scholarly journals Prospects of Metrological Provision Linear Geodetic of Measurements on the Geodetic Test Field

2013 ◽  
Vol 94 (1) ◽  
pp. 56-63
Author(s):  
Trevoho I.S. ◽  
Tsyupak I.M.
Keyword(s):  
Metrological Support ◽  
Metrological Provision ◽  
Geodetic Network ◽  
Test Field ◽  
Gnss Receivers ◽  
Standard Linear ◽  
Working Standards

Abstract This paper gives brief information on existing metrological support for the Yavoriv of scientific of the geodetic of test field (SGTF) for testing of modern of surveying equipment (rangefinders, electronic total stations and GNSS receivers). Analyzed ways to improve the fundamental geodetic network and the standard linear of basis, as working standards for testing, in accordance, GNSS receivers and a rangefinders, as well as for study an accuracy technology of GNSS leveling.

scholarly journals SLR and GNSS Test Field for Global Geodetic Network Assessment in Riga

2020 ◽  
Author(s):  
Janis Kaminskis ◽  
Lubova Sulakova ◽  
Kalvis Salmins ◽  
Janis Kaulins ◽  
Lauris Goldbergs
Keyword(s):  
Geodetic Network ◽  
Point Of View ◽  
Global Perspective ◽  
Test Field ◽  
Term Change ◽  
Space Objects ◽  
Exact Position ◽  
Preparatory Work ◽  
Scientific Achievements

The basic aim is to contribute to the world geodetic space in line with today’s scientific achievements. Riga geodynamic site is a thankful place for this, as it has long-term SLR observations and the longest GNSS records in Latvia. The goal is establishment of regional long-term geodetic monitoring station at LU Institute of Astronomy, Riga, Kandavas street 2, by joining at least two space geodetic technologies – the already installed laser-telescope LS-105 and GNSS − collocated, but not sufficiently linked. The capability of geodetic GNSS observations would uniquely complement Riga GNSS station and allow to determine more accurate coordinates of the LS-105 laser telescope and the long-term changes needed to accurately measure the positions of Earth satellites and other similar space objects. GNSS Observation Station will contribute to the development of positioning and position long-term change to accuracy of less than 1mm, one of the current global goals of GGOS. We plan to solve the problem with the exact position of the telescope LS-105 it will contribute to the development of scientific research and applied potential of the LU Satellite Laser Ranging station. From the national point of view geodetic station serves as an important point for Latvian National Geodetic Network, long term large infrastructure planning, engineering communications, cartography, etc. From a global perspective the station will be one of very few such stations in the region and the only one in the Baltics capable of valuable contribution to ITRF network. Preparatory work for the study has started by selecting and consolidating geodetic points for further measurements.

scholarly journals ACCURACY ASSESSMENT OF MOBILE MAPPING POINT CLOUDS USING THE EXISTING ENVIRONMENT AS TERRESTRIAL REFERENCE

2016 ◽  
Vol XLI-B1 ◽  
pp. 601-608 ◽  
Author(s):  
S. Hofmann ◽  
C. Brenner
Keyword(s):  
Point Cloud ◽  
Reference Data ◽  
Geodetic Network ◽  
Point Clouds ◽  
Test Field ◽  
Mobile Mapping ◽  
Total Station ◽  
Processed Products ◽  
Mapping Point

Mobile mapping data is widely used in various applications, what makes it especially important for data users to get a statistically verified quality statement on the geometric accuracy of the acquired point clouds or its processed products. The accuracy of point clouds can be divided into an absolute and a relative quality, where the absolute quality describes the position of the point cloud in a world coordinate system such as WGS84 or UTM, whereas the relative accuracy describes the accuracy within the point cloud itself. Furthermore, the quality of processed products such as segmented features depends on the global accuracy of the point cloud but mainly on the quality of the processing steps. Several data sources with different characteristics and quality can be thought of as potential reference data, such as cadastral maps, orthophoto, artificial control objects or terrestrial surveys using a total station. In this work a test field in a selected residential area was acquired as reference data in a terrestrial survey using a total station. In order to reach high accuracy the stationing of the total station was based on a newly made geodetic network with a local accuracy of less than 3 mm. The global position of the network was determined using a long time GNSS survey reaching an accuracy of 8 mm. Based on this geodetic network a 3D test field with facades and street profiles was measured with a total station, each point with a two-dimensional position and altitude. In addition, the surface of poles of street lights, traffic signs and trees was acquired using the scanning mode of the total station. <br><br> Comparing this reference data to the acquired mobile mapping point clouds of several measurement campaigns a detailed quality statement on the accuracy of the point cloud data is made. Additionally, the advantages and disadvantages of the described reference data source concerning availability, cost, accuracy and applicability are discussed.

scholarly journals ACCURACY ASSESSMENT OF MOBILE MAPPING POINT CLOUDS USING THE EXISTING ENVIRONMENT AS TERRESTRIAL REFERENCE

2016 ◽  
Vol XLI-B1 ◽  
pp. 601-608
Author(s):  
S. Hofmann ◽  
C. Brenner
Keyword(s):  
Point Cloud ◽  
Reference Data ◽  
Geodetic Network ◽  
Point Clouds ◽  
Test Field ◽  
Mobile Mapping ◽  
Total Station ◽  
Processed Products ◽  
Mapping Point

Mobile mapping data is widely used in various applications, what makes it especially important for data users to get a statistically verified quality statement on the geometric accuracy of the acquired point clouds or its processed products. The accuracy of point clouds can be divided into an absolute and a relative quality, where the absolute quality describes the position of the point cloud in a world coordinate system such as WGS84 or UTM, whereas the relative accuracy describes the accuracy within the point cloud itself. Furthermore, the quality of processed products such as segmented features depends on the global accuracy of the point cloud but mainly on the quality of the processing steps. Several data sources with different characteristics and quality can be thought of as potential reference data, such as cadastral maps, orthophoto, artificial control objects or terrestrial surveys using a total station. In this work a test field in a selected residential area was acquired as reference data in a terrestrial survey using a total station. In order to reach high accuracy the stationing of the total station was based on a newly made geodetic network with a local accuracy of less than 3 mm. The global position of the network was determined using a long time GNSS survey reaching an accuracy of 8 mm. Based on this geodetic network a 3D test field with facades and street profiles was measured with a total station, each point with a two-dimensional position and altitude. In addition, the surface of poles of street lights, traffic signs and trees was acquired using the scanning mode of the total station. <br><br> Comparing this reference data to the acquired mobile mapping point clouds of several measurement campaigns a detailed quality statement on the accuracy of the point cloud data is made. Additionally, the advantages and disadvantages of the described reference data source concerning availability, cost, accuracy and applicability are discussed.

scholarly journals Kinematic GPR-TPS Model for Infrastructure Asset Identification with High 3D Georeference Accuracy Developed in a Real Urban Test Field

2019 ◽  
Vol 11 (12) ◽  
pp. 1457 ◽  
Author(s):  
Nikolaj Šarlah ◽  
Tomaž Podobnikar ◽  
Domen Mongus ◽  
Tomaž Ambrožič ◽  
Branko Mušič
Keyword(s):  
Mean Squared Error ◽  
Geodetic Network ◽  
Field Testing ◽  
Controlled Environment ◽  
Second Phase ◽  
Test Field ◽  
Starting Point ◽  
Fidelity Measures ◽  
Ground Penetrating ◽  
Geodetic Surveying

This paper describes in detail the development of a ground-penetrating radar (GPR) model for the acquisition, processing and visualisation of underground utility infrastructure (UUI) in a controlled environment. The initiative was to simulate a subsurface urban environment through the construction of regional road, local road and pedestrian pavement in real urban field/testing pools (RUTPs). The RUTPs represented a controlled environment in which the most commonly used utilities were installed. The accuracy of the proposed kinematic GPR-TPS (terrestrial positioning system) model was analysed using all the available data about the materials, whilst taking into account the thickness of the pavement as well as the materials, dimensions and 3D position of the UUI as given reference values. To determine the reference 3D position of the UUI, a terrestrial geodetic surveying method based on the established positional and height geodetic network was used. In the first phase of the model, the geodetic network was used as a starting point for determining the 3D position of the GPR antenna with the efficient kinematic GPR surveying setup using a GPR and self-tracking (robotic) TPS. In the second phase, GPR-TPS system latency was quantified by matching radargram pairs with a set of fidelity measures based on a correlation coefficient and mean squared error. This was followed by the most important phase, where, by combining sets of “standard” processing routines of GPR signals with the support of advanced algorithms for signal processing, UUI were interpreted and visualised semi-automatically. As demonstrated by the results, the proposed GPR model with a kinematic GPR-TPS surveying setup for data acquisition is capable of achieving an accuracy of less than ten centimetres.

scholarly journals Testing the Performance of Multi-Frequency Low-Cost GNSS Receivers and Antennas

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2029
Author(s):  
Veton Hamza ◽  
Bojan Stopar ◽  
Oskar Sterle
Keyword(s):  
Low Cost ◽  
Geodetic Network ◽  
Satellite System ◽  
Low Noise ◽  
Short Baseline ◽  
True Value ◽  
Gnss Receivers ◽  
Baseline Test ◽  
The Difference ◽  
The Impact

Global Navigation Satellite System (GNSS) low-cost multi-frequency receivers are argued as an alternative to geodetic receivers for many applications. Calibrated low-cost antennas recently became available on the market making low-cost instruments more comparable with geodetic ones. The main goal of this research was to evaluate the noise of low-cost GNSS receivers, to compare the positioning quality from different types of low-cost antennas, and to analyze the positioning differences between low-cost and geodetic instruments. The results from a zero baseline test indicated that the u-blox multi-frequency receiver, namely, ZED-F9P, had low noise that was at the sub-millimeter level. To analyze the impact of the antennas in the obtained coordinates, a short baseline test was applied. Both tested uncalibrated antennas (Tallysman TW3882 and Survey) demonstrated satisfactory positioning performance. The Tallysman antenna was more accurate in the horizontal position determination, and the difference from the true value was only 0.1 mm; while, for the Survey antenna, the difference was 1.0 mm. For the ellipsoid height, the differences were 0.3 and 0.6 mm for the Survey and Tallysman antennas, respectively. The comparison of low-cost receivers with calibrated low-cost antennas (Survey Calibrated) and geodetic instruments proved better performance for the latter. The geodetic GNSS instruments were more accurate than the low-cost instruments, and the precision of the estimated coordinates from the geodetic network was also greater. Low-cost GNSS instruments were not at the same level as the geodetic ones; however, considering their cost, they demonstrated excellent performance that is sufficiently appropriate for various geodetic applications.

scholarly journals An Approach to Improving GNSS Positioning Accuracy Using Several GNSS Devices

2021 ◽  
Vol 13 (6) ◽  
pp. 1149
Author(s):  
María Jesús Jiménez-Martínez ◽  
Mercedes Farjas-Abadia ◽  
Nieves Quesada-Olmo
Keyword(s):  
Empirical Test ◽  
Low Cost ◽  
Single Point ◽  
Geodetic Network ◽  
Geometric Conditions ◽  
Data Segmentation ◽  
Gnss Receivers ◽  
Recorded Data ◽  
Tracking Time ◽  
Time Required

Single point positioning (SPP) mode, related to pseudorange measurements, limits the level of accuracy to several meters in open sky and to several dozens of meters in urban canyons. This paper explores the effect of using a large number of SPP observations from low-cost global navigation system (GNSS) receivers, smartphones, and handheld GNSS units. Data segmentation and bootstrapping statistical methods were used to obtain the deviation, which can describe the accuracy of the large sample. The empirical test recording data showed that the error may achieve a sub-meter horizontal accuracy by the simple process of increasing the measurements of smartphones and handheld GNSS units. However, the drawback is the long period of time required. To reduce the satellite tracking time, a least squares solution network was applied over all the recorded data, assisted by the external geometric conditions. The final goal was to obtain the absolute positioning and associated deviations of one vertex from three or five GNSS receivers positioned on a network. The process was tested in three geodetic network examples. The results indicated that the enhanced SPP mode was able to improve its accuracy. Errors of several meters were reduced to values close to 50 cm in 25–37 min periods.

scholarly journals GEODETIC SOFT- AND HARDWARE SYSTEMS BASED ON PERSPECTIVE DOMESTIC GNSS RECEIVERS

2021 ◽  
Vol 1 ◽  
pp. 240-251
Author(s):  
Dmitriy A. Primakov ◽  
Stanislav O. Shevchuk ◽  
Elena S. Cheremisina
Keyword(s):  
Experimental Design ◽  
Position Control ◽  
Geodetic Network ◽  
Form Factors ◽  
Conceptual Systems ◽  
Positioning Systems ◽  
Gnss Receivers ◽  
System Of Plan ◽  
Soft And Hardware ◽  
Gnss Networks

In the article the current problems and the perspectives of compound monitoring and positioning systems based on domestic Russian GNSS receivers are considered. Modernized concepts of those systems are proposed for the issues solving by the perspective GNSS receivers and geodetic net software. The systems based on those technologies are also overviewed. The conclusions on specifications, form-factors and the features of potential receivers are made. Four models of potential GNSS receivers are given based on earlier research and experimental design developments of Russian Institute of Radio-navigation and Time (RIRT). The perspective software modifications for various-purpose GNSS networks are also overviewed. The propositions are summarized with conceptual systems of local automatized geodetic network and the system of plan-height position control. The structure and features of the systems are overviewed. The conclusions of the works were made and the future continuation of the works are given.

scholarly journals METROLOGICAL SUPPORT MEANS OF MEASUREMENTS OF Q FACTOR AND INDUCTIVITY

2020 ◽  
Vol 25 (4) ◽  
pp. 221-228
Author(s):  
Nadezhda A. Vikhareva ◽  
Keyword(s):  
Comparative Analysis ◽  
Quality Factor ◽  
Metrological Support ◽  
Government Regulation ◽  
Measuring Instruments ◽  
Q Factor ◽  
Effective Solution ◽  
Frequency Range ◽  
The West ◽  
Working Standards

The article discusses the metrological support of enterprises with reference instruments for measuring the quality factor and inductance, which is very important for our country. The production of these measuring instruments (measures) and the approval of their type is currently an effective solution to this problem. Considered technical devices developed by the West Siberian branch of FSUE "VNIIFTRI", which act as a standard designed to reproduce a number of inductance and Q-factor values in the frequency range from 0.1 to 1000 kHz. The proposed range of frequencies for the developed measures is much higher than that of other tools designed to measure Q-factor and inductance. The reference means under consideration are included in the scope of government regulation. A comparative analysis of their characteristics with the characteristics known technical devices for this type of measurement is carried out. The results of tests are given, which showed that the frequency applicability of the LQ-2408-3 measure is significantly higher than the previously released measures P596 and 1482 and corresponds to the working standards of the 1st category in accordance with the verification circuit for inductance and Q-factor.

scholarly journals Re-Establishment and Maintenance of Geodetic Networks in Parts of Oyo State Using Modern Techniques

2019 ◽  
pp. 167-183
Author(s):  
Ikharo I. Blessing ◽  
Matthew N. Ono ◽  
Olaniyi Saheed S.
Keyword(s):  
Geodetic Network ◽  
Reference Network ◽  
Differential Gps ◽  
Static Mode ◽  
First Order ◽  
Geodetic Networks ◽  
Related Information ◽  
Gps Measurement ◽  
Gnss Receivers ◽  
Set Up

Oyo state like most of the other states in the Nigeria has an old and conventional Geodetic Network. This network was established and computed using the conventional method of position determination and the science of navigation in the 1930- 1950's which is based on the 30th arc-meridian of the Clarke 1880 modified ellipsoid with its origin at L40 Minna datum. This does not satisfy the overgrowing mapping requirements of the state and as well as other Geo-related information requirements. The required data were acquired with GNSS receivers set up on each of the existing points in static mode. The reference network that was re- established consists of eight (8) primary points, covering an area of approximately ?12km?^2 with an average separation of about 7Km. The new network monuments are made of reinforced concrete, solidly cemented in the ground with metal caps (brass markers), and coordinated using the static carrier phase differential GPS measurement. Several observation sessions were conducted and processed to compute 3D coordinates for the network. Post processed data were rigorously adjusted using Least Squares and must meet the distance accuracy specifications for a first order network (1:100,000). Final coordinates are based on WGS84 frame/ ITRF 2008 datum and are within a mean accuracy of ±0. 05m. Finally, the plots of the re-established control points were presented and thus re-established a reliable first order geodetic reference network within Oyo state. Based on the findings the study recommends all geodetic networks in Nigeria should be re- established.

scholarly journals Performance Evaluation of Low-Cost Multi-Frequency GNSS Receivers and Antennas for Displacement Detection

2021 ◽  
Vol 11 (14) ◽  
pp. 6666
Author(s):  
Veton Hamza ◽  
Bojan Stopar ◽  
Tomaž Ambrožič ◽  
Oskar Sterle
Keyword(s):  
Low Cost ◽  
Geodetic Network ◽  
Satellite System ◽  
Vertical Movements ◽  
Cycle Slips ◽  
Absolute Positioning ◽  
Vertical Displacements ◽  
Gnss Receivers ◽  
Spatial Displacements ◽  
Global Navigation Satellite

Low-cost Global Navigation Satellite System (GNSS) receivers are currently used in various engineering applications. These low-cost devices are regarded as suitable sensors for applications in areas with a high risk of instrument damage. The main objectives of this research were to identify the size of displacements that can be detected in relative and absolute positioning modes by low-cost GNSS instruments and to compare the results of selected antennas. Additionally, geodetic and low-cost GNSS instruments were compared in the level of observations. For this study, low-cost SimpleRTK2B V1 boards, which house ZED-F9P GNSS chips, and three low-cost antennas, namely, Survey, Tallysman TW3882, and Survey Calibrated, were selected. While antenna calibration parameters are known for the last antenna, this is not the case for the first two. For testing purposes, a geodetic network consisting of four points was established; horizontal and vertical movements were imposed by a special mechanism with high accuracy. In relative positioning mode, the results indicate that the Survey Calibrated antenna can detect horizontal and vertical displacements with sizes of 4 mm, and 6 mm, respectively. In the detection of horizontal displacements, the performance of the Survey antenna was not as good as that of Tallysman, and the sizes of detected displacements were 6 mm and 4 mm for the first, and second antennas, respectively. Vertical displacements of 9 mm were detected using both Survey and Tallysman antennas. In absolute positioning mode, Survey Calibrated also had better performance than the Tallysman antenna, and spatial displacements of 20 mm or greater were detected by low-cost GNSS instruments. The observations made with low-cost and geodetic GNSS instruments were compared, and the latter showed better performance. However, the differences in cycle slips and the noise of phase observations were inferior. Considering their cost and proven performance, it can be concluded that such sensors can be considered for setting up a highly accurate but low-cost geodetic monitoring system.

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