Introduce the different types of navigation positioning performance testing methods.GPS Tracker for vehicles manufacture

　　1. Laboratory testing, use satellite signal sources to simulate the real satellite signal. This test method can be reproduced and widely used.

　　2. Real field testing, that is, the use of real satellite signals in the sky for testing. This test method is closer to the real experience of the user. The performance assessment of the vehicle terminal is also critical. It cannot be reproduced, and the time and economic costs are high, and have certain limitations.

　　3. Virtual road test, record the satellite signal through the satellite signal collection and playback device, and test the signal in the laboratory. This method has the advantages of laboratory testing and real field testing. The integrity of satellite signal collection and the accuracy of playback are the challenges of Z.

　　The above three methods have their own advantages and disadvantages. Generally speaking, virtual road testing is the future development trend. The navigation positioning of channel simulation virtual road test has also begun to study.

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