Inertial navigation systems, also known as inertial reference systems, are self-supporting navigation systems that do not rely on external information or radiate energy externally (as in radio navigation). Its working environment includes not only air, ground, but also underwater. The fundamental operating principle of inertial navigation is based on Newton's laws of mechanics. By measuring the acceleration of the carrier in the inertial reference system, it integrates the time and transforms it into the navigation coordinate system, which can be obtained in the navigation coordinate system. Information such as speed, yaw angle and bearing. The inertial navigation system is attributed to the calculation navigation method, that is, the orientation of a lower point is calculated from the orientation of a known point based on successively measured moving body heading angles and speeds, so that the current orientation of the moving body can be measured in succession. The gyroscope in the inertial navigation system is used to form a navigation coordinate system, so that the measurement axis of the accelerometer is stabilized in the coordinate system, and the heading and posture are given; the accelerometer is used to measure the acceleration of the moving body, once through the time. The integral gets the speed, and the speed is then integrated into the time to get the interval.
Inertial measurement devices, including accelerometers and gyroscopes, also known as inertial navigation combinations. The former is the measurement of the acceleration of the object, which is also called the angular velocity sensor, which measures the angular velocity. Using the parameters of these devices, calculation and navigation seems to be very simple, but because the sampling frequency is generally very high (tens or even hundreds of times in a second), the accumulated error is easy to expand, so the long-term navigation is still very Big difficulty.
When the location is lost, the navigation software knows the speed, the location of the vehicle, and the route of travel. Combined with the acceleration provided by the acceleration sensor, the displacement generated by the acceleration can be calculated according to the method of secondary integration, and then the displacement generated by the velocity is calculated according to the initial velocity, thereby calculating the latest position of the vehicle. This way, you can continue to navigate without GPS.
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