红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2013年
8期
2226-2230
,共5页
卜令兵%庄一洲%徐中兵%丘祖京%邵楠清%吕敏%张强
蔔令兵%莊一洲%徐中兵%丘祖京%邵楠清%呂敏%張彊
복령병%장일주%서중병%구조경%소남청%려민%장강
微分增强法%云检测%激光云高仪
微分增彊法%雲檢測%激光雲高儀
미분증강법%운검측%격광운고의
differential enhancing method%cloud detection%laser ceilometer
激光云高仪是对大气中云的时空分布进行自动连续监测的有力工具之一,现有的云检测算法在低信噪比或有气溶胶影响时容易产生误判或漏判。文中分析了激光云高仪回波的原始信号、一阶微分信号和二阶微分信号特征,构造了两个新的信号序列,提出了一种微分增强云检测方法。该算法可以实现对云回波信号中云峰和云边界特征的增强和分离,有效修正了低信噪比和气溶胶层对云检测带来的误差。通过实验对比了微分增强法和微分零交叉法的云检测结果,结果表明:微分增强法在不影响云高判别的情况下,能有效地减少云的漏判和误判。
激光雲高儀是對大氣中雲的時空分佈進行自動連續鑑測的有力工具之一,現有的雲檢測算法在低信譟比或有氣溶膠影響時容易產生誤判或漏判。文中分析瞭激光雲高儀迴波的原始信號、一階微分信號和二階微分信號特徵,構造瞭兩箇新的信號序列,提齣瞭一種微分增彊雲檢測方法。該算法可以實現對雲迴波信號中雲峰和雲邊界特徵的增彊和分離,有效脩正瞭低信譟比和氣溶膠層對雲檢測帶來的誤差。通過實驗對比瞭微分增彊法和微分零交扠法的雲檢測結果,結果錶明:微分增彊法在不影響雲高判彆的情況下,能有效地減少雲的漏判和誤判。
격광운고의시대대기중운적시공분포진행자동련속감측적유력공구지일,현유적운검측산법재저신조비혹유기용효영향시용역산생오판혹루판。문중분석료격광운고의회파적원시신호、일계미분신호화이계미분신호특정,구조료량개신적신호서렬,제출료일충미분증강운검측방법。해산법가이실현대운회파신호중운봉화운변계특정적증강화분리,유효수정료저신조비화기용효층대운검측대래적오차。통과실험대비료미분증강법화미분령교차법적운검측결과,결과표명:미분증강법재불영향운고판별적정황하,능유효지감소운적루판화오판。
Laser ceilometer is one of the most powerful instruments to monitor the spatial and temporal distribution of cloud automatically and uninterruptedly. For the reason of algorithm, low signal-to-noise ratio and existence of aerosol layer may lead to inaccuracy during cloud observation. Based on the analyses to raw signal, differential signal and second-order differential signal, the differential enhancing method for detection of cloud was presented as well as the construction of two new signal series. The new method could realize the enhancement and separation of the signal feature of cloud peak and boundary and results in reduction of influence of low signal-to-noise ratio and existence of aerosol layer. Comparison experiments using both the differential zero-crossing method and the differential enhancing method were conducted. The results show the differential enhancing method can reduce the rates of missing judgement and misjudgement while has no influence to the judgement of cloud heights.