grammar - Referring to an object previously mentioned in the sentence

I wish to know, if the bellow sentence is grammatically correct and where I can find more information on forming such sentences

Can you share with me the coordinates of the measuring station, who's
data you sent me last week?

Context: Last week a friend of mine sent me some data and asked me to analyse it. Now I wish to know the coordinates, but I'm not sure, if by using who in the sentence, I am referring to the measuring station in the correct manner (is it a he, a she, or an it).

Answer

Drop the comma and use "whose":

Can you share with me the coordinates of the measuring station whose data you sent me last week?

"Whose" is the possessive form of "who", while "who's" is a contraction of "who is".

Besides that, your sentence is both correct and idiomatic.