In a statement the Football Association said: "The person in question was the son of an invited Club Wembley member who had to follow a formal registration process on entry to St George's Park.
"The FA were aware of his identity and we will take the appropriate action in due course as a result of this unacceptable behaviour." Harry was sitting his A-level exams on Thursday and could not be reached.
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Harry Peak dressed in full England kit and ran onto the pitch at St George's Park, ahead of the friendly with Turkey on Sunday.
FSK is widely used in modems and fax modems, and can also be used to send Morse code.
two-way radio systems, music synthesis, magnetic tape-recording systems and some video-transmission systems.
The national team's chief physiotherapist realised something was wrong and ordered him off the pitch.
When challenged by Roy Hodgson, Harry introduced himself as players looked on.