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The concept of Precise Point Positioning (PPP) for Global Navigation Satellite System (GNSS) technology was introduced in 1976, however it took until the 1990s for PPP to generate interest amongst the greater GNSS community. In order to evaluate the performance of PPP and its uses for CORSs Network definition, data collected from geodetic receivers belonging to permanent stations of Nigeria network...
The current traditional system of paper documents adopted by Fire Department had lead to the inability of the fire fighters to locate usable and functioning hydrants in an efficient and effective manner which can jeopardize any rescue mission. Hence, there is a need to revised the Fire Department current system and develop a new system that is much more easier, portable and also time and cost effective...
Most of the landslide and flood prediction models require the Digital elevation Model (DEM) as the input. DEM is the digital representation of topographic and manmade features located on the surface of the earth. DEM also needed in hydrologic analyses, resource management and environmental assessment and including interferometry synthetic aperture radar (InSAR) applications. The increased use of DEM...
The accuracy of COSMO-SkyMed DEMs is investigated using StripMap mode images, acquired during the interferometric Tandem-Like mission characterized by a temporal baseline of 24 hours and spatial baselines maintained around 150–200 m. Some Couples of both Ascending and Descending interferometric pairs, acquired on selected test sites located in the California have been processed using the open source...
Digital Elevation Model (DEM) is a numerical representation of topography and is made up of equal-sized grid cells, each with a value of elevation. The DEMs that were generated from the spot heights by general interpolation techniques namely Inverse Distance Weighted (IDW), Kriging, Topo to Raster, Natural Neighbor (NN) and Spline approaches have been compared. The relative performance of each method...
This project developed a new application platform software system to support automatically ITS facility's location decision-making system. The system, called PEDS (Platform for displacement Expert Design System), is in harmony with GIS, GPS and Artificial Intelligence Software to make design the position of ITS road facilities, automatically. We define the reference architecture for merging the heterogeneous...
The advancement in digital photogrammetry has made photogrammetric technique become simpler, faster and lower cost. This method is popular in covering large and small area. This paper discusses about the experience of processing a strip of large format aerial photographs and two strips of small format aerial photographs using different digital photogrammetric software. The study area covered is the...
With the further development of GPS and rising of new positioning system, the ground coverage rate has become a hot research object. As a mature software, STK can solve aerospace problem rapidly and accurately. The paper innovatively uses STK software to measure the coverage rate of GPS. After giving the previous result, the paper propounds a further discussion of coverage rate: the level of accuracy...
The objective of this study is to develop new glacial lake inventory to understand existing condition using the optical imageries of the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) and the Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2) onboard the Advanced Land Observing Satellite (ALOS, nicknamed “Daichi”). Glacial lakes can be caused outburst flood when natural...
Differential Global Navigation Satellite Systems (DGNSS) are a commonly applied technique for safety critical (Safety-of-Life) navigational operations. Since the nineties an augmentation system following the IALA Beacon DGNSS standard has been employed in the maritime sector. As main components the system comprises a reference station and an integrity monitoring station. With the help of the reference...
In recent years, GPS chipset technologies have been changed completely in order to allow for positioning under extreme conditions, such as in indoor environments. The necessity of always having a positioning capability is rising, but what accuracy level can be reached? Some specific tests have been carried out to estimate the limits for indoor positioning. It has also been evaluated whether this technique...
As a new photogrammetry sensor, ADS40 still has no large-scale applications in our country. The low automatic degree and security classification are the main problems when handling data on the local coordinate system in the current production process. The automatic post-process method is put forward, which can remarkably simplify the data process flow, improve the data production efficiency and enhance...
Based on the idea that severs for the underwater topographic survey, this paper presents the development of hydrographic datum transformation software. Two key technologies, the plane datum conversion and the vertical datum conversion, are studied firstly. Then the design thought of the software, features, structure and operation model are depicted in detail. Finally, the software performance is tested...
Abstract-At present, the problems of the coordinate conversion in vehicle navigation, target location and guidance have become increasingly striking. Because GPS adopts the WGS-84(World Geodetic System 84) coordinate system, while various types of electronic maps usually adopt the BJ-54 coordinate system(Beijing Geodetic Coordinate System l954), in China, we must convert the coordinate system so as...
The Institute of Navigation and Satellite Geodesy of the Graz University of Technology is involved in many projects and developments to determine GNSS-based trajectories for demanding applications. Examples demonstrating the capabilities and limits of GNSS-based positioning under detrimental conditions are: positioning and guidance of visually impaired pedestrians, search and rescue applications,...
In this paper, a vector delay lock loop (VDLL) which is utilizing navigation results to track code signals is designed in a software GPS receiver. And the performance of it is analyzed in a point of tracking accuracy and compared with that of scalar delay lock loop (SDLL). Moreover the analyzed performance of VDLL is also confirmed by experiments. Finally, the performance of VDLL can be expected for...
There has been interest in recent years in backup systems in case of the loss of GPS in South Korea. The Ministry of Maritime Affairs and Fisheries had conducted the feasibility study using DGPS beacon signal and recently Ministry of Land, Transport and Maritime Affairs started to examine eLoran (enhanced Loran) system, especially in the harbor entrance and approach (HEA). In order to meet this HEA...
Instantaneous frequency and time-delay measured accurately are important technologies for high precise underwater positioning. In order to prevent the leakage interference from other frequency channels, variability of instantaneous frequency sequence (VIFS) calculation and frequency estimations were adopted. The synchronous positioning model (spherical) combined with asynchronously model (hyperbolical)...
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