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The airborne sonar transmits the compound signals that consist of high-voltage signal and low voltage signal through a coaxial cable. The high power and voltage electrical pulse, the control command and the direct current are sent to the end of the underwater carrier. The high-rate underwater data is sent from the end of the underwater carrier to the receiving end of the aeroplane. The frequency division coupled network of traditional transmission method is so complicated that the system has a relatively high bit error rate and lower reliability. In order to solve these problems, a novel transmission method of relay coupled network with the protection scheme and bidirectional transmission is proposed, which makes the low and high voltage circuits being isolated completely using switches. Based on the Manchester coding and decoding technique, the time-multiplexed bidirectional transmission of the large-capacity data is achieved. The experiments show that the bit error rate of the test system is less than 10-7, the actual bit transmission rate is more than 7 Mbit/s, and the maximum transmission range is more than 500 m. This method can be used for the reliable transmission of the large dynamic range compound signal. [ABSTRACT FROM AUTHOR]