This article aims at the interference suppression problem of full-duplex relay terminals in the telemetry, tracking and command (TT&C) network system, analyzes the interference signal characteristics and the delay expansion of the self-interference signal when the transmitting and receiving antenna arrays are separated, and analyzes the interference in sub-arrays of different sizes. To solve the signal delay expansion, a kind of interference suppression method is proposed after the combination of array antenna reception beamforming. This method expands the delay range according to the layout of the array and the delay expansion of interference signals in sub-arrays of different sizes. All array elements are equivalent to one array element, which greatly reduces the complexity of radio frequency suppression. Theoretical analysis and simulation experimental results show that this method can effectively suppress interference signals. For the scenario of 256 array element transmitting front and 256 array element receiving front, the simulation compared the interference suppression performance under different tap numbers. The simulation results show that using 16 taps can suppress interference with a carrier frequency of 26.8 GHz and a bandwidth of 200 MHz. The signal suppression capability is greater than 47 dB.