高靈敏度、高穩(wěn)定度微波輻射計(jì)技術(shù)研究與實(shí)驗(yàn)驗(yàn)證

牛立杰; 劉浩; 吳季

doi:10.11999/JEIT161112

高靈敏度、高穩(wěn)定度微波輻射計(jì)技術(shù)研究與實(shí)驗(yàn)驗(yàn)證

doi: 10.11999/JEIT161112

2.
(中國(guó)科學(xué)院國(guó)家空間科學(xué)中心微波遙感重點(diǎn)實(shí)驗(yàn)室北京 100190) ②(中國(guó)科學(xué)院大學(xué) 北京 100049)

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出版歷程
- 收稿日期: 2016-10-20
- 修回日期: 2017-02-21
- 刊出日期: 2017-08-19

Research and Experimental Verification on High Sensitivity and High Stability Microwave Radiometer

2.
(Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China)

摘要

摘要: 使用星載綜合孔徑輻射計(jì)進(jìn)行海洋鹽度探測(cè)是微波遙感領(lǐng)域的一個(gè)研究熱點(diǎn)。為了達(dá)到海洋鹽度探測(cè)所需準(zhǔn)確度指標(biāo)，綜合孔徑輻射計(jì)的輻射計(jì)單元需要同時(shí)具有非常高的靈敏度及定標(biāo)穩(wěn)定度。該文研究了一種兼顧高靈敏度和高穩(wěn)定度的輻射計(jì)技術(shù)，通過(guò)實(shí)時(shí)定標(biāo)的方法保證穩(wěn)定度指標(biāo)，通過(guò)定標(biāo)數(shù)據(jù)平均的方法提高靈敏度指標(biāo)。首次通過(guò)頻域分析得到最優(yōu)定標(biāo)數(shù)據(jù)平均時(shí)間。完成了長(zhǎng)時(shí)間穩(wěn)定度實(shí)驗(yàn)，實(shí)驗(yàn)結(jié)果表明：該輻射計(jì)穩(wěn)定度在3天(3 d)內(nèi)優(yōu)于0.12 K，靈敏度優(yōu)于0.1 K，達(dá)到了海洋鹽度探測(cè)綜合孔徑輻射計(jì)對(duì)輻射計(jì)單元的需求。
- 高穩(wěn)定度輻射計(jì) /
- L波段微波輻射計(jì) /
- 噪聲注入式輻射計(jì) /
- 海洋鹽度
Abstract: Global measurement of ocean salinity using satellite borne synthetic aperture radiometer is one of the research focuses in the field of microwave remote sensing. In order to achieve the accuracy of the ocean salinity detection, the radiometer units of the synthetic aperture radiometer need to have very high sensitivity and very high calibration stability. In this paper, the technique of the radiometer with high sensitivity and high stability is researched. High stability is realized by the real-time calibration method, and the sensitivity is effectively improved by the calibration data average technology. The optimal average time is obtained by the frequency domain analysis for the first time. Long time stability experiments are completed to demonstrate its performance. Experimental results show that the stability of this L-band radiometer reaches 0.12 K (in 3 days), and the sensitivity reaches 0.1 K, which can reach the requirement of the synthetic aperture radiometer for ocean salinity detection.
- High stability radiometer /
- L-band microwave radiometer /
- Noise injection radiometer /
- Ocean salinity

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參考文獻(xiàn)(19)

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