GPS search star is related to many factors. Based on GPS system principle, GPS receiver star search ability strongly depends on satellite signals in the sky. Generally speaking, it relies heavily on the open sky environment. Car GPS can be directly exposed to high altitude. The larger the range of the environment, the more and more satellite signals the receiver searches for, the more accurate the positioning.
Because the GPS receives the microwave signal from the satellite, the natural sky image will shield the GPS signal, the towering buildings, the dense forest will block the GPS search satellite range, so it will also affect the GPS itself to receive the satellite signal, so it can not be searched. Star positioning. Also in the building or in the underground garage, the GPS signal will be completely shielded by the outside world, and the satellite cannot confirm your location. Therefore, in sunny weather, the open space is the main factor affecting GPS search.
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Let's take a brief look at the penetration of GPS signals to better understand what environment has the least impact on search stars.
1, all metal entities will shield the GPS signal, please note that the car film with metal coating will also have a shielding effect on GPS. Heavy-weight non-metallic objects can also affect the search star, and a few centimeters thick wood will completely block the GPS signal.
Even the bus next to it will affect the GPS signal.
2, glass and plastic will have a slight attenuation effect on the GPS signal, so putting the GPS under the car windshield or traveling in the travel pocket will not have much impact on the positioning of the search star.
Rainy weather is the most influential factor in our daily use.
3, the water body with a thickness of 1 cm or more completely attenuates the GPS signal until it is not available, and the search star is even less likely to be realized.
The impact of the building is much less serious than we think.
4, in the city, viaducts, large outdoor billboards and other buildings with a viewing angle of 45 ° or more; outdoors, towering canopies, continuous mountains, will have an impact on GPS search satellite signals.
In the actual measurement, the influence of water body seems to be the most obvious and direct, and the impact of the viaduct and the car glass film is far less serious than imagined. On the other hand, it is artificially reduced in accuracy, because the GPS system is the property of the US military. When necessary, the free civil signal accuracy will be reduced or completely shielded, so it is said in most daily use. Most of the impact we have on the environment comes from the weather.
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