激光技术
激光技術
격광기술
LASER TECHNOLOGY
2015年
1期
6-12
,共7页
王元庆%何炬%马泳%余寅%张念%梁琨
王元慶%何炬%馬泳%餘寅%張唸%樑琨
왕원경%하거%마영%여인%장념%량곤
激光技术%海洋布里渊散射%随机噪声%频移%线宽%温度%测量误差
激光技術%海洋佈裏淵散射%隨機譟聲%頻移%線寬%溫度%測量誤差
격광기술%해양포리연산사%수궤조성%빈이%선관%온도%측량오차
laser technique%oceanic Brillouin scattering%random noise%frequency shift%linewidth%temperature%measurement error
为了分析激光雷达系统中随机噪声对海水布里渊散射谱以及温度反演精度的影响,依据布里渊散射理论及系统噪声特性,对带噪布里渊散射频谱进行了理论分析,并进行了信噪比从1dB~100dB的仿真实验。结果表明,当信噪比大于16 dB时,频移和线宽的平均误差和不确定度能够控制在兆赫兹量级,温度误差和不确定度能够控制在0.2℃以内;采用实际应用中多次测量取平均的方法,10次平均能够保证0.2℃的测量精度对信噪比的要求下降到7 dB。这为激光雷达在海水高精度遥感提供了指导。
為瞭分析激光雷達繫統中隨機譟聲對海水佈裏淵散射譜以及溫度反縯精度的影響,依據佈裏淵散射理論及繫統譟聲特性,對帶譟佈裏淵散射頻譜進行瞭理論分析,併進行瞭信譟比從1dB~100dB的倣真實驗。結果錶明,噹信譟比大于16 dB時,頻移和線寬的平均誤差和不確定度能夠控製在兆赫玆量級,溫度誤差和不確定度能夠控製在0.2℃以內;採用實際應用中多次測量取平均的方法,10次平均能夠保證0.2℃的測量精度對信譟比的要求下降到7 dB。這為激光雷達在海水高精度遙感提供瞭指導。
위료분석격광뢰체계통중수궤조성대해수포리연산사보이급온도반연정도적영향,의거포리연산사이론급계통조성특성,대대조포리연산사빈보진행료이론분석,병진행료신조비종1dB~100dB적방진실험。결과표명,당신조비대우16 dB시,빈이화선관적평균오차화불학정도능구공제재조혁자량급,온도오차화불학정도능구공제재0.2℃이내;채용실제응용중다차측량취평균적방법,10차평균능구보증0.2℃적측량정도대신조비적요구하강도7 dB。저위격광뢰체재해수고정도요감제공료지도。
In order to analyze effect of random noise of lidar system on oceanic Brillouin scattering spectroscopy and temperature inversion precision, Brillouin scattering spectrum with noise was analyzed theoretically based on Brillouin scattering theory and system noise characteristics.Simulation experiment of signal-to-noise ratio ( SNR) from 1dB to 100dB was conducted.The results showed that average error and uncertainty of frequency shift and linewidth can be controlled to the order of MHz when SNR is greater than 16dB.Temperature error and uncertainty can be controlled within 0.2℃.In actual application, the average of multiple measurements is taken.The average of 10 times can ensure the requirement of SNR is smaller than 7dB with measurement accuracy of 0.2℃.The study provides the guidance for lidar remote sensing precision in seawater.