국우주과학회보 제14권1호
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    • pp.65-65
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    • 2005
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THE RADIO-FAR INFRARED CORRELATION IN THE NEP DEEP FIELD

  • Barrufet, Laia;White, Glenn J.;Pearson, Chris;Serjeant, Stephen;Lim, Tanya;Matsuhara, Hideo;Oi, Nagisa;Karouzos, Marios;AKARI-NEP Team
    • 천문학논총
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    • 제32권1호
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    • pp.267-269
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    • 2017
  • We report the results of a multi-wavelength study in the North Ecliptic Pole (NEP) deep field and examine the far infrared-radio correlation (FIRC) for high and low redshift objects. We have found a correlation between the GMRT data at 610 MHz and the Herschel data at $250{\mu}m$ that has been used to define a spectral index. This spectral index shows no evolution against redshift. As a result of the study, we show a radio colour-infrared diagram that can be used as a redshift indicator.

The Square Kilometre Array in Australia

  • Bock, Douglas C.J.
    • 천문학회보
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    • 제37권2호
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    • pp.63-63
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    • 2012
  • The Square Kilometre Array (SKA) will be the world's largest and most sensitive radio telescope. It will address a wide range of fundamental questions in physics, astrophysics, cosmology and astrobiology. Australia, one of the two countries selected to host the SKA, has spent several years preparing by opening up the Murchison Radio-astronomy Observatory (MRO) as a uniquely radio quiet site in Western Australia, and by constructing the world's most powerful radio survey telescope, the Australian SKA Pathfinder (ASKAP). The SKA will be built in two phases. Phase I will include ASKAP, which will use novel phased-array feeds and grow to become "SKA-survey". Phase I will also include a dish array ("SKA-mid") in South Africa and a low-frequency array ("SKA-low") in Australia, and is slated for operation from about 2020. Phase II of the SKA will consist of further expansion of SKA-low and SKA-mid and is due for completion in the middle of the next decade.

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1.5Gsps 고속 디지타이징 샘플러 설계 및 개발 (Design and Development of High-Speed Digitizing Sampler with 1.5Gsps)

  • 이창훈;최한규;김광동;구본철
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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    • pp.2641-2644
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    • 2003
  • Recently, TRAO Taeduk Radio Astronomy Observatory is developing wide-band digital spectrometer for radio astronomy, which will be used as back-end signal processing unit of Dual channel SIS receiver. So in this paper, we performed development of high speed digitizing sampler for the wide-band digital autocorrelator, which can perform sampling and quantization on pseudo-random gaussian noise with the maximum conversion speed of 1.5 Gsps..

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YIG 발진기를 이용한 밀리미터파대역의 PLL 시스템 개발 (Development of Millimeter-Wave band PLL System using YIG Oscillator)

  • 이창훈;김광동;정문희;김효령;한석태
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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    • pp.116-119
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    • 2005
  • In this paper, we propose the PLL system of the local oscillator system for the millimeter wave band's radio astronomy receiving system. The development of the proposed local oscillator system based on the YIG oscillator VCO with 26.5 ${\sim}$ 40GHz specification. This system consists of the oscillator part including the YIG VCO, the harmonic mixer, and the isolator, the RF processing part including the triplexer, limiter, and RF discrimination processor. and the PLL system including YIG modulator and controller. Based on this configuration. we verify the frequency and power stability of the developed local oscillator system according to some temperature variation. From this test results we confirm the stable output frequency and power characteristic performance of the developed La system at constant temperature.

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