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Algorithms for improving the position determination of an UAV equipped with a single-frequency GPS receiver for low-altitude photogrammetry

100%

Krasuski K. , Wierzbicki D. , Lalak M. , Ciećko A.

tom Vol. 30, nr 3

441--459

The article presents the results of research on the development of a method for improving the positioning accuracy of an UAV equipped with a single-frequency GPS receiver for determining the linear elements of exterior orientation in aerial photogrammetry. Thus, the paper presents a computational strategy for improving UAV position determination using the SPP code method and the products of the IGS service. The developed algorithms were tested in two independent research experiments performed with the UAV platform on which an AsteRx-m2 UAS single-frequency receiver was installed. As a result of the experiments, it was shown that the use of IGS products in the SPP code method made it possible to improve the accuracy of the linear elements to the level of about ±2.088 m for X coordinate, ±1.547 m for Y coordinate, ±3.712 m for Z coordinate. The paper also shows the trend of changes in the obtained accuracy in determining linear elements of exterior orientation in the form of a linear regression function. Finally, the paper also applies the SBAS corrections model for the improvement of UAV position calculation and determination of linear elements of exterior orientation. In this case, the improvement in the accuracy of determining the linear elements of exterior orientation is about ±1.843 m for X coordinate, ±1.658 m for Y coordinate, ±7.930 m for Z coordinate. As the obtained test results show, the use of IGS products and SBAS corrections in the SPP code method makes it possible to improve the determination of UAV positions for the use in aerial photogrammetry.

Complex High Accuracy Satellite and Field Measurements of Horizontal and Vertical Displacements of Control Geodetic Network on Dniester Hydroelectric Pumped Power Station (HPPS)

75%

Tretyak K. , Periy S. , Sidorov I. , Babiy L.

Geomatics and Environmental Engineering

2015

tom Vol. 9, no. 1

83--96

W artykule została zaproponowana technologia kompleksowych pomiarów satelitarnych GNSS i terenowych pomiarów sieci geodezyjnej hydroelektrowni pompowej (HPPS) na rzece Dniestr, prowadzonych na potrzeby obserwacji odkształceń powierzchni terenu. Wdrożenie tej technologii pozwala na zwiększenie dokładności wyznaczenia współrzędnych punktów dzięki zastąpieniu pomiarów GNSS na obszarach o słabym odbiorze sygnałów satelitarnych kątowo-liniowymi pomiarami terenowymi wysokiej dokładności.

Technique of complex GNNS and ground measurements on the control geodetic network of Dniester HPPS for monitoring deformations of the earth surface is proposed and implemented. It allows increase the accuracy of determining the coordinates of points by replacing GNSS measurements in areas of poor reception of satellite signals with precision ground linear-angular measurements.

Determining horizontal curvature of railway track axis in mobile satellite measurements

51%

Koc W. , Wilk A. , Specht C. , Karwowski K. , Skibicki J. , Czaplewski K. , Judek S. , Chrostowski P. , Szmagliński J. , Dąbrowski P. , Specht M. , Grulkowski S. , Licow R.

tom Vol. 69, nr 6

art. no. e139204

The article discusses the applicability of a novel method to determine horizontal curvature of the railway track axis based on results of mobile satellite measurements. The method is based on inclination angle changes of a moving chord in the Cartesian coordinate system. In the presented case, the variant referred to as the method of two virtual chords is applied. It consists in maneuvering with only one GNSS (Global Navigation Satellite System) receiver. The assumptions of the novel method are formulated, and an assessment of its application in the performed campaign of mobile satellite measurements is presented. The shape of the measured railway axis is shown in the national spatial reference system PL-2000, and the speed of the measuring trolley during measurement is calculated based on the recorded coordinates. It has been observed that over the test section, the curvature ordinates differ from the expected waveform, which can be caused by disturbances of the measuring trolley trajectory. However, this problem can easily be overcome by filtering the measured track axis ordinates to obtain the correct shape – this refers to all track segments: straight sections, circular arcs and transition curves. The virtual chord method can also constitute the basis for assessing the quality of the recorded satellite signal. The performed analysis has shown high accuracy of the measuring process.