Enhancements in Uav Flight Control and Sensor Orientation

Bäumker, M.; Przybilla, Heinz-Jürgen; Zurhorst, A.

doi:10.5194/isprsarchives-xl-1-w2-33-2013

Cited by 16 publications

(8 citation statements)

References 2 publications

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“…1-5 deg, which in fact is good enough to realize an automated waypoint flight, but is insufficient for most of the remote sensing or surveying applications. First approaches leading to a cm-accurate positioning of UAVs can be found in (Bláha et al, 2011, Rieke et al, 2011, Bäumker et al, 2013, Rehak et al, 2014. All of these approaches are scientific and non-industrial products.…”

Section: Related Workmentioning

confidence: 99%

Development and Evaluation of a Uav Based Mapping System for Remote Sensing and Surveying Applications

Eling

Wieland

Heß

et al. 2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:In recent years, unmanned aerial vehicles (UAVs) have increasingly been used in various application areas, such as in the remote sensing or surveying. For these applications the UAV has to be equipped with a mapping sensor, which is mostly a camera. Furthermore, a georeferencing of the UAV platform and/or the acquired mapping data is required. The most efficient way to realize this georeferencing is the direct georeferencing, which is based on an onboard multi-sensor system. In recent decades, direct georeferencing systems have been researched and used extensively in airborne, ship and land vehicle applications. However, these systems cannot easily be adapted to UAV platforms, which is mainly due to weight and size limitations. In this paper a direct georeferencing system for micro-and mini-sized UAVs is presented, which consists of a dual-frequency geodetic grade OEM GPS board, a low-cost single-frequency GPS chip, a tactical grade IMU and a magnetometer. To allow for cm-level position and sub-degree attitude accuracies, RTK GPS (real-time kinematic) and GPS attitude (GPS compass) determination algorithms are running on this system, as well as a GPS/IMU integration. Beside the direct georeferencing, also the precise time synchronization of the camera, which acts as the main sensor for mobile mapping applications, and the calibration of the lever arm between the camera reference point and the direct georeferencing reference point are explained in this paper. Especially the high accurate time synchronization of the camera is very important, to still allow for high surveying accuracies, when the images are taken during the motion of the UAV.Results of flight tests demonstrate that the developed system, the camera synchronization and the lever arm calibration make directly georeferenced UAV based single point measurements possible, which have cm-level accuracies on the ground.

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Section: Related Workmentioning

confidence: 99%

Development and Evaluation of a Uav Based Mapping System for Remote Sensing and Surveying Applications

Eling

Wieland

Heß

et al. 2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Numerous efforts are taken in this field. Among other things, Bender et al [4] pointed out the benefits of INS, Tsai et al [21] have developed an algorithm that uses GPS readings along with the INS (called by authors Positioning and Orientation System: POS), Eling et al [8] made use of all possible sensors, including additional cameras, and Bäumker et al [3] have considered the use of dual-frequency GNSS receiver (Topcon B110) and flight tracking using a motorized total station (with two headlights on board the drone). Current flight control is designed to help remote control of air vehicles, in particular, ensuring the safety of the flight (both the drone and objects) along the route of its flight.…”

Section: Current State Of Research On the Use Of Uas For The Purpose mentioning

confidence: 99%

Inventory measurements based on non-metric aerial photos from the board of unmanned aerial vehicle (UAV)

Wyczałek

Plichta

2015

ZNPRzBiS

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The main task of land surveying, among others, is efficient implementation of the inventory of new objects, what sometimes require doing measurements in difficult terrain (mud, cuttings, moving earth masses, working at high altitude) and during ongoing construction works. Geodetic surveys are primarily used to update some databases essential for Polish principal national map, but they also support cadastral and control measurements related to excavation or construction works. Field surveys are usually done by total station or satellite GNSS receivers in a way that guarantees accuracies required in geodesy. It is also allowed the usage of other methods that ensure required accuracies. Photogrammetric technique is one of those methods. Despite the great precision and many other advantages (overall points collection and archiving the state of the object), it has not found a proper place among field measurement methods. Revolutionary developments in this area occurred along the development of small, unmanned flying vehicles (UAV) which can carry onboard camera or other sensor, and can reach places difficult to access by humans. Development of images obtained this way supports more and more developed computer software. This paper aims to bring the adopted method of measuring and computing images taken out from the board of hexacopter (6-rotor drone), discussion about obtained precision and presentation the results of the development of a number of selected terrain objects. As a result, the study found that the results obtained in conjunction with the ability to reach inaccessible places and non-invasive measurement allow to consider this method as a viable alternative to direct methods of inventory measurements.

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“…Kinematic PPP has so far received little attention for direct georeferencing purposes, especially on UAV platforms. This is likely to be because of the limited flight duration (often less than 15 to 20 minutes) of small UAV platforms and the very recent miniaturisation of GPS units (receiver and antennas) to accord with UAV payloads (Bäumker et al., ). The increased UAV platform dynamics over land‐based vehicles also makes accurate GPS positioning more challenging.…”

Section: Introductionmentioning

confidence: 99%

GPS precise point positioning for UAV photogrammetry

Grayson

Penna

Mills

et al. 2018

The Photogrammetric Record

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The use of Global Positioning System (GPS) precise point positioning (PPP) on a fixed‐wing unmanned aerial vehicle (UAV) is demonstrated for photogrammetric mapping at accuracies of centimetres in planimetry and about a decimetre in height, from flights of 25 to 30 minutes in duration. The GPS PPP estimated camera station positions are used to constrain estimates of image positions in the photogrammetric bundle block adjustment, as with relative GPS positioning. GPS PPP alleviates all spatial operating constraints associated with the installation and the use of ground control points, a local ground GPS reference station or the need to operate within the bounds of a permanent GPS reference station network. This simplifies operational logistics and enables large‐scale photogrammetric mapping from UAVs in even the most remote and challenging geographic locations.

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Enhancements in Uav Flight Control and Sensor Orientation

Cited by 16 publications

References 2 publications

Development and Evaluation of a Uav Based Mapping System for Remote Sensing and Surveying Applications

Development and Evaluation of a Uav Based Mapping System for Remote Sensing and Surveying Applications

Inventory measurements based on non-metric aerial photos from the board of unmanned aerial vehicle (UAV)

GPS precise point positioning for UAV photogrammetry

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