With the development of ultra-wide coverage technology,multibeam echo-sounder(MBES)system has put forward higher requirements for localization accuracy and computational efficiency of ray tracing method.The classical ...With the development of ultra-wide coverage technology,multibeam echo-sounder(MBES)system has put forward higher requirements for localization accuracy and computational efficiency of ray tracing method.The classical equivalent sound speed profile(ESSP)method replaces the measured sound velocity profile(SVP)with a simple constant gradient SVP,reducing the computational workload of beam positioning.However,in deep-sea environment,the depth measurement error of this method rapidly increases from the central beam to the edge beam.By analyzing the positioning error of the ESSP method at edge beam,it is discovered that the positioning error increases monotonically with the incident angle,and the relationship between them could be expressed by polynomial function.Therefore,an error correction algorithm based on polynomial fitting is obtained.The simulation experiment conducted on an inclined seafloor shows that the proposed algorithm exhibits comparable efficiency to the original ESSP method,while significantly improving bathymetry accuracy by nearly eight times in the edge beam.展开更多
为准确预测邯郸市工业需水量,结合残差修正GM(1,1)模型与等维递补原理,建立等维递补残差修正GM(1,1)模型,对邯郸市各区域2025年工业需水量进行预测。在此基础上,依据河北省水利厅下发的2025年邯郸市万元工业增加值用水量指标计算工业节...为准确预测邯郸市工业需水量,结合残差修正GM(1,1)模型与等维递补原理,建立等维递补残差修正GM(1,1)模型,对邯郸市各区域2025年工业需水量进行预测。在此基础上,依据河北省水利厅下发的2025年邯郸市万元工业增加值用水量指标计算工业节水修正值,并用以修正预测值。结果表明,等维递补残差修正GM(1,1)模型较GM(1,1)模型与残差修正GM(1,1)模型而言,相对误差分别减少了33.9%与12.5%,将节水修正值用以修正模型预测结果,相对误差进一步减少4.0%,更加适用于邯郸市工业需水量预测。结合模型求解结果与节水修正值,得2025年邯郸市工业需水量为34799.90×10^(4) m ^(3),为邯郸市工业的可持续发展提供参考,也为其他区域需水量预测提供借鉴意义。展开更多
基金The Natural Science Foundation of Shandong Province of China under contract Nos ZR2022MA051 and ZR2020MA090the National Natural Science Foundation of China under contract No.U22A2012+2 种基金China Postdoctoral Science Foundation under contract No.2020M670891the SDUST Research Fund under contract No.2019TDJH103the Talent Introduction Plan for Youth Innovation Team in universities of Shandong Province(innovation team of satellite positioning and navigation)。
文摘With the development of ultra-wide coverage technology,multibeam echo-sounder(MBES)system has put forward higher requirements for localization accuracy and computational efficiency of ray tracing method.The classical equivalent sound speed profile(ESSP)method replaces the measured sound velocity profile(SVP)with a simple constant gradient SVP,reducing the computational workload of beam positioning.However,in deep-sea environment,the depth measurement error of this method rapidly increases from the central beam to the edge beam.By analyzing the positioning error of the ESSP method at edge beam,it is discovered that the positioning error increases monotonically with the incident angle,and the relationship between them could be expressed by polynomial function.Therefore,an error correction algorithm based on polynomial fitting is obtained.The simulation experiment conducted on an inclined seafloor shows that the proposed algorithm exhibits comparable efficiency to the original ESSP method,while significantly improving bathymetry accuracy by nearly eight times in the edge beam.
文摘为准确预测邯郸市工业需水量,结合残差修正GM(1,1)模型与等维递补原理,建立等维递补残差修正GM(1,1)模型,对邯郸市各区域2025年工业需水量进行预测。在此基础上,依据河北省水利厅下发的2025年邯郸市万元工业增加值用水量指标计算工业节水修正值,并用以修正预测值。结果表明,等维递补残差修正GM(1,1)模型较GM(1,1)模型与残差修正GM(1,1)模型而言,相对误差分别减少了33.9%与12.5%,将节水修正值用以修正模型预测结果,相对误差进一步减少4.0%,更加适用于邯郸市工业需水量预测。结合模型求解结果与节水修正值,得2025年邯郸市工业需水量为34799.90×10^(4) m ^(3),为邯郸市工业的可持续发展提供参考,也为其他区域需水量预测提供借鉴意义。
