Abstract: Inertial navigation is a kind of autonomous navigation without external force. It mainly utilizes the motion data collected by terminal inertial sensors, such as acceleration sensors, gyroscopes, etc. to measure the speed, direction, acceleration and other information of the object.

Navigation is the first solution to the problem of positioning, the most widely used outdoor positioning is GPS positioning, the specific principles of another talk. But the GPS signal indoors, tunnels, underground and other places can not be received, while the city's elevated, high-rise places due to multi-path effect and other reasons such as the error increases, basically inadmissible, in this case we have to use inertial navigation to achieve.

Inertial navigation is a kind of autonomous navigation without external force (receiving signals outside the body). The main use of terminal inertial sensors collected motion data, such as acceleration sensors, gyroscopes and other measurements of the object's speed, direction, acceleration and other information, based on the navigation position speculation method, after a variety of operations to obtain the object's position information.

With the increase of walking time, the error of inertial navigation and positioning is accumulating. It needs to be calibrated by external higher precision data sources. Therefore, nowadays inertial navigation is usually combined with WiFi fingerprinting, requesting the indoor position through WiFi every once in a while, so as to correct the error generated by MEMS. This technology is now commercially mature and is widely used in floor sweeping robots.

Advantages of inertial navigation:

1, because it is an autonomous system that does not depend on any external information and does not radiate energy to the outside, it is well hidden and not affected by external electromagnetic interference;

2, can be all-weather, full-time work in the air, the surface of the earth and even underwater;

3, can provide position, speed, heading and attitude angle data, the resulting navigation information continuity and low noise;

4, high data update rate, short-term accuracy and stability.

Disadvantages of inertial navigation:

1, as the navigation information is generated through integration, the positioning error increases with time, and the long-term accuracy is poor;

2, A long initial alignment time is required before each use;

3, the equipment is more expensive;

4、Can not give time information.

Junoda mainly provides integrated antenna module, dual-frequency high-precision module, single-frequency high-precision module, Qianxun high-precision module, Zhongke micro-positioning module, U-BLOX positioning module, SICOM communication module, inertial navigation DR module, UW GNSS module, RTK differential module, 4G communication module and high-precision antenna, etc. Our products are sold well in Beijing, Shanghai, Shenzhen, Guangdong, Jiangsu, Zhejiang, Sichuan, Hunan and other parts of the country. The company's GNSS module is widely used in unmanned aerial vehicles, vehicle security monitoring and scheduling, automatic bus stops, DVR tachographs, car DVD navigation, GPS electronic dog, synchronized timing, high-altitude balloon monitoring, engineering machinery, industrial automation and other applications.

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