FY-3G MWRI-RM低頻通道亮溫觀測中的無線電干擾信號及其日變化

doi:10.12306/2024jms.0030

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FY-3G MWRI-RM低頻通道亮溫觀測中的無線電干擾信號及其日變化
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                        10.12306/2024jms.0030
                    
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中圖分類號:P407
基金項目:國家重點研發(fā)計劃資助項目(2018YFC1507004)

Diurnal variations of radio-frequency interference signal detected from FY-3G Microwave Radiation Imager-Rainfall Mission

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由于微波輻射計低頻通道的非保護(hù)性,亮溫觀測會受到主動傳感器的信號污染,被稱為無線電頻率干擾(Radio-Frequency Interference, RFI)。RFI信號降低了亮溫觀測資料及其反演產(chǎn)品的準(zhǔn)確度。我國近期發(fā)射的風(fēng)云三號G星(FY-3G)搭載了微波成像儀—降水型(Microwave Radiation Imager-Rainfall Mission, MWRI-RM),在10.65~183.00 GHz的頻率范圍內(nèi)設(shè)有17個通道,對地球大氣進(jìn)行被動遙感探測。在沒有RFI影響情況下,不同通道亮溫觀測具有高度相關(guān)性。利用這一特點,采用標(biāo)準(zhǔn)化主成分分析法,可識別FY-3G MWRI-RM亮溫觀測資料中RFI的發(fā)生位置和強度。與風(fēng)云三號A/B/C/D/星(FY-3A/B/C/D)不同,FY-3G MWRI-RM可以在不同時間觀測到地球同一地點。因此,還可以研究RFI是否有日變化特征。結(jié)果表明,RFI信號確實存在于MWRI-RM的低頻通道10.65 GHz亮溫觀測資料中,在中國和歐洲都有集中或零散分布區(qū)域,并且呈現(xiàn)日變化特征,RFI強度在白天普遍大于夜間。

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Due to unprotected low-frequency microwave channels, brightness temperature observations are susceptible to signal contamination from active sensors, referred to as Radio-Frequency Interference (RFI). RFI signals reduce the accuracy of brightness temperature observations and their retrieval products. The Fengyun-3G satellite (FY-3G), recently launched by China, is equipped with a Microwave Radiation Imager-Rainfall Mission (MWRI-RM). MWRI-RM has 17 channels located in the frequency range from 10.65 to 183.00 GHz to enable passive remote sensing of Earth's atmosphere. Exploiting high correlations of brightness temperature among channels if no RFI, a normalized principal component analysis method was employed to detect RFI signals in FY-3G MWRI-RM brightness temperature observations. Unlike FY-3A/B/C/D, FY-3G MWRI-RM can observe the same location on Earth at different times, allowing for an investigation of diurnal variations in RFI. Results indicate that RFI signals do exist in MWRI-RM observations of brightness temperature at 10.65 GHz, with concentrated and scattered distributions in both China and Europe. Moreover, RFI signals indeed exhibit a diurnal variation, with higher intensity during daytime than nighttime.

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史震源,鄒曉蕾. FY-3G MWRI-RM低頻通道亮溫觀測中的無線電干擾信號及其日變化.氣象科學(xué),2024,44(4):691-706 SHI Zhenyuan, ZOU Xiaolei. Diurnal variations of radio-frequency interference signal detected from FY-3G Microwave Radiation Imager-Rainfall Mission. Journal of the Meteorological Sciences,2024,44(4):691-706

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收稿日期:2024-03-12
最后修改日期:2024-04-12
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在線發(fā)布日期: 2024-09-23
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