关键词: 外辐射源雷达, 5G通信信号, 同步信号块, 自相关性, 相位解缠, 干涉仪测向, 虚拟基线测向, 目标探测

Abstract:

In view of the phase ambiguity problem that occurs between the phases of 5G SSB(Synchronization Signal Block) during the target detection process of 5G external radiation source radar, this study proposes a virtual baseline direction finding technology for external radiation source radar based on 5G SSB signals. The correlation of the signal structure in the 5G communication signal SSB is utilized to confirm the SSB index, and the phase angle information is extracted at the corresponding SSB index positions. A phase unwrapping algorithm is adopted to reduce the phase ambiguity, and the target angle is obtained through the virtual baseline direction finding algorithm. A 5G toolkit is used to generate simulated signals for simulation analysis. The results show that the proposed method has a better direction finding effect compared with the traditional direction finding method. When the SNR(Signal-to-Noise Ratio) is -15 dB, the ambiguity resolution probability of the proposed method is 88.48%, and the RMSE(Root Mean Square Error) is 1.15°. The experimental results indicate that the proposed method can measure the target angle more accurately and has a better measurement accuracy than the traditional direction finding method.

Key words: external radiation source radar, 5G communication signal, synchronization signal block, autocorrelation, phase unwrapping, interferometer direction finding, virtual baseline direction finding, target detection