Instrument Design and Early In-Orbit Performance of HY-2B Scanning Microwave Radiometer

Rong, Yu; Lu, Hanchao; Li, Shujing; Zhu, Dong; Zhou, Wu; Dang, Pengju; Wang, Congcong; Xu, Jisheng; Lv, Rongchuan; Li, Hao

doi:10.1109/tgrs.2021.3095400

Cited by 10 publications

(8 citation statements)

References 29 publications

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“…This scan configuration provides excellent global coverage with a swath width of 1600 km. Each scan line contains 150 pixels Yu et al (2022). In addition, it should be noted that the original observations vary in geolocation (Figure 3) and resolution between frequencies due to the different frequency feedhorns of the SMR sharing a single reflector antenna.…”

Section: Smr Observationsmentioning

confidence: 99%

“…Haiyang‐2B (HY‐2B) is the second ocean dynamic environment satellite developed by China. Launched on October 25, 2018, it operates on a sun‐synchronous near‐polar orbit with a local equatorial crossing time of about 6:00 a.m. (descending) Yu et al (2022). Like its predecessor HY‐2A , HY‐2B is equipped with a scanning microwave radiometer (SMR) to provide information about the ocean and atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Impact of HY‐2B SMR radiance assimilation on CMA global medium‐range weather forecasts

Li,

Han

2024

Quart J Royal Meteoro Soc

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The Chinese second ocean dynamic environment satellite Haiyang‐2B (HY‐2B), was successfully launched on 25 October 2018, carrying a Scanning Microwave Radiometer (SMR) to provide the information of ocean and atmosphere. For the first time, this study investigated the impact of radiance data from the HY‐2B SMR in the Four Dimensional Variational (4DVar) Data Assimilation system of the Global Forecast System developed by the China Meteorology Administration (CMA‐GFS). Prior to the radiance assimilation, we evaluated the data quality and developed suitable quality control (QC) procedures for the HY‐2B SMR observations. In addition, the cloud liquid water path (CLWP) and ocean wind speed (OWS) were introduced as new bias correction (BC) predictors to remove the systematic bias originating from the forward operator in the CMA‐GFS 4DVar system. The assimilation effects of SMR observations were evaluated through one‐month cycling experiments. Verification with independent observations and reanalysis data has demonstrated that assimilating SMR clear‐sky radiance can greatly reduce the analysis errors for temperature and humidity, while indirectly improve the quality of wind analysis. Furthermore, significant improvements in geopotential height forecasts were found for days 1‐5 in the lower troposphere of the tropical region.This article is protected by copyright. All rights reserved.

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Section: Smr Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of HY‐2B SMR radiance assimilation on CMA global medium‐range weather forecasts

Li,

Han

2024

Quart J Royal Meteoro Soc

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“…However, microwave measurements exhibit lower spatial resolution compared to infrared measurements [5][6][7]. For instance, the spatial resolution of the infrared radiometer MODIS [8] is superior to 1 km, whereas various observation channels of the microwave radiometer SMR [9] achieve spatial resolutions optimally around 19 km and, at their worst, even as low as approximately 100 km.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the SE method is evaluated using both simulation data and satellite observation data. The satellite observation data are obtained from the scanning microwave radiometer (SMR) carried on board the Haiyang-2B (HY-2B) satellite [9]. The SMR operates in a conical scan mode.…”

Section: Introductionmentioning

confidence: 99%

“…Its observation frequencies are at 6.925, 10.75, 18.75, 23.85, and 37 GHz. Among these, the 23.85 GHz frequency has only one vertical polarization (Vpol) channel, while the other frequencies have both vertical and horizontal polarization (H-pol) channels [9]. For simplicity, in this paper, the f GHz V-pol or H-pol channels are denoted f -V or f -H, respectively, such as 6.925-V and 37-H. Because the spatial resolution of channel at 6.925 GHz is lower than that at other frequencies SMR, the demand to enhance spatial resolution at 6.925 GHz is more urgent than that at other frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Spectrum Extension of a Real-Aperture Microwave Radiometer Using a Spectrum Extension Convolutional Neural Network for Spatial Resolution Enhancement

Zhao,

Huang,

Xiao

et al. 2023

Remote Sensing

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Enhancing the spatial resolution of real-aperture microwave radiometers is an essential research topic. The accuracy of the numerical values of brightness temperatures (BTs) observed using microwave radiometers directly affects the precision of the retrieval of marine environmental parameters. Hence, ensuring the accuracy of the enhanced brightness temperature values is of paramount importance when striving to enhance spatial resolution. A spectrum extension (SE) method is proposed in this paper, which restores the suppressed high-frequency components in the scene BT spectrum through frequency domain transformation and calculations, specifically, dividing the observed BT spectrum by the conjugate of the antenna pattern spectrum and applying a Taylor approximation to suppress error amplification, thereby extending the observed BT spectrum. By using a convolutional neural network to correct errors in the calculated spectrum and then reconstructing the BT through inverse fast Fourier transform (IFFT), the enhanced BTs are obtained. Since the extended BT spectrum contains more high-frequency components, namely, the spectrum is closer to that of the original scene BT, the reconstructed BT not only achieves an enhancement in spatial resolution, but also an improvement in the accuracy of BT values. Both the results from simulated data and satellite-measured data processing illustrate that the SE method is able to enhance the spatial resolution of real-aperture microwave radiometers and concurrently improve the accuracy of BT values.

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Cosine Visibility Extension of 1-D Mirrored Aperture Synthesis by a CNN for Spatial Resolution Enhancement

Zhao

Lei

et al. 2023

IEEE Geosci. Remote Sensing Lett.

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Instrument Design and Early In-Orbit Performance of HY-2B Scanning Microwave Radiometer

Cited by 10 publications

References 29 publications

Impact of HY‐2B SMR radiance assimilation on CMA global medium‐range weather forecasts

Impact of HY‐2B SMR radiance assimilation on CMA global medium‐range weather forecasts

Spectrum Extension of a Real-Aperture Microwave Radiometer Using a Spectrum Extension Convolutional Neural Network for Spatial Resolution Enhancement

Cosine Visibility Extension of 1-D Mirrored Aperture Synthesis by a CNN for Spatial Resolution Enhancement

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