Inertia Navigation System)
Reference http://baike.baidu.com/view/1574404.htm
Definition 1:
A complete set of devices that can complete inertial navigation tasks.
Application discipline:
Ship Engineering (level 1 Discipline); ship communication navigation (level 2 discipline)
Definition 2:
The high-precision inertial sensitive devices, such as gyroscope and accelerometer, are used to measure the acceleration of the motion carrier. Then, an autonomous navigation system is used to calculate the acceleration, position, attitude, heading, and other navigation parameters of the motion carrier.
Application discipline:
Aviation Technology (level 1 Discipline); flight control, navigation, display, control and record system (level 2 discipline)
The basic working principle of inertial guidance is based on Newton's Law of mechanics. By measuring the acceleration of the carrier in the inertial reference system, it points time and transforms it into the navigation coordinate system, you can obtain the speed, yaw angle, and position in the navigation coordinate system.
Inertial Navigation SystemINS is an auxiliary navigation system that uses a accelerometer and gyroscope to measure the acceleration and rotation of an object and uses a computer to continuously estimate the position, attitude, and speed of a moving object. It does not need an external reference system and is often used on airplanes, submarines, missiles, and various spacecraft.
GPS (global positioning system) Global Satellite Positioning System: A system that uses GPS to locate and navigate globally in real time (multiple GPS satellites are located around the Earth ). The GPS function must have three elements: GPS terminal, transmission network, and monitoring platform.
GPS components:
1. Space section. 24 satellites
2. Ground Control. Collects information sent from satellites, and computes satellite calendars, relative distances, atmospheric correction, and other data.
3. user devices. GPS signal receiver. Based on the data, the micro-processing computer in the receiver can locate and calculate based on the positioning solution, and calculate the longitude and latitude, height, speed, and time of the user's location.
In 1988, another last modification was made: 21 working stars and 3 standby stars were working on six tracks of 30 degrees each other. This is how GPS satellites work now.
The basic principle of the GPS navigation system is to measure the distance between a satellite at a known position and a user's receiver. Then, the specific position of the receiver can be known based on the data of multiple satellites.
GPS navigation system satellites are used to continuously send navigation messages. However, since the clock used by the user's receiver cannot always be synchronized with the satellite clock, except for the user's 3D coordinates x, y, and z, we also need to introduce a delta T, that is, the time difference between the satellite and the receiver, as the unknown, and then use the four equations to resolve the four unknowns. Therefore, if you want to know where the receiver is, you must be able to receive signals from at least four satellites.
GPS receiver receives satellite signals
GPS/INS Combined Guidance
GPS-assisted inertial guidance.
