Earlier this year, there was a media response to those with dual-frequency GPSMobile phoneCompared with the mobile phone with single frequency GPS, the results show that the accuracy of the mobile phone with dual frequency GPS is not much improved.
In fact, the Cellon 855 processor itself is equipped with the hardware it needs to run a dual-frequency GPS, but some manufacturers just don't enable it on their phones. Google's Pixel 4 series with Cellon 855 processors illustrates this problem.
One of the advantages of dual frequency GPS is that it supports faster satellite tracking. In addition, the dual frequency system can be upgraded from a single frequency error of 5m to a precision tracking mobile phone with a dual frequency GPS error of 30cm through a single band GPS. This technology can ensure that your mobile phone gets more accurate position tracking, and it also reduces the interference of skyscrapers to GPS signals.
According to Google's product specification table, pixel 4 does not have a dual frequency GPS positioning system. However, in a footnote on the same page, Google points out that the two bands supporting dual band GPS, L1 and L5 in the United States will soon appear.
Google says dual band GPS will soon appear on pixel 4. If users want to judge whether their mobile phone supports both L1 and L5, they need to install gpstest from Google play store. After turning on the mobile phone, look up L1 and L5 in CF (carrier frequency) column. If you can see them, it is proved that the mobile phone supports dual frequency GPS.