Gps displayed elevation with a rotating antenna and a timestamp question

[Mshapira]

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.

 

[Nuvi-Nebie]

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/

 

[Mshapira]

Thanks so much for your explanation.

Anyone knows how to show GPS timestamp on a scope or computer with a 100 nanosecond Accuracy?