This circuit records the exact time the laser pulse leaves and returns to the scanner. Every transmitted laser pulse can have up to multiple returns as it is reflected off of objects on the surface. Every returned pulse must be precisely timed to ensure an accurate measurement. And all the timing related parameters are controlled by this electronic board.
All of us are aware of the GPS receiver system and most of us have used it while traveling towards new places. The GPS unit in the LIDAR system records the precise x, y, and z positions of the scanner. To improve the accuracy most of the LIDAR uses a fixed ground reference station. This ground station has a known location and is used to correct and improve the collected data of lidar sensors. The GPS with IMU allows for the direct geo-referencing of the points.
Inertial Measurement Unit (IMU):
This unit contains an accelerometer, gyroscope, and magnetron sensors that measure the velocity, Orientation, and gravitational forces.
A reliable computer system is required to make sure that all of the individual components of the system are working properly. The computer system integrates the data from the Laser system, GPS, and IMU to produce useful data for further calculations.