Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849371
Huadong Ma, Haiying Zhou, Yubo Wen, P. Wang
In view of the uneven distribution of single beam measurement data density in the area with abrupt seabed terrain, it is difficult to form a refined digital water depth model to provide services for ship navigation, marine engineering construction, military activities and so on. In this paper, the area with large fluctuation of seabed topography is selected as a demonstration, and the three-dimensional interpolation methods such as linear interpolation triangulation method, nearest neighbor interpolation method and natural neighbor interpolation method are used to interpolate the single beam bathymetric data in the study area. Based on the two evaluation indexes of residual sum of squares (RSS) and root mean square errors (RMSE) and the cross validation evaluation method, the accuracy of the results of the three interpolation methods is evaluated. The final results show that when water depth interpolation is carried out in the area with large changes in seabed topography, the linear interpolation triangulation method has faster interpolation speed and the natural adjacent point interpolation method has higher interpolation accuracy. The research in this paper has practical reference value for the three-dimensional interpolation of single beam water depth data in the area with large seabed terrain changes.
{"title":"Accuracy Analysis of Interpolation Method for Abrupt Change of Seabed Water Depth","authors":"Huadong Ma, Haiying Zhou, Yubo Wen, P. Wang","doi":"10.1109/ICGMRS55602.2022.9849371","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849371","url":null,"abstract":"In view of the uneven distribution of single beam measurement data density in the area with abrupt seabed terrain, it is difficult to form a refined digital water depth model to provide services for ship navigation, marine engineering construction, military activities and so on. In this paper, the area with large fluctuation of seabed topography is selected as a demonstration, and the three-dimensional interpolation methods such as linear interpolation triangulation method, nearest neighbor interpolation method and natural neighbor interpolation method are used to interpolate the single beam bathymetric data in the study area. Based on the two evaluation indexes of residual sum of squares (RSS) and root mean square errors (RMSE) and the cross validation evaluation method, the accuracy of the results of the three interpolation methods is evaluated. The final results show that when water depth interpolation is carried out in the area with large changes in seabed topography, the linear interpolation triangulation method has faster interpolation speed and the natural adjacent point interpolation method has higher interpolation accuracy. The research in this paper has practical reference value for the three-dimensional interpolation of single beam water depth data in the area with large seabed terrain changes.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114799932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849295
Qin Zong, Kuan Tian, Qiu Zuo, Wenjing Wang
Aiming at the problem of similarity measurement of complex polygon with holes, the idea of filling holes is proposed, and complex polygon with holes are gradually filled into simple polygon. We called the graphics in the filling process are transformed graphics. Firstly, using transformed graphics constructing fuzzy matrix; Secondly, the area similarity of transformed graphics constructing matrix element value; Finally, Calculating the fuzzy equivalence relationship of the fuzzy matrix to determine the similarity of complex polygon with holes.
{"title":"A Similarity Measurement Model of Complex Polygon with Holes Based on Fuzzy Matrix and Similarity Transformation","authors":"Qin Zong, Kuan Tian, Qiu Zuo, Wenjing Wang","doi":"10.1109/ICGMRS55602.2022.9849295","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849295","url":null,"abstract":"Aiming at the problem of similarity measurement of complex polygon with holes, the idea of filling holes is proposed, and complex polygon with holes are gradually filled into simple polygon. We called the graphics in the filling process are transformed graphics. Firstly, using transformed graphics constructing fuzzy matrix; Secondly, the area similarity of transformed graphics constructing matrix element value; Finally, Calculating the fuzzy equivalence relationship of the fuzzy matrix to determine the similarity of complex polygon with holes.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117120085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849326
Miao Liu, Xitao Huang, F. Yue, Xiaorong Jia
At present, our country’s social economy is in a stage of rapid development, and the urbanization process is developing rapidly. The relationship between land use and various surface elements is getting closer and closer. Suitability research is of great significance to optimize the spatial development pattern of land and regional coordinated development. This paper selects the whole area of Tongchuan City as the research object, uses 3S technology, with the aid of ArcGIS software, uses the terrain index and distribution index model to analyze the spatial distribution characteristics of land use types in Tongchuan City, and uses the comprehensive index of land use degree. Quantitative analysis of the comprehensive intensity of types, the results are objective and true, which can provide data support and decision-making basis for the rational development of the region. The research results show that: in 2015, the types of surface resources in Tongchuan were relatively complete, and the forest land and cultivated land had obvious advantages, accounting for 59.8% and 24.9% of the city’s land area, respectively.1-5, 6-8, and 9-10 three sections, among which, the low terrain interval (1-5) covers a wide range of land use types. However, the distribution index of woodland and desert and bare land increased significantly.
{"title":"Study on suitability of distribution and spatial utilization pattern of surface resources in Tongchuan City","authors":"Miao Liu, Xitao Huang, F. Yue, Xiaorong Jia","doi":"10.1109/ICGMRS55602.2022.9849326","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849326","url":null,"abstract":"At present, our country’s social economy is in a stage of rapid development, and the urbanization process is developing rapidly. The relationship between land use and various surface elements is getting closer and closer. Suitability research is of great significance to optimize the spatial development pattern of land and regional coordinated development. This paper selects the whole area of Tongchuan City as the research object, uses 3S technology, with the aid of ArcGIS software, uses the terrain index and distribution index model to analyze the spatial distribution characteristics of land use types in Tongchuan City, and uses the comprehensive index of land use degree. Quantitative analysis of the comprehensive intensity of types, the results are objective and true, which can provide data support and decision-making basis for the rational development of the region. The research results show that: in 2015, the types of surface resources in Tongchuan were relatively complete, and the forest land and cultivated land had obvious advantages, accounting for 59.8% and 24.9% of the city’s land area, respectively.1-5, 6-8, and 9-10 three sections, among which, the low terrain interval (1-5) covers a wide range of land use types. However, the distribution index of woodland and desert and bare land increased significantly.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"688 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115834230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849265
H. Jiang, Yinfei Zhou, G. Zheng, Xiaofeng Li, B. Liu, Lizhang Zhou, Peng Chen
A tropical cyclone is a natural disaster that occurs frequently and usually brings much precipitation when it makes landfall. Tropical cyclone rainbands are an essential element in the tropical cyclone system and are often associated with tropical cyclone’s rainfall. Synthetic aperture radar (SAR) and satellite cloud images are two main observation methods to obtain tropical cyclone images. However, most previous studies focused on the satellite cloud images of tropical cyclones, and few studies on the tropical cyclones in SAR images, especially the rainbands. Therefore, in this paper, we collected SAR images containing tropical cyclone rainbands elements to observe the performance of rainbands in SAR images. Based on these data, the rainbands region in SAR images is identified and labeled by human eyes. This paper establishes a neural network data set containing tropical cyclone rainbands features to automatically extract tropical cyclone rainbands region from SAR images by using a neural network. Finally, one independent SAR image of tropical cyclones was selected for testing, and the extracted results showed great consistency with the human visual interpretation results.
{"title":"Tropical Cyclone Rainbands in SAR Images","authors":"H. Jiang, Yinfei Zhou, G. Zheng, Xiaofeng Li, B. Liu, Lizhang Zhou, Peng Chen","doi":"10.1109/ICGMRS55602.2022.9849265","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849265","url":null,"abstract":"A tropical cyclone is a natural disaster that occurs frequently and usually brings much precipitation when it makes landfall. Tropical cyclone rainbands are an essential element in the tropical cyclone system and are often associated with tropical cyclone’s rainfall. Synthetic aperture radar (SAR) and satellite cloud images are two main observation methods to obtain tropical cyclone images. However, most previous studies focused on the satellite cloud images of tropical cyclones, and few studies on the tropical cyclones in SAR images, especially the rainbands. Therefore, in this paper, we collected SAR images containing tropical cyclone rainbands elements to observe the performance of rainbands in SAR images. Based on these data, the rainbands region in SAR images is identified and labeled by human eyes. This paper establishes a neural network data set containing tropical cyclone rainbands features to automatically extract tropical cyclone rainbands region from SAR images by using a neural network. Finally, one independent SAR image of tropical cyclones was selected for testing, and the extracted results showed great consistency with the human visual interpretation results.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123109825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849252
Z. Chai, Hanhao Zhu, Z. Cui, Wei Liu, Qile Wang, Wen Wang
In order to study the influence and characteristics of seamount on low frequency acoustic propagation in shallow sea, using the Finite Element Method (FEM) to set up a full-waveguide low-frequency acoustic propagation simulation model in shallow sea, and discussing the influence laws of different seamount on acoustic propagation. The simulation results show that the propagation law of sound energy flow is obviously different from before and after the seamount. with other conditions unchanged, with the decrease of slope angle, the loss of sound energy is less in front of the seamount, and the diffusion of sound energy is slower and tends to be gentle after crossing the summit. With the decrease of the height, the less sound energy is lost in front of the seamount. As the volume of the seamount shrinks, the hindrance effect of the seamount on sound energy propagation is weakened.
{"title":"Effect of seamount on low frequency acoustic propagation characteristics in shallow sea","authors":"Z. Chai, Hanhao Zhu, Z. Cui, Wei Liu, Qile Wang, Wen Wang","doi":"10.1109/ICGMRS55602.2022.9849252","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849252","url":null,"abstract":"In order to study the influence and characteristics of seamount on low frequency acoustic propagation in shallow sea, using the Finite Element Method (FEM) to set up a full-waveguide low-frequency acoustic propagation simulation model in shallow sea, and discussing the influence laws of different seamount on acoustic propagation. The simulation results show that the propagation law of sound energy flow is obviously different from before and after the seamount. with other conditions unchanged, with the decrease of slope angle, the loss of sound energy is less in front of the seamount, and the diffusion of sound energy is slower and tends to be gentle after crossing the summit. With the decrease of the height, the less sound energy is lost in front of the seamount. As the volume of the seamount shrinks, the hindrance effect of the seamount on sound energy propagation is weakened.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123581240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849293
Xiaoman Li, Wenpo Ma, Feng Zhou
In the field of deep space exploration, remote sensors with cryogenic optics for reducing the optics radiation and increasing the remote sensing sensitivity are used for detecting celestial bodies at a long distance. A cryogenic infrared blackbody simulator working in the range of 40-300K which is continuously adjustable in front of the detector was developed, for the performance testing of the background limit detector data collection. The methods of performance parameters measurements for infrared detectors were analyzed in the paper, and the performance detection test of infrared detectors under room temperature and deep low-temperature were introduced. When in front of the cryogenic blackbody, the maximum value of integration time of the infrared detector could be 13 times longer than in front of room temperature blackbody. Meanwhile, the ratidetection rate was 15 times larger. The relationship between the working temperature of optical system and sensitivity of the system could be quantified. The result could be applied for the design of the remote sensing system.
{"title":"Study on the Performance Testing of HgCdTe Infrared Detectors in front of the Cryogenic Blackbody","authors":"Xiaoman Li, Wenpo Ma, Feng Zhou","doi":"10.1109/ICGMRS55602.2022.9849293","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849293","url":null,"abstract":"In the field of deep space exploration, remote sensors with cryogenic optics for reducing the optics radiation and increasing the remote sensing sensitivity are used for detecting celestial bodies at a long distance. A cryogenic infrared blackbody simulator working in the range of 40-300K which is continuously adjustable in front of the detector was developed, for the performance testing of the background limit detector data collection. The methods of performance parameters measurements for infrared detectors were analyzed in the paper, and the performance detection test of infrared detectors under room temperature and deep low-temperature were introduced. When in front of the cryogenic blackbody, the maximum value of integration time of the infrared detector could be 13 times longer than in front of room temperature blackbody. Meanwhile, the ratidetection rate was 15 times larger. The relationship between the working temperature of optical system and sensitivity of the system could be quantified. The result could be applied for the design of the remote sensing system.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124170798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849260
Jinming Ma, Di Lu, Gang Shi, Yanxiang Li
One of the basic tasks of remote sensing image processing is change detection (CD). It aims to determine the change information in the region of interest and filter out the irrelevant change information. Existing methods are still inadequate in terms of depth feature extraction efficiency and lack robustness to pseudo change information. To overcome this problem, a multi-attention-based CD method is proposed in this paper. The proposed method optimizes and improves the existing feature extraction network, and introduces an attention mechanism in the feature extraction process, which can better extract the image feature information. A cascaded multi-attention module is designed, which can capture both remote dependencies and spatial dependencies to obtain a higher quality feature representation. The feature extraction and detection performance of the model is improved. In addition, a serious problem in CD is sample imbalance, and to overcome this problem, a batch-balance contrastive loss function is introduced, which uses batch weights to modify the class weights of the original contrast loss. Compared with other methods, the proposed method improves the F1 scores by 5.3% and 5.6% on the three publicly available benchmark datasets CDD and LEVIR-CD datasets, respectively. The experimental results show that the proposed method achieves state-of-the-art (SOTA) CD performance.
{"title":"Remote Sensing Image Change Detection Based on Attention and Convolutional Neural Network","authors":"Jinming Ma, Di Lu, Gang Shi, Yanxiang Li","doi":"10.1109/ICGMRS55602.2022.9849260","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849260","url":null,"abstract":"One of the basic tasks of remote sensing image processing is change detection (CD). It aims to determine the change information in the region of interest and filter out the irrelevant change information. Existing methods are still inadequate in terms of depth feature extraction efficiency and lack robustness to pseudo change information. To overcome this problem, a multi-attention-based CD method is proposed in this paper. The proposed method optimizes and improves the existing feature extraction network, and introduces an attention mechanism in the feature extraction process, which can better extract the image feature information. A cascaded multi-attention module is designed, which can capture both remote dependencies and spatial dependencies to obtain a higher quality feature representation. The feature extraction and detection performance of the model is improved. In addition, a serious problem in CD is sample imbalance, and to overcome this problem, a batch-balance contrastive loss function is introduced, which uses batch weights to modify the class weights of the original contrast loss. Compared with other methods, the proposed method improves the F1 scores by 5.3% and 5.6% on the three publicly available benchmark datasets CDD and LEVIR-CD datasets, respectively. The experimental results show that the proposed method achieves state-of-the-art (SOTA) CD performance.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128664941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849319
Yaqin Liu, Yan Liu, Xian Zhu, Yanyu Chen
A localization method based on model-based processing technology is studied for wideband pulse signals in the environment with elastic seabed. Based on normal mode theory, the measurement equation is constructed using the relationship between the pressure ration of Scholte wave to normal mode and the source position. The target positioning method of model-based processing is established using the sequential Bayesian technology and particle filtering. The positioning performance of the proposed method is verified by simulation results from a shallow-water Pekeris waveguide with elastic seabed. In addition, the positioning performance of the pressure radio and vertical wave impedance as the measurement vector are simulated and analyzed respectively. Simulation results show that the source depth and the range can be correctly estimated by the two methods, and the two methods exhibit excellent positioning performance. Compared with the vertical wave impedance, the pressure radio can exhibit excellent positioning performance with less information.
{"title":"Research on Model-Based Signal Localization Processing for Waveguide with Elastic Seabed","authors":"Yaqin Liu, Yan Liu, Xian Zhu, Yanyu Chen","doi":"10.1109/ICGMRS55602.2022.9849319","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849319","url":null,"abstract":"A localization method based on model-based processing technology is studied for wideband pulse signals in the environment with elastic seabed. Based on normal mode theory, the measurement equation is constructed using the relationship between the pressure ration of Scholte wave to normal mode and the source position. The target positioning method of model-based processing is established using the sequential Bayesian technology and particle filtering. The positioning performance of the proposed method is verified by simulation results from a shallow-water Pekeris waveguide with elastic seabed. In addition, the positioning performance of the pressure radio and vertical wave impedance as the measurement vector are simulated and analyzed respectively. Simulation results show that the source depth and the range can be correctly estimated by the two methods, and the two methods exhibit excellent positioning performance. Compared with the vertical wave impedance, the pressure radio can exhibit excellent positioning performance with less information.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127109181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849351
Shihua Liu, Rui Li, Hao Chen, Ran Duan, Shengbo Geng, Yi Yang, Yongze Ju
The development of the unmanned ship technology provides a new method for Marine geological survey of the advantages of flexible can solve the traditional Marine geological survey in shoals, reefs and other regional problems can't be measured. At present, there are few researches on the application of ocean gravimetry on unmanned ship platform. This paper will focus on the ocean gravimetry on unmanned ship. Firstly, it briefly reviews the development history of unmanned ship industry, and introduces the key processing technology of unmanned ship gravimetry. Then the process of gravity measurement of unmanned ship is introduced. We have conducted two repeated measurements in a sea area of Zhuhai, and the accuracy of the repeated line and intersection measured at 5 knots and 7 knots respectively is better than the requirements of the Marine gravity survey specification. The stability and reliability of the gravity measurement system of unmanned ship are verified, which lays a foundation for the production and application of gravity measurement of unmanned ship.
{"title":"Integration and Test of Domestic Gravity Measurement System","authors":"Shihua Liu, Rui Li, Hao Chen, Ran Duan, Shengbo Geng, Yi Yang, Yongze Ju","doi":"10.1109/ICGMRS55602.2022.9849351","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849351","url":null,"abstract":"The development of the unmanned ship technology provides a new method for Marine geological survey of the advantages of flexible can solve the traditional Marine geological survey in shoals, reefs and other regional problems can't be measured. At present, there are few researches on the application of ocean gravimetry on unmanned ship platform. This paper will focus on the ocean gravimetry on unmanned ship. Firstly, it briefly reviews the development history of unmanned ship industry, and introduces the key processing technology of unmanned ship gravimetry. Then the process of gravity measurement of unmanned ship is introduced. We have conducted two repeated measurements in a sea area of Zhuhai, and the accuracy of the repeated line and intersection measured at 5 knots and 7 knots respectively is better than the requirements of the Marine gravity survey specification. The stability and reliability of the gravity measurement system of unmanned ship are verified, which lays a foundation for the production and application of gravity measurement of unmanned ship.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125357164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-22DOI: 10.1109/ICGMRS55602.2022.9849394
Jie Xu, Qingwen Zhang
To solve the ventilation tunnel pressure in the main hole with a certain slope tunnel junction produces high concentration of dust particles and harmful gas is difficult to get rid of disadvantages, based on water diversion project in yunnan Dali II period of bench mountain tunnel no. 1, on the measurements of the tunnel, first of all to modify the ventilation parameters, secondly establish three-dimensional model, USES the fluid calculation software Fluent, Through transient simulation, the standard K - $varepsilon$ turbulence model and SIMPLEC algorithm were used for numerical simulation of jet fan layout at different heights. Finally, the flow field, wind speed and wind pressure under two working conditions were compared and analyzed to obtain the optimal height of jet fan layout and corresponding ventilation characteristics of tunnel. The results show that the flow line of wind speed at the intersection of main tunnel and branch tunnel is stable but the vortex range of branch tunnel is large when the jet fan arrangement is low. When the layout is higher, the wind velocity streamline at the intersection of main tunnel and branch tunnel is disordered, and the vortex range of branch tunnel is smaller. The best flow diversion effect is achieved at 3.5m height of jet fan.
{"title":"CFD analysis of jet fan layout optimization at intersection of branch tunnel and main tunnel","authors":"Jie Xu, Qingwen Zhang","doi":"10.1109/ICGMRS55602.2022.9849394","DOIUrl":"https://doi.org/10.1109/ICGMRS55602.2022.9849394","url":null,"abstract":"To solve the ventilation tunnel pressure in the main hole with a certain slope tunnel junction produces high concentration of dust particles and harmful gas is difficult to get rid of disadvantages, based on water diversion project in yunnan Dali II period of bench mountain tunnel no. 1, on the measurements of the tunnel, first of all to modify the ventilation parameters, secondly establish three-dimensional model, USES the fluid calculation software Fluent, Through transient simulation, the standard K - $varepsilon$ turbulence model and SIMPLEC algorithm were used for numerical simulation of jet fan layout at different heights. Finally, the flow field, wind speed and wind pressure under two working conditions were compared and analyzed to obtain the optimal height of jet fan layout and corresponding ventilation characteristics of tunnel. The results show that the flow line of wind speed at the intersection of main tunnel and branch tunnel is stable but the vortex range of branch tunnel is large when the jet fan arrangement is low. When the layout is higher, the wind velocity streamline at the intersection of main tunnel and branch tunnel is disordered, and the vortex range of branch tunnel is smaller. The best flow diversion effect is achieved at 3.5m height of jet fan.","PeriodicalId":129909,"journal":{"name":"2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS)","volume":"1553 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127443917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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