Journal of Surveying Engineering最新文献_第7页

The ADOP and PDOP: Two Complementary Diagnostics for GNSS Positioning ADOP和PDOP: GNSS定位的两种互补诊断

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2020-05-01 DOI: 10.1061/(asce)su.1943-5428.0000313

Kan Wang, P. Teunissen, A. el-Mowafy

{"title":"The ADOP and PDOP: Two Complementary Diagnostics for GNSS Positioning","authors":"Kan Wang, P. Teunissen, A. el-Mowafy","doi":"10.1061/(asce)su.1943-5428.0000313","DOIUrl":"https://doi.org/10.1061/(asce)su.1943-5428.0000313","url":null,"abstract":"Ambiguity dilution of precision (ADOP) and position dilution of precision (PDOP) are two popular scalar-diagnostics used in Global Navigation Satellite System (GNSS) positioning. Where the ADOP is a predictor for carrier-phase ambiguity resolution performance, the PDOP is meant to predict the receiver-satellite geometry's capability for precise positioning. We will show, however, that although the PDOP works well for code-based positioning, one has to exercise great care in using the PDOP for real-time kinematic (RTK) positioning. We show that the ADOP and PDOP have distinct behaviors, an important consequence of which is that one can have time periods with small PDOPs, and thus seemingly good geometry for precise positioning, but at the same time large ADOPs, thus showing that successful ambiguity resolution and therefore precise positioning will not be possible. Also, the reverse situation may occur, i.e., having large PDOPs with small ADOPs. In such a situation, the large PDOPs should not automatically lead to the conclusion of poor position performance, because the large gain that ambiguity resolution brings will often still make precise positioning possible. We will analyze and explain this complementary behavior of the PDOP and ADOP and demonstrate this both analytically and empirically. For this analysis we use real Global Positioning System (GPS) single- and multifrequency signals and GPS/Quasi-Zenith Satellite System (QZSS), GPS/Navigation with Indian Constellation (NAVIC) L5 signals of two baselines located in Perth, Australia.","PeriodicalId":54366,"journal":{"name":"Journal of Surveying Engineering","volume":"63 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91002222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Improving Data Acquisition Efficiency: Systematic Accuracy Evaluation of GNSS-Assisted Aerial Triangulation in UAS Operations 提高数据获取效率:无人机操作中gnss辅助空中三角测量的系统精度评估

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2020-02-01 DOI: 10.1061/(asce)su.1943-5428.0000298

Adam R. Benjamin, Dennis R. O'Brien, G. Barnes, B. Wilkinson, W. Volkmann

引用次数: 9

Accuracy Assessment of DEMs in Different Topographic Complexity Based on an Optimum Number of GCP Formulation and Error Propagation Analysis 基于GCP公式最优数和误差传播分析的DEM在不同地形复杂度下的精度评估

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2020-02-01 DOI: 10.1061/(asce)su.1943-5428.0000296

S. Nadi, D. Shojaei, Y. Ghiasi

引用次数: 7

Four Methods for Low-Distortion Projections 低失真投影的四种方法

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(asce)su.1943-5428.0000295

C. M. Rollins, T. H. Meyer

引用次数: 1

Virtual Observation Method and Precision Estimation for Ill-Posed Partial EIV Model 病态部分EIV模型的虚拟观测方法及精度估计

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000282

Leyang Wang, Guisen Wen, Yingwen Zhao

引用次数: 7

Unified Least-Squares Formulation of a Linear Model with Hard Constraints 具有硬约束的线性模型的统一最小二乘公式

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000290

A. Amiri-Simkooei

引用次数: 0

Performance Assessment of BDS Real-Time Precise Point Positioning Based on SSR Corrections 基于SSR修正的BDS实时精确点定位性能评估

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000281

Yishuai Shi, Jinming Hao, Weiping Liu, Bo Jiao, Hui Zhang, Baofeng Song

引用次数: 7

Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study 使用备选方案确定水深图的最浅深度:案例研究

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000278

T. H. Mohammadloo, M. Snellen, D. Simons, B. Dierikx, S. Bicknese

{"title":"Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study","authors":"T. H. Mohammadloo, M. Snellen, D. Simons, B. Dierikx, S. Bicknese","doi":"10.1061/(ASCE)SU.1943-5428.0000278","DOIUrl":"https://doi.org/10.1061/(ASCE)SU.1943-5428.0000278","url":null,"abstract":"Methods for gridding multibeam echo sounder (MBES) measurements to equidistant grids are proposed as alternatives to the shallowest measured depth, which is affected by outliers. The approaches considered use a combination of mean and standard deviation of soundings and the regression coefficient from the best fitted plane. These methods along with mean and shallowest depths were applied to two surveyed areas. Two issues were found to be of importance, that is, a proper distribution of soundings and low uncertainties in the depth measurements. Improper sampling excludes using the method employing regression coefficients. For flat areas, the shallowest measured depth was found to be highly influenced by measurement uncertainties, counteracted when using the mean depth. However, the mean depth underestimates the shallowest depth for areas with slopes. When correcting the mean depth for standard deviation, the effect of slopes is accounted for while the influence of measurement uncertainties is decreased compared to shallowest measured depth. Since the uncertainties are dependent on beam angle, depth, and measurement equipment, these issues need to be accounted for in survey planning.","PeriodicalId":54366,"journal":{"name":"Journal of Surveying Engineering","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)SU.1943-5428.0000278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47101481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Potentially Misleading GPS Leveling–Based Assessment of Gravimetric Geoid or Quasigeoid Models due to Vertical Land Motion and Different GPS Processing Software 由于垂直地面运动和不同的GPS处理软件，基于重力大地水准或准大地水准模型的潜在误导GPS水准评估

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(asce)su.1943-5428.0000293

W. Featherstone, T. Lyon, J. McCubbine

引用次数: 4

Characteristic Analysis of 3D Outlier Detection Method for GNSS Network Adjustments GNSS网络平差三维离群点检测方法特征分析

IF 1.9 3区工程技术

Journal of Surveying Engineering Pub Date : 2019-11-01 DOI: 10.1061/(asce)su.1943-5428.0000292

Ling Yang, Yufeng Nie, Yunzhong Shen

引用次数: 2