The common evaluation metrics or standards used to test the accuracy of GPS devices are? Autopilot GPS concerns in?

How to test the accuracy of GPS devices and what are the common evaluation indexes or standards? What are the concerns for self-driving GPS?

Detecting the accuracy of GPS devices, commonly used evaluation indicators or standards are: detection of GPS accuracy, if it is in a stationary state, the accuracy is very good to detect, with the measurement of the identification of the special RTK equipment to locate the center of the antenna of its autopilot car can be detected. The RTK equipment in the field of surveying and mapping has the measurement standards and methods issued by the State Bureau of Weights and Measures to identify. But for the mobile state how to identify the accuracy, when it is more difficult a problem, we generally use measurement type RTK equipment placed on the roof of the car, the antenna and the car antenna fixed error through the measurement to determine out the fixed error, and then set the high-frequency output. Both sides use each pin data to compare the maximum and minimum values. For directional accuracy is better calibrated, as long as the high-performance laser inertial guidance for the true value, do the comparison can be.

For self-driving GPS concerns in which places: for self-driving cars, the use of GPS should pay attention to, the stability of the high-frequency output, differential communication smoothness and antenna installation of the installation of the open position. Because the use of high-precision solution to do solving, so also pay attention to if the data is not fixed solution and data in case of no output backup redundancy design.