I can't find my car. How to locate?

First of all, the vehicles of Pacific Auto Network need to be equipped with GPS. The car is equipped with a locator, and there is a mobile phone card in the locator. Generally, sending a text message to a mobile phone card will receive a reply message. There is GPS positioning information in the text message. Enter this positioning information online and you will know the location of the car. The easiest way is to contact the service provider, and you can find the location of the car, the last running route and other information through the query platform.

The large number and uniform distribution of GPS satellites ensure that at least four GPS satellites can be observed at any time anywhere on the earth, and ensure the realization of global all-weather continuous navigation and positioning services (except lightning is not suitable for observation).

The application practice proves that the relative positioning accuracy of GPS can reach 10-6 meters in the range of 50 kilometers, 100-500 kilometers, 10-7 meters and 1000 kilometers.

In the precise positioning of 300- 1500m project, the plane position error of the solution is less than 1 mm after more than1hour observation. Compared with the side length measured by ME-5000 electromagnetic wave range finder, the maximum side length difference is 0.5 mm, and the calibration error is 0.3 mm. ..

With the continuous improvement of GPS system and the continuous update of software, the relative static positioning within 20km only takes 15-20 minutes; In the fast static relative positioning measurement, when the distance between each mobile station and the reference station is within 15KM, the observation time of the mobile station is only 1-2 minutes; When the real-time dynamic positioning mode is adopted, the observation of each station takes only a few seconds.

Therefore, using GPS technology to establish control network can greatly improve work efficiency.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)