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Kernel location and speed measurements

Does anyone know if Core Location on iPhone OS uses anything other than simple vector math to calculate speed? I read that GPS can provide speed measurements that can be accurate when the position is not (I believe using Doppler signal shifts).

I tried and did not see if the iPhone does this. The main question is whether this data contains information or is it just convenient functions using (filtered?) Location data?

I suppose my question is that someone has tried this in reality or knows what is in the documentation .

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The Core Location documentation describes read speed in this way:

This value reflects the instantaneous speed of the device in the direction of its current header.

Although this is not completely final, it strongly indicates that reading is direct and not an interpolation of positions that cannot be described as “instantaneous” by any reasonable definition.

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The GPS system alone cannot provide speed measurement. The only way this can be practically done is to compare with measurements of the discrete position and the time between them. It's just a matter of applying simple math to get speed and direction. You can use more samples to get a more accurate measurement.

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Source: https://habr.com/ru/post/1745237/

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