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In a deeply-coupled GPS/INS integrated system, the use of the inertial aiding information can improve the tracking loop performance and make the system more robust. To meet this requirement, the inertial aiding information should have sufficient accuracy in short-term (such as the sampling interval of GPS, e.g. 1sec). The MEMS (Micro-Electro Mechanical System) IMU (Inertial Measurement Unit) can be...
GPS/INS integrated systems can provide accurate and reliable navigation information using data fusing algorithm such as a Kalman filter. Current research works related to GPS/INS navigation systems mainly focused on the absolute accuracy with dominant components of mid-term and long-term errors. However, the short-term relative accuracy will be required particularly in some applications, such as POS...
This paper focuses mainly on magnesium nitrate hexahydrate and magnesium chloride hexahydrate mixture as a base phase change material (m-PCM). Sodium salt of carboxyl methyl cellulose (CMC) was added as an additive to avoid phase segregation of the mixture (c-PCM). Thermal property of the materials was characterized by DSC approach. The micro-morphology change of the materials was investigated by...
The corrosion problem of RC pipes is a commonplace in the salted soil zone, it often results in the roads' surface collapse and the houses' subsidence on the its' function, thus has the effects on building's durability and security. Through analyzing the content about soluble salt, it shows that chlorous (dle) and moderate sulfuric (sulfurous) saline soil are primary in the region. The conclusions...
The highway between Kelamayi to Yushugou lies Zhungeer alluvial plain. The diseases of the soil subgrade the route are more serious. The test result about salt content shows that moderate sulfuric (sulfurous) saline soil are primary, and chlorate (acid) feeblish. The distributed rule has been discussed about local soil, and analyzed the engineering properties of saline soil, mainly including collapsibility,...
3D building model is the important foundation of constructing virtual landscape of 3D city. This paper will focus on building models and construct buildings in small scene with existing survey data based on the secondary development of Google SketchUp. The concept of scenelite will be illustrated. The research shows that the method can effectively reduce the redundancy of repeated work in modeling...
Topological relations are research focus in 3D GIS. Constructing nodes and arcs from curves, building the topological relations of these primitives with their parent geometry and other geometries, and forming the topological graph, are the basis of the calculation of topological relationship. The formal description and smallest set of topological relationships of 3D curves are given. The line segments...
A hybrid 3D spatial data structure for the integration of aboveground, ground and underground objects based on spatial cognition theory is proposed, which considers the space subdivision and topology completeness. Object-oriented method is used to abstract objects in real world which is defined into three levels. Geometry primitives and topology primitives are defined in this data structure. Topology...
The concept and classification of the Grid-enabled Spatial Information Workflow are proposed in this paper. The workflow modeling method based on the directed graph and spatial information workflow description method on the BPEL (Business Process Execution Language) specification are proposed. The spatial information workflow running process is discussed in detail. The prototype system is developed...
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