frequency sweep on pixhawk

Hi everyone,

I am using pixhawk on my gas powered helicopter. I am planning to run some experiments on my helicopter. In these experiments, i am supposed to use a varying frequency, that is frequency sweep signals on each of the 4 control channels. i didnt seem to find a way to do so as of now. Please suggest a way to do it. Also the frequency sweep is a computer generated signal generated using matlab. my hardware is as follows.

Gas powered helicopter

pixhawk

dx18 rc

thank u

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