• Title, Summary, Keyword: microwave radiometer

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Combined Microwave Radiometer and Micro Rain Radar for Analysis of Cloud Liquid Water

  • Yang, Ha-Young;Chang, Ki-Ho;Kang, Seong-Tae
    • Journal of the Chosun Natural Science
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    • v.6 no.1
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    • pp.12-15
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    • 2013
  • To combine the micro rain radar and microwave radiometer cloud liquid water, we estimate the cloud physical thickness from the difference between the MTSAT-1R cloud top height and cloud base height of visual observation of Daegwallyeong weather station, and the cloud liquid water path of micro rain radar is obtained by multiplying the liquid water content of micro rain radar and the estimated cloud physical thickness. The trend of microwave radiometer liquid water path agrees with that of the micro rain radar during small precipitation. We study these characteristics of micro rain radar and microwave radiometer for small precipitation to obtain the combined cloud water content of micro rain radar and microwave radiometer, constantly operated regardless to the rainfall.

Initial Experiment Results in the Development of a L-Band Microwave Radiometer for Remote Sensing of Sea and River Surface Salinity (해수 및 하천수의 염분농도 원격탐사용 L-Band M/W Radiometer의 개발 및 초기 실험결과)

  • Kim, Sang-Bong;Kim, Ji-Hoon;Son, Hong-Min
    • Proceedings of the KSRS Conference
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    • pp.65-69
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    • 2007
  • A L-Band microwave radiometer for remote sensing of sea and river surface salinity has been developed. The processes of the design and implementation of the microwave radiometer, and the experiment results are presented in this paper. The developed L-Band microwave radiometer was field-tested in Sum-Jin River. The initial results shows that the microwave radiometer measures the sea and river surface salinity with the sensitivity of 1.5psu successfully.

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A Study on a Human Body Detection Sensor Using Microwave Radiometer Technologies (마이크로파 라디오미터 기술을 응용한 인체 감지 센서에 관한 연구)

  • Son, Hong-Min;Park, Hong-Kyun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.3
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    • pp.333-340
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    • 2015
  • In this paper, we propose a passive microwave sensor for detecting human body using microwave radiometer technologies. The proposed sensor detects human body by measuring the change of the received radiation power from fixed background object due to human body. A C-band microwave radiometer is designed and implemented. The received radiation power changes due to human body is measured by the C-band microwave radiometer, and the effectiveness of the proposed sensor is evaluated by the measurement result analysis.

DESIGN OF HIGH SENSITIVE SP ACEBORNE MICROWAVE RADIOMETER DREAM ON STSAT-2

  • Kim Sung-Hyun;Lee Ho-Jin;Yun Seok-Hun;Chae Chun-Sik;Park Hyuk;Kim Yong-Hoon;Park Jeong-oh;Sim Eun-Sup;Zhang De-Hai;Jiang Jing-Shan
    • Proceedings of the KSRS Conference
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    • pp.526-529
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    • 2005
  • Dual-channel Radiometers for Earth and Atmosphere Monitoring (DREAM) is the Korean first spaceborne microwave radiometer which is the main payload of Science and Technology SATellite-2 (STSAT-2). STSAT-2 will be launched by Korea Space Launch Vehicle-l (KSL V-I) at NARO Space Center in Korea in 2007. DREAM is a two-channel, total power microwave radiometer with the center frequencies of 23.8 GHz and 37 GHz. The spaceborne radiometer is composed of an antenna unit, a receiver unit, and a data acquisition/processing unit. The bandwidths of radiometer are 600 MHz at 23.8 GHz and 1000 MHz at 37 GHz. The integration time of two channels is 200 rns. The sensitivity of DREAM is less than 0.5 K. This paper presents the required performance and system design of DREAM in detail.

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System Requirement Analysis of Passive Microwave Radiometer in Earth Observation Satellite (지구관측위성 수동형 마이크로파 라디오미터의 시스템 설계 요구 사항 분석 연구)

  • Ryu, Sang-Burm;Yong, Sang-Soon;Lee, Sang-Kon;Lee, Seung-Hoon
    • Journal of Satellite, Information and Communications
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    • v.7 no.2
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    • pp.87-96
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    • 2012
  • In this research, we describe recent technologies and system requirements of the passive microwave radiometer used in Earth observation satellites. And we classify types of microwave radiometer system for Earth observation satellites according to observation targets and ways to scan and discuss a design method. Also, requirements of passive radiometer for Earth observation missions in the latest practical examples used and developed are analyzed in this research.

CORRECTION OF THE EFFECT OF RELATIVE WIND DIRECTION ON WIND SPEED DERIVED BY ADVANCED MICROWAVE SCANNING RADIOMETER

  • Konda, Masanori;Shibata, Akira
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.386-389
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    • 2006
  • The sea surface wind speed (SSWS) derived by microwave radiometer can be contaminated by change of microwave brightness temperature owing to the angle between the sensor azimuth and the wind direction (Relative Wind Direction). We attempt to correct the contamination to the SSWS derived by Advanced Microwave Scanning Radiometer (AMSR) on Advanced Earth Observing Satellite II (ADEOS-II), by applying the method proposed by Konda and Shibata (2004). The improvement of accuracy of the SSWS estimation amounts to roughly 60% of the error caused by the RWD effect.

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Study on effective band of advanced microwave scanning radiometer (AMSR) for observing first year sea ice in the Okhotsk Sea by airborne microwave radiometer (AMR)

  • Nakayama, Masashige;Nishio, Fumihiko;Tanikawa, Tomonori;Cho, Kohei;Shimoda, Haruhisa
    • Proceedings of the KSRS Conference
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    • pp.456-461
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    • 1999
  • It is very important for monitoring the interannual variability of sea ice extents in the Okhotsk Sea because the global warming has firstly appeared around the Okhotsk Sea, locating around the southernmost region of sea ice cover in the Northern Hemisphere. In order to develop the sea ice concentration algorithm by microwave sensors onboard satellite, electromagnetic properties of sea ice in the Okhotsk Sea, therefore, were observed by airborne microwave radiometer (AMR), which has the same frequencies as AMSR (Advanced Microwave Scanning Radiometer), ADEOS-II, launching on November, 2000. On this study, it is discussed how to make the image of AMR-EFOV and the video image with nadir angle under flight at the same time, and superimpose the brightness temperature data by AMR-EFOV on the video mosaiced images. For comparing SPOT image, it is clearly that the variation of brightness temperature is small in 89GHz V-pol without the sea ice types and increase at the lower frequency-band.

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Development of a Microwave Radiometer for Remote Sensing of Water Surface Temperature (수면 온도 원격탐사용 마이크로파 라디오미터의 개발)

  • Son, Hong-Min;Youn, Jeong-Beam
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.9
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    • pp.1107-1115
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    • 2012
  • This paper presents the development processes of a microwave radiometer for remote sensing of water surface temperature. Achieving the measurement accuracy within $2^{\circ}C$ for water surface temperature of $5{\sim}30^{\circ}C$, the requirements and specifications of the microwave radiometer and its receiver are drawn. The receiver with high gain, high sensitivity is designed and implemented. The receiver has the bandwidth of 50 MHz, the system gain of 45.2 dB and the sensitivity of 0.56K at 5.02 GHz. The effectiveness of the developed microwave radiometer in the measurement of water surface temperature is demonstrated experimentally. The results show the microwave radiometer can detect water surface temperature for $7.5{\sim}18^{\circ}C$ within the accuracy of $0.45^{\circ}C$.

Study on Imaging with Scanning Airborne W-band Millimeter Wave Radiometer

  • Kong, De-Cai;Kim, Yong-Hoon;Li, Jing;Zhang, Sheng-Wei;Sun, Mao-Hua;Liu, He-Guang;Jiang, Jing-Shan
    • Proceedings of the KSRS Conference
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    • pp.593-597
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    • 2002
  • The paper introduces a research on the W-band Millimeter Wave Radiometer(RADW92) through an airborne experiment. Microwave remote sensing images of part of the Yellow River and the WeiHe River are of fared. Analysis of factors influencing the image qualities as well as the resolutions to them are also included. The RADW92 is the first generation of Millimeter Wave Radiometer in China, which works with operating frequency 92 GHz, the bandwidth 2 GHz, the integration time 60ms, the system sensitivity 0.6k and the linearity better than 0.999. Cassegrain Antenna is designed for imaging by conically scanning. The result of the experiment suggested that RADW92 had been adequate for space use.

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Inverse Brightness Temperature Estimation for Microwave Scanning Radiometer

  • Park, Hyuk;Katkovnik, Vladimir;Kang, Gum-Sil;Kim, Sung-Hyun;Choi, Jun-Ho;Choi, Se-Hwan;Jiang, Jing-Shan;Kim, Yong-Hoon
    • Korean Journal of Remote Sensing
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    • v.19 no.1
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    • pp.53-59
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    • 2003
  • The passive microwave remote sensing has progressed considerably in recent years Important earth surface parameters are detected and monitored by airborne and space born radiometers. However the spatial resolution of real aperture measurements is constrained by the antenna aperture size available on orbiting platforms and on the ground. The inverse problem technique is researched in order to improve the spatial resolution of microwave scanning radiometer. We solve a two-dimensional (surface) temperature-imaging problem with a major intention to develop high-resolution methods. In this paper, the scenario for estimation of both radiometer point spread function (PSF) and target configuration is explained. The PSF of the radiometer is assumed to be unknown and estimated from the observations. The configuration and brightness temperature of targets are also estimated. To do this, we deal with the parametric modeling of observation scenario. The performance of developed algorithms is illustrated on two-dimensional experimental data obtained by the water vapor radiometer.