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摘要:
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。
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关键词:
- 网电空间数据链 (CDL) /
- IQ失衡 /
- 同时收发 /
- 认知抗干扰 /
- 镜像干扰
Abstract:To enhance the anti-jamming capability of cyberspace data-link (CDL) in the complex electromagnetic environment, we explore the problem of the image interference caused by IQ channel imbalance in simultaneous transmit and receive based cognitive anti-jamming (SCAJ) system. The interference sensing of single-and multi-channel SCAJ system impaired by IQ channel imbalance is investigated, and energy detection based detection and false alarm probabilities in closed-form for SCAJ system are derived. Simulation results show that the detection probability of the SCAJ receiver is decreased by IQ channel imbalance, and the proposed interference cancellation scheme can reduce the adverse effect of IQ imbalance.
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图 2 单频带SCAJ接收机的干扰检测概率
Figure 2. Jamming detection probability for single-channel SCAJ receiver
图 3 多频带SCAJ接收机的干扰检测概率
Figure 3. Jamming detection probability for multi-channel SCAJ receiver
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