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Inertial Navigation System
Oct 19, 2018

An inertial navigation system includes at least one computer and a platform or module containing an accelerometer, gyroscope, or other motion sensing device. The INS provides its own initial position, initial velocity, and initial direction from other sources (human operators, GPS satellite signal receivers, etc.), and the computer updates its position, velocity, and direction by calculating and integrating the information received from the motion sensor. . The advantage of INS is that once its position, orientation, and speed are initialized, the system no longer needs an external reference.


The wide application of GPS positioning methods in vehicle positioning and navigation is becoming more and more popular, but GPS is vulnerable to external environment interference, especially in high-rise building communities and tunnels, factories and other vulnerable environments. Meet the positioning requirements. In order to obtain continuous positioning information, it is necessary to combine other auxiliary means. DR is a typical autonomous positioning technology, which can maintain high precision in a short time and has good anti-interference, but DR can only determine the relative position, and the error will accumulate over time. GPS and DR positioning technology have good complementarity. On the one hand, the absolute position information of the GPS output can provide the initial value of the estimated positioning for the DR and error correction; on the other hand, the estimation result of the DR can be used to compensate for the partial GPS positioning. Random errors to smooth the positioning of the trajectory. Therefore, by using the appropriate method to combine the two systems and making full use of the complementarity of the positioning information, it is possible to obtain higher positioning accuracy and reliability than using either method alone.


Inertial navigation system is essentially a simulation of the acceleration and direction of the environment in which people are exposed. Only accelerometers and gyroscopes are more sensitive and accurate to humans than to humans, so we can get more accurate position, velocity and direction information.


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