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针对同时收发认知抗干扰(SCAJ)系统中IQ通道失衡产生的镜像干扰降低网电空间数据链(CDL)抗干扰能力的问题,研究了IQ通道失衡的单/多频带SCAJ接收机干扰感知性能,推导出基于能量检测的IQ通道失衡接收机干扰检测概率和虚警概率,并据此提出了删除镜像信道干扰信号的有效方法。仿真结果表明,IQ通道失衡产生的镜像干扰降低了SCAJ接收机的检测概率,提出的镜像信道干扰信号删除方法可以减小IQ通道失衡的不利影响,从而提高数据链SCAJ系统性能。
Aiming at the anti-jamming ability of network space-based data link (CDL) against image interference caused by IQ channel imbalance in SCAJ system, the interference perception performance of single / multi-band SCAJ receiver with IQ channel imbalance is studied. , The interference detection probabilities and false alarm probabilities of IQ channel imbalanced receiver based on energy detection are deduced and an effective method for removing the interference signals from the image channel is proposed. The simulation results show that the image interference caused by IQ channel imbalance reduces the detection probability of SCAJ receiver. The proposed method can reduce the adverse effect of IQ channel imbalance and improve the data link SCAJ system performance.