Fleet management.How long is it normal for the Beidou car locator to be able to locate its position

　　First positioning time

　　Cold start first positioning time

　　When the power level of the input satellite navigation signal is -130dBm, the device should be turned on in a state where the approximate position, approximate time, ephemeris, and almanac are unknown. The first time it can continuously output 3D positioning data with a positioning error of less than 100m in the following 10 seconds, the required time should not exceed 60 seconds.

　　Hot start first positioning time

　　When the power level of the input satellite navigation signal is -130dBm, the device should be turned on in a state where the approximate position, approximate time, ephemeris, and almanac are known. The first time it can continuously output 3D positioning data with a positioning error of less than 100m in the following 10 seconds, the required time should not exceed 5 seconds.

　　Recapture time

　　When the device inputs a GNSS satellite signal with a power level of -130dBm and is in normal operation, the GNSS satellite signal is interrupted for a short time of 30s, and can be restored for the first time within 10s after the signal is restored

　　The time required for continuously outputting 3D positioning data with an error of less than 100m should not exceed 5s.

　　sensitivity

　　Capture sensitivity

　　The capture sensitivity should be better than -137dBm. The device is turned on with an unknown approximate position, approximate time, ephemeris, and almanac, and the carrier level of each satellite's single channel navigation signal is not higher than -137dBm

　　It should be able to output 3D positioning data with an error of less than 100m for 10 consecutive times at a 1Hz update rate within 300s.

　　Recapture sensitivity

　　The recapture sensitivity should be better than -142dBm. In the normal positioning state of the equipment, the GNSS satellite signal is temporarily interrupted for 30 seconds and then restored. When the carrier level of each satellite's single channel navigation signal is not higher than -142dBm, it should be able to output 3D positioning data with an error of less than 100m for 10 consecutive times at a 1Hz update rate within 300 seconds.

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