signals matching between random modulations transmitter and humminbird sonar

hello i would like to ask how to match random signals of a transmitter to the signals of a humminbird imaging sonar so that the sonar is able to obtain imaging information from the random signals of the transmitter. is there a way of determining all the modulations of the sonar and the transmitter by scanning them. i will be using an sdr to send the random signals from the transmitter to the sonar. thanks very much.