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Generally, the signal transmission and positioning accounting process between space part (satellite), ground control system and user equipment (navigation and positioning equipment) is a very fast process. The influencing factors mentioned here mainly depend on the launching method of the navigator.

　　Automobile navigator manufacturerIt is learned that the starting methods of positioning and navigation equipment are divided into cold starting and hot starting. The so-called cold start refers to the launch process of starting the navigator in a strange environment until the navigator contacts the surrounding satellites and calculates the coordinates. The hot start means that there is no too much movement of the launch navigator at the place where it was shut down last time, but the interval between the previous positioning time is necessary to be less than 2 hours, and the launch is carried out after some preparation work such as preservation and closure before launch through the method of software.

Many small partners will be confused. We might as well experience what is cold start and what is hot start through examples.

Cold start scenario:

1. When used for the first time;

2. When the ephemeris information is lost due to battery depletion;

3. Move the receiver at an interval of more than 1000 km in the off state.

It can be seen that the cold start is a mandatory start through the hardware method, because the internal positioning information of the navigator has been cleared after the previous operation, and the navigator has lost the satellite parameters, or the existing parameters are too different from the actually received satellite parameters, resulting in the navigator unable to work. It is necessary to obtain the coordinate data supplied by the satellite again, Therefore, when the vehicle starts the navigation from the basement, it is 100% cold, which is also the reason why it takes a long time to search for stars from the basement.

Hot start scenario:

1. Short stop and closed navigation at any time

2. Replace the navigation battery, update the map, restart and other operations in the vehicle, resulting in the temporary closure of the on-board navigation.

It can be seen that the starting navigator is not moved too much at the place where it was shut down last time, but the interval between the previous positioning time is necessary to be less than 2 hours. It can be started after some preparations such as preservation and closure before starting through the method of software.

Through the above analysis, my friends must now know that the main factors affecting the accuracy of vehicle navigation and positioning are the shielding of huge objects and cloud climate, and the main factors affecting the positioning speed are the restart operation we have carried out. In fact, these situations sometimes overlap, and any skill is not omnipotent, We should develop a good habit of using on-board navigation: finish positioning when it is empty, low-speed and good climate, and finish positioning before driving at high speed. After the closed navigation time is long, please be patient, give yourself more time for navigation and positioning on-board equipment, and give yourself a good mood!

The article comes from Jiangmen vehicle navigatorhttp://ti-e.com.cn