With the emergence of stealth and jamming technology, traditional radar systems are facing great challenges in terms of innovation, number, and energy. It is necessary to develop novel detection systems, explore the initiative of cooperative detection, and utilize the dimensions of information to adapt to new air defense operations in the future. In this study, a new radar system, communicational radar, is proposed. The radar detection ability under the conditions of long-range and strong confrontation can be significantly improved by embedding synchronization information such as the transmitter position, the antenna direction, and the launch time of the emission into the waveform; the embedded information can then be extracted for target detection, reorganization, interference suppression, and multi-target identification. The proposed system is illustrated from the aspects of architecture, detection principle, and performance analysis.