More precise GNSS position for the track recording

[osioli@gmx.de]

Hello,

my interest is, to get a more precise GNSS position for the track recording as it is done by the usage of the mobile phone internal GNSS receiver. Background is, that during my hiking tour, specially in mountain, valley and forest regions, the tracking of the position and related altitude is not as precise as I want to have it. One good example is, if you are standing close to the edge of a deep hollow and the measuring point jumps between bottom and top, the result is a altitude calculation, which is far from real.

In a first step, I bought a GNSS receiver from Adrusimple, which allows together with an RTK helix antenna very precise measurements, if the programming is done well, which I worked out over several weeks. I'm using this equipment since month now and I'm really happy with the related results. But: The costs are really high, about 300€ and not really an option for maybe other interested user.

https://c.gmx.net/@324496113698608933/o7FrrIyoRO2bJBvz3TvjnQ

So in the second step, I tried to reduce the cost by using catalog single components and a cheaper U-Blox M9N GNSS chip. After a lot of testing and programming, the new receiver delivers nearly the same positioning quality as the former one. I will now do some further optimizations on the housing and tests in mountain regions. 
If you like, I will keep you informed and show some comparison measurements with simple mobile phone logging afterwards.

https://c.gmx.net/@324496113698608933/O2pO6Q3PSVKd8CJFrGcSpQ

https://c.gmx.net/@324496113698608933/SPFE4rx-TYOWzHWZ7A_C1Q

I'm looking forward to get some feedback from you side, if you have same experience and maybe interest to get further information details.

Cheers

Olaf

[osioli@gmx.de]

Hi,

today I made a first comparison, to make it more and easier visible. The pictures shows a track measurement with a Samsung S10 mobile phone and the same configuration of the other S20 recording phone for the seperate GNSS receiver.

It is ealsiliy visible, that in the areas, where the boundary conditions are worse, the mobile phone starts failing and the GNSS receiver shows the advantage.

Please take a look:

Example 1:

- Mobile S10: https://c.gmx.net/@324496113698608933/WuHjHue5RUeQ9AyBsU7eIg
- Perfect Shot GNSS Receiver: https://c.gmx.net/@324496113698608933/QditWyVVT4OQmbpuAVn5Ew

Example 2:

- Mobile S10: https://c.gmx.net/@324496113698608933/sDB_yH7qTXSmT9ymj6xhLg
- Perfect Shot GNSS Receiver: https://c.gmx.net/@324496113698608933/h3kkw4WWTW2F9REXYYGgng

Please take a look and feedback your impression.

Thanks

Olaf

[0709]

Images speak louder than words ;-)