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Working principle of the Inertial positioning and orientation system
Oct 19, 2018

The working principle of the inertial positioning system is basically the same as that of the semi-analytical inertial navigation system.

Before the system works, the initial alignment is performed first, so that the inertial sensitive combination platform is leveled with respect to the local horizontal plane, so that the sensitive axes of the north accelerometer and the east accelerometer are aligned in the north and east directions, respectively. Enter the geodetic parameters of the starting point into the computer of the system. After the ground vehicle (such as a car) equipped with an inertial measurement system is started, the inertial sensitive combination uses three accelerometers to measure the accelerations in the three directions of north, east and vertical, respectively, and inputs them into the onboard computer in digital form. After the integral operation, the positional changes in the three directions of north, east and vertical are obtained, and then added to their initial values to obtain the position coordinates of each moment, to achieve the purpose of positioning. At the same time, using the accelerometer output results obtained in real time and measuring the vehicle position coordinate measurement results, the control signals of the three channels of the platform servo system are obtained through computer software processing. The control signal is input to the servo drive device to rotate the inertial sensitive combination platform, so that the sensitive axes of the three accelerometers (ie, the three axes of the platform) are consistent with the direction of the reference coordinate axis.


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