What is precision?
Accuracy is the degree of proximity between the observed value and the true value, which corresponds to the size of the error, therefore, the size of the error can be used to indicate the level of accuracy, the error is small is high accuracy, the error is large is low accuracy.
From the perspective of positioning, accuracy reflects the size of the error between the position coordinates finally solved by a certain positioning technique and the real position coordinates.
For example, if you are standing on a large manhole cover next to a road, but the result is to set you to the opposite side of the pole, the three-dimensional distance between the large manhole cover and the pole is the positioning error.
In order to simplify, here with a two-dimensional plane, static (ignoring the movement) under the conditions of the localization of the situation to explain. The red point in the figure below is the real position, that is, we want to locate the target, the actual positioning results is the blue point in the figure, the green line is the positioning error.
There will be a positioning result for each positioning, but each positioning result is not the same, so these blue dots are scattered around the red dots. For the uninitiated, the positioning results here may be a bit different from what we encounter on a daily basis with mapping software that has been optimized to improve the user experience.
That is, if someone claims that a certain positioning technology can be accurate to 1 meter, it can correspond to a radius of that circle of 1 meter, meaning that most of the error falls within that circle, if not the maximum error used to measure accuracy.
Supply and supply and demand of positioning accuracy.
First of all, let's look at the supply side, that is, to answer the question of what kind of positioning accuracy can the existing positioning technologies achieve?
The following chart lists the current major indoor and outdoor positioning technologies that can achieve an accuracy within the meter level.
Among them, RTK, LiDAR+Map, Camera+Map are all positioning techniques that can achieve centimeter-level (within 0.1 m) accuracy. It should be pointed out that RTK can directly give absolute coordinates, while LiDAR and Camera need corresponding point cloud and image Map respectively to cooperate and give the position relative to the known target point before giving absolute coordinates. The positioning accuracy of UWB, RTD, and PPP is generally less than 0.5 meters, while the positioning accuracy of SBAS is about 0.8 meters.
At present, in industry applications, surveying and mapping is an industry with relatively high requirements for accuracy, and generally requires positioning accuracy of up to the centimeter level in order to solve the problems of map surveying and mapping and engineering sampling. In automatic driving, UAV power inspection, UAV agricultural plant protection and other industry applications, the path planning of unmanned systems also requires up to centimeter-level positioning accuracy. As for consumer-level applications, sub-meter or even meter-level positioning accuracy can meet user needs.
If you have to force a scientific research dog to answer "what kind of positioning accuracy is high precision" this kind of uncritical question, based on SBAS, PPP, RTK, these improved technologies happen to enter the category of 1-meter accuracy, I personally believe that when a certain technology positioning accuracy into the 1-meter range, it can be called the general meaning of the High-precision positioning technology.
Ltd. specializes in high-precision GNSS modules and wireless communication products, technology development and application promotion service providers, relying on the wireless communication technology in the field of research and development and promotion of experience, JUNODA set up a team with a wealth of experience in hardware and software development technology, aimed at domestic and foreign OEM / ODM customers and system integrators to provide high-quality, high-performance wireless module and application We aim to provide high-quality, high-performance wireless modules and application programs to OEM/ODM customers and system integrators at home and abroad, and create long-term value for customers!
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In the field of wireless communication products, the company follows the latest development of international communication technology, introduces and acts as an agent for wireless communication modules that meet the market demand, and the products have a comprehensive layout from 2G, 3G, 4G, and are widely used in financial electronic payment, vehicle remote control, remote advertising information, repeater monitoring, mobile Internet terminals, smart home, remote medical care, network testing, enterprise information management, anti-theft alarm, Remote video transmission, intelligent meter reading, mobile computing, network navigation, voice phone, wireless gateway and other fields. Focused areas include video surveillance, network optimization, routers, POS and other M2M industry applications.
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