GNSS/INS

Achieving Higher Surveying Performance
Highly accurate positioning of the position, attitude, and direction of the drone
Built-in high-performance GNSS/INS combined navigation system with improved data output rate

Laser surveying requires calculating how long it takes the laser beam to return from the object tens of thousands of times per second.
In this process, the position to be irradiated with the laser beam is surveyed by GNSS, but it can only be surveyed several tens of times per second, resulting in a large error in the position of the target.
In addition, it causes a positional deviation equivalent to the measurement error of the laser beam irradiation angle multiplied by the distance to the object.
Therefore, the farther the target is, the less accurate the coordinates of the target can be determined, even if the error in the irradiation angle of the laser beam is small.
Then, the accelerometer captures the movement of the drone, and the gyro sensor detects the constantly changing attitude of the drone.
The combination of IMU (Inertial Measurement Unit) and GNSS is called GNSS/INS combined navigation (inertial navigation) system, and by utilizing the advantages of each other, a highly accurate surveying system is completed.
The INS of the TODT series has the specification to realize highly accurate surveying of several tens of millimeters while irradiating tens of thousands of laser beams per second.

FOV

Selected viewing angles important for surveying

The requirement for drone laser surveying is accuracy of elevation.
The surveying accuracy of elevation values is the accuracy of GNSS plus the laser ranging accuracy, but the farther the scan angle is from the vertical direction, the greater the surveying accuracy of the attitude at the time of laser irradiation affects the accuracy of elevation values.
The miniVUX-3UAV, which has a 360°FOV (field of view), cuts the surveying area because the laser hits the drone body at 180° in the upper half and the amount of data increases.
Two types of FOV selectable: Downward 120°with high surveying accuracy and high laser intensity, and downward 180°useful for structures such as buildings, bridge piers, dams, and overhang-shaped topography.

TDOT 7 SETTING

Renovated TDOT 7 dedicated application

Access TDOT 7 by communicating with a device that can use a browser, such as a tablet, via Wi-Fi.
Detailed settings such as ON/OFF switching of laser settings, real-time cross section, visible camera, thermography, etc.
TDOT application has been renovated, such as viewing status information as before.

REAL TIME DATA DISPLAY

Real-time display of data during surveying

Viewing data in real-time during surveying.
For example, by displaying a cross-section of the object, it is possible to check in real time during flight the status of ground surface data acquisition under vegetation in areas where trees are thriving.
As a result, it is possible to check on the spot whether the survey has been carried out as planned, and to carry out efficient survey work without rework.
※To view cross-sectional data during surveying, the drone must be equipped with an image transmission device that can be connected to HDMI.
In the case of DJI’s Matrice300RTK, it can be viewed through DJI SkyPort.

CAMERA/THERMO

Equipped with visible light camera and thermography camera (Optional)

Equipped with visible light camera and thermography camera (Optional)
Visible light camera can generate orthoimages and add color information to the acquired point cloud data.
A thermography camera is used to detect temperature information that cannot be determined by a 3D point cloud.
It performs a visualization effect that visualizes relationships, characteristics, and trends that have not been seen before.

RTK

RTK with LTE wireless communication
Real-time analyzed point cloud data is transferred to the server on the spot

The LTE wireless communication module built into the TDOT 7 NIR and the high-performance single-board computer “NVIDIA Jetson Xavier NX” allow the scanned data to be analyzed and processed in real time and stored as point cloud data with positioning accuracy and accurate location information.
The analyzed data is uploaded to a dedicated server in real time using an LTE line.
Acquired data can be viewed immediately from a remote location.
All of this will be implemented as a long-awaited system that can run TDOT 7 NIR alone.

Kinematic Processing

Seamless kinematic processing

TDOT series provides a system that seamlessly builds a series of tasks, from automating optimal trajectory analysis using fixed stations that require knowledge to outputting point cloud data.
TDOT 7 NIR can perform conventional kinematic processing without RTK.