What is the Dual GPS function on a smartphone and why do you need it?


What is the Dual GPS function on a smartphone and why do you need it?
Dual GPS (dual, two-frequency, two-band) is a satellite navigation system that can receive two signals of different frequencies from a single satellite. (Navigation applications: map, directory and navigator (https://t.me/gsmgurus_FAQ/1004))
To find the exact location of the person on the map (https://t.me/gsmgurus_FAQ/554) you will need satellites, a smartphone and GPS. The satellites send signals at a frequency of 1575 MHz (L1), the smartphone receives them and detects its location.
The problem is that the signals pass through the ionosphere, so there is a delay. This causes the coordinates in which the person is located to be determined incorrectly. Therefore, in applications such as Google Maps or Yandex.Navigator, the user location area is displayed incorrectly (for example, on the other side of the street or in a neighboring yard).
Dual GPS adds a second frequency to the positioning process - 1176 MHz (L5). With it, a smartphone can receive two signals from a single satellite at the same time. In this way, the error is eliminated and the person’s location is determined quickly and accurately.
How is Dual GPS different from traditional GPS?
Dual GPS makes the navigation process more convenient and reliable. Its advantages are:
• Accuracy. On a smartphone with dual GPS function, the positioning error is around 30 cm, while a traditional GPS can make an error of tens of meters. A two-frequency GPS can accurately determine which lane a car is moving and which side of the road the pedestrian is going on.
• High speed. Two-range GPS allows the user to quickly determine the coordinates.
• Barrier solution. In large cities, satellite navigation is complicated by tall buildings and a plethora of different signals. L5 is a good solution against frequency interference.
Theoretically, Dual GPS improves and simplifies the navigation process, but in practice there are the following difficulties:
- For the technology to work properly and efficiently, the software and hardware of smartphones with Dual GPS function must also be perfect.
- Some of the satellites do not support the L5 frequency, which means that the presence of the second frequency may not affect the correct detection of the device on the map.
To determine if your smartphone has Dual GPS, install the GPSTest app (https://play.google.com/store/apps/details?id=com.android.gpstest&hl=ru) and launch it in the open field. Wait a while (2-5 minutes) until the app finds all the satellites and check if the values ​​in the “NCH” column have the inscription L5. If you do not see the value of L5, it means that your smartphone does not have Dual GPS function.
In the comments, write down which smartphones you checked have Dual GPS functionality.

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