Geography Reference
In-Depth Information
cases in which the geographic positioning of some objectives which are at some distance
from the surveying vehicle, an optimal variant in the case of an aircraft can be constituted
by IMU unit mounting above the video camera in the mode presented in the following
schema:
Figure 15.
The reciprocal orientation of the IMU unit and the carrying vehicle.
(IMAR - iTraceRT-F200, 2008)
Figure 16.
The mounting variant of the IMU unit in a surveying aircraft. (Novatel, Inertial Explorer,
2009)
The lever arm (offset) between IMU and GPS antenna has to be measured in the IMU
coordinate system and with an accuracy better than 1 centimeter. Even slight deviations in
the measurement of the lever arm may lead to significant position errors and will degrade
the total system performance (Fig.17).
