A newly designed thermal/vacuum (T/V) prelaunch multiangle calibration test is proposed for Microwave Humidity and Temperature Sounder (MWHTS) onboard the Feng Yun 3D satellite. Compared with other existing tests at fix scan angle, this first to analyze measurements of MWHTS from multiscan angles. set comprehensive method established used data processing. The high-quality preprocessing methods are performed. Essential coefficients such as cold bias, hot nonlinearity coefficients, results...

The Microwave Humidity Sounder (MWHS) is a five-channel microwave radiometer in the range of 150-191 GHz onboard FengYun 3 (FY-3). Before launch FY-3A, intensive thermal vacuum (TVAC) tests for MWHS had been carried out 2-m TVAC chamber, and basic parameters such as receiver nonlinearity were obtained. Four-year operation shows that performance FY-3A remains stabile. variations among space views warm target interval scan lines generally within 20 counts. In addition, temperature fluctuation...

Fengyun (FY) satellite program is becoming the important component of global earth observing system. Its instrumental performance, i.e., data quality and stability, play a critical role to support quantitative applications, such as atmospheric surface parameter retrievals, numerical weather prediction (NWP) production Climate Data Records (CDRs). For monitoring radiative transfer models (RTMs) together with NWP fields are used simulate reference radiance in FY instrument schemes (FY-SIMS)....

The Chinese FengYun-3 (FY-3)A satellite was successfully launched on May 27, 2008, with a Microwave Temperature Sounder (MWTS) onboard. MWTS has four channels frequencies of 50.3, 53.596, 54.94, and 57.29 GHz, respectively. measurements are primarily used for profiling atmospheric temperatures from surface to lower stratosphere. is cross-track scanning instrument, its Earth-view calibrated through the warm target cold space during every scan cycle. In this paper, FY-3A channel...

On November 15, 2017, the fourth satellite, Feng Yun-3D (FY-3D), of new generation Chinese polar orbit meteorological satellites was successfully launched into orbit. As one key payloads, second-generation Microwave Humidity Sounder (MWHS II) has 15 channels for observing atmospheric temperature and moisture. In ground data processing system, calibration is completed every scanning period, then, brightness (TB) are obtained with coefficients. order to analyze performance MWHS II, year...

Abstract This study investigates precipitation observed by a set of collocated ground-based instruments in Zhuhai, coastal city located at the southern tip Pearl River Delta Guangdong Province South China. Seven months observations from tipping-bucket rain gauge (RG), two laser disdrometers (PARSIVEL and Present Weather Sensor 100 (PWS)], vertically pointing Doppler Micro Rain Radar-2 (MRR), spanning December 2021 to July 2022, are statistically evaluated provide reliable reference for...

The MicroWave Humidity Sounder 2 (MWHS-2) onboard the FY-3C satellite provides an extra important data source for atmospheric water vapor monitoring besides Microwave (MHS) and Advanced Technology (ATMS). This paper introduces MWHS-2 radiance into community Gridpoint Statistical Interpolation (GSI) global analysis system. More than one-year cycling assimilation experiments with without are performed. Results show that has similar quality to MHS ATMS. biases of stable except some sudden jumps...

Fine spectral detection can basically solve the problem of low vertical resolution at 183 GHz water-vapor absorption line, and it is expected to become one main methods for next-generation geostationary polar-orbiting satellites. Here, using data from Microwave Humidity Sounder II (MWHS-II) onboard Chinese Fengyun 3D (FY-3D) satellite in Global/Regional Assimilation Prediction System (GRAPES) Four-Dimensional Variational (4D-Var) system China Meteorological Administration (CMA), we explore...

The prototypes of China's Ku- and Ka-band PR have been successfully manufactured, the first airborne field campaign conducted. Measurement data obtained in processed to validate radar performance. Comparisons measured backscattering cross section between ADPR TRMM over sea precipitation ground-based weather radar/mobile meteorological radar/TRMM made ADPR's ability detection. Important performance indices are evaluated using datasets. overall shows dual-frequency is qualified for development...

Calibration accuracy can affect the interpretation of microwave radiometer observations and it is premise quantitative remote sensing. To calibrate radiometers to establish a relationship between output (voltage or voltage digital) input noise temperature. On-orbit calibration uses target sensor cold space as reference sources. It has been found that performance same instrument will be degraded with aging components. Observations from instruments different satellite generations may...

To make better use of microwave radiance observations for data assimilation, removal radiances contaminated by hydrometeor particles is one the most important steps. Generally, all below middle troposphere are eliminated before analysis when precipitation present. However, altitude cloud top varies; weighting function peak height a channel higher than top, not affected absorption or scattering particles. Thus, radiative transfer calculation can be performed under clear sky scenario. In this...

In China, two precipitation measurement radars (PMR) have been developed and deployed on aircrafts to carry out field experiments since July 2010. As one important part, calibration using the active radar calibrator (ARC) are conducted for airborne PMRs. Then those parameters deduced from external used preprocess measurements obtain effective reflectivity factor. The results of data preprocessing also analyzed in this paper.

The Vertical Atmospheric Sounding Suits (VASS) onboard FY-3C satellite includes Infrared Sounder (IRAS), Microwave Temperature (MWTS) and moisture sounder (MWTHS-II). IRAS is similar to that FY-3A/B, while the MWTS-II/MWTHS-II more sophisticated than their precursors. MWTS has 13 channels mainly at window region 57 O2 absorption band, MWTHS 15 118 band 183 H2O band. A package been developed retrieve atmospheric temperature profile, total ozone, other parameters in both clear cloudy...

Data assimilation of satellite microwave sounders are very important for numerical weather prediction. Fengyun-3 (FY-3) polar satellites carry two such sounders: MicroWave Temperature Sounder (MWTS) and Humidity (MWHS). The observations should be quality-controlled before rain check is one the crucial steps. Microwave Radiation Imager (MWRI), on board FY-3 too, can provide useful information due to more sensitive precipitation than sounders. A remapping methodology described in this paper...

Atmospheric water vapor is an essential climate variable (ECV) with extensive spatial and temporal variations. Microwave humidity observations from meteorological satellites provide important information for system variables, including atmospheric precipitable water, assimilation in numerical weather prediction (NWP) reanalysis. As one of the payloads onboard China's second-generation polar-orbiting operational Fengyun-3 (FY-3) satellites, Humidity Sounder (MWHS) has been continuously...

To improve the assimilation accuracy of satellite microwave observations, it is necessary to conduct precipitation detection before and exclude data contaminated by scattering hydromorphic particles. The induction closely related effective radius particles, motion state particles at different scales can directly affect internal dynamic structure clouds, which will lead precipitation. further analyze validate impact in a environment on soundings within temperature-sensitive band, this article...

The Microwave Radiation Imager (MWRI) onboard the FengYun satellite plays a crucial role in global change monitoring and numerical weather prediction. Estimating correcting geolocation errors are important to retrieving accurate geophysical variables. However, instantaneous field of view (IFOV) inter-channel deviation, which is mainly caused by structure mounting error measurement feedhorns, less studied. In this present study, we constructed general theoretical model automatically estimate...

The second-generation Microwave Humidity Sounder (MWHS-2) onboard Fengyun (FY)-3C has a data quality comparable to that of counterpart microwave moisture sounders. However, channels 13 and 14 have large biases are negatively correlated with the instrument temperature prevent operational assimilation these two channels. To better understand 14, correlation observation minus simulation (O–B bias) different other factors is investigated for FY-3C MWHS-2 in this article. A sensitivity analysis...

This study characterizes the marginally-known angular-dependent polarization difference of land surface emissivity (LSE), using microwave humidity sounder (MWHS) onboard China's sun-synchronous satellite FengYun-3B (FY-3B). The instrument has two quasi-polarization channels at 150 GHz in addition to three water-vapor absorption vicinity 183 GHz, allowing observations quasi vertical and horizontal polarizations with its cross-track scanning geometry. Saharan Taklimakan deserts are taken as...

A Dual-frequency rain radar is planned In FY3(02)-E satellite, which planed to be launched in 2016. present, dual-frequency airborne (ADPR) was developed China, Field campaigns were carried out from July October 2010. To validate the instruments performance, Radar data different sources collected during field campaign, include TRMM-PR 2A21/2A25 products, car-borne X/ka band Doppler and ground weather data. Results campaign shows that, overall performance of ADPR Ku/Ka are fulfilled with...