In order to solve the problem of interference to other interrogators and being interfered by enemies in the collaborative work mode of inquiry response for identification of friend or foe, a directed response technology for identification of friend or foe is proposed. Using circular array antennas and array signal processing algorithms, the direction of arrival of the interrogation signal is calculated, forming a narrow beam pointing towards the interrogator for response. The simulation results show that this technology can achieve directional response, reduce interference to other direction interrogators, and reduce response power.