Gps displayed elevation with a rotating antenna and a timestamp question

Discussion in 'General GPS Discussion' started by Mshapira, Mar 8, 2024.

  1. Mshapira

    Mshapira

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    Hello.

    I noticed that when my gps antenna is rotating rapidly the elevation shown on the display is changing



    this happens also when only the antenna is moving.

    I would like to have an explanation of why this is happening, how does the gps calculate elevation, and also how can I receive a gps satellite signal from a single satellite and display it on my scope or computer with 100 ns accuracy.

    thanks.
     
    Mshapira, Mar 8, 2024
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  2. Mshapira

    Nuvi-Nebie Moderator

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    A GPS takes in pseudo range data from 4 or more satellites and does a calculation on the data, the result is X, Y, Z and clock, X and Y equate to latitude and longitude and Z is altitude, in the video the GPS on the edge of the fan is effectively travelling forward and backwards very quickly, this disturbs the pseudo range measurements

    See also :- https://www.gps-forums.com/threads/how-does-gps-work.46355/
     
    Nuvi-Nebie, Mar 8, 2024
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  3. Mshapira

    Mshapira

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    Thanks so much for your explanation.

    Anyone knows how to show GPS timestamp on a scope or computer with a 100 nanosecond Accuracy?
     
    Mshapira, Mar 16, 2024
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