LiAir
22
0N User Guide • GreenValley International Inc.
Page 9
Notice: Avoid direct exposure of the laser scanner to any laser pulse
from other laser transmitters. The laser scanner cannot be directed by
any strong laser (including the laser from laser transmitter of other
laser scanner). The strong laser can do permanently damage to the
receiver of the laser scanner.
2.5.2 Position and Orientation System (POS)
The airborne Position Orientation System (POS) is an inertial measurement unit (IMU) and Global
Navigation Satellite System (GNSS). POS systems are used to accurately determine system velocity,
position, and attitude values at specific moments in time.
a)
Global Navigation Satellite System (GNSS)
Global navigation satellite system, or (GNSS) on LiAir 220N supports, mainly includes GPS, GPS (the
U.S.), Galileo satellite navigation system, (Europe), BeiDou Navigation Satellite System (China), and
GLONASS (Russia). The GNSS of LiAir 220N includes the aviation GNSS antenna and the base station
antenna.
b)
Inertial Measurement Unit (IMU)
Inertia measurement unit, or IMU, consists of a high-accuracy three-axis gyroscope and a high-
accuracy three-axis accelerometer. It is the benchmark center of the LiDAR system. Its role is to get
the position and orientation information without external reference data.
The LiAir 220N integrates a 3-axis MEMS (Micro-Electro-Mechanical System) gyroscope, 3-axis MEMS
accelerometer and dual GNSS/BD receivers into one system, the POS system. Together the POS
system components gather multi-reference parameters that provide accurate, effective and reliable
(BLANK) by optimization algorithm of integrated navigation system.
