What are the benefits of dual-frequency GPS, and what are the supported mobile phones?

Picking a mobile phone, have you paid attention to the navigation function?

More and more friends will use cars to travel, even riding, walking, and using public transportation facilities will also use navigation.


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Now mobile phones can already be navigated, except for some owners who use the navigator. Technology brings convenience to everyone. Many functions that used to require specialized equipment. Now basically a mobile phone can be fully realized.


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However, most people choose mobile phones to look at the value, look at the configuration and shooting ability.

The female user phenomenon of the Appearance Association is more prominent. They only need to think that the mobile phone is beautiful and beautiful, can take photos, whether it is Kirin attention Brand Fans:

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or Xiaolong or MediaTek, the price is not cheap, it doesn’t matter, it is not clear what the dual-frequency GPS is. I like to get it OK. Therefore, many people have not paid attention to the dual-frequency GPS configuration when choosing a mobile phone.

 

What is dual frequency GPS? How to identify the phone is a dual-frequency GPS configuration?

Whether it is single-frequency GPS or dual-frequency GPS configuration, the appearance of the mobile phone is not visible, and can only be viewed from the parameter list. The so-called dual-frequency GPS function is a detailed annotation behind the GPS in the mobile phone parameter list, generally labeled as “GPS (L1 + L5)” or “GPS (L1/L5)”.


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Screenshot of the Glory v20 mobile phone parameter table as shown above. The single-frequency GPS, the parameter list is only marked with GPS, there is no other detailed annotation.


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The navigation function of the mobile phone is completed by an independent GPS chip in the mobile phone. The world’s first dual-band GPS mobile phone is the Xiaomi 8 mobile phone from Xiaomi Company. On May 31, 2018, the Xiaomi 8 mobile phone was released. Its movement was equipped with the Broadcom BCM47755 navigation chip for the first time, becoming the world’s first dual-band dual-channel GPS mobile phone.

In the past, the single-frequency GPS mobile phone has only one signal receiving frequency band L1 in its GPS chip due to technical limitations. After receiving the electromagnetic wave signal, it is interfered by multiple physical factors such as atmospheric refraction, high-rise building blockage and air eddy current. The actual positioning and navigation effect has a certain error, so that some users say that the quality of the mobile phone is not good, and the navigation is not allowed. Actually, it is not because it is because your geographical location affects the navigation effect of the mobile phone, and the situation of the mobile phone itself is very small.

After the new GPS chip is installed in Xiaomi 8, its receiving frequency band has changed from the original single L1 to the L1 and L5 two signal receiving frequency bands, which has broken the traditional single-frequency navigation function and has become a highlight of Xiaomi’s high-end mobile phone configuration.

Subsequent Xiaomi 9 also supports dual-frequency GPS. While other brands attention Brand Fans:

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have mobile phones that support this feature.


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Huawei attention Brand Fans:

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Mate20, Huawei Mate20Pro, Glory v20, and Glory Magic2 all support dual-band GPS.


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The oppo Reno 10x zoom version also supports dual-frequency GPS.

 

Dual frequency GPS implementation and application


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To use dual-frequency GPS, the device must have support hardware. Using the Broadcom BCM4775 chipset, Xiaomi combines a sensor hub microcontroller with an integrated GNSS to achieve dual-band GPS compatibility. According to a paper published by Broadcom, the company BCM47755 that manufactures the chipset can receive the following signals simultaneously:

GPS L1 C / A

GLONASS L1

Beidou (BDS) B1QZSS L1

Galileo (GAL) E1GPS L5

Galileo E5a

QZSS L5

Aside from the technical factors, all you need to know is that the Broadcom BCM4775 chipset used in the Mi8 can receive signals from two different frequency bands simultaneously; L1 / E1 and L5 / E5, so the Mi8 can use dual-frequency GPS.

The BCM47755 chip supports two frequencies (L1+ L5), so the phone achieves lane-level accuracy outdoors, is more resistant to multipath and reflected signals in urban scenes, and has higher immunity to interference and interference. . The use of two frequency bands at the same time can also reduce errors from other sources, such as those caused by electronic interference in the ionosphere.


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However, since the dual-frequency GPS does not have the accuracy improvement effect of the quantitative positioning, the self-use Xiaomi 9 turns on the dual-frequency GPS and basically does not have much difference. Therefore, there are very few mobile phones that follow this technology. For the time being, it is an alternative.

Orignal link:https://post.smzdm.com/p/akmrqpp4/