集成平台空域辅助阵列共址干扰抑制技术

针对同时存在恶意干扰与非法窃听的通信环境,提出一种协作干扰(cooperative jamming, CJ)掩护的保密通信架构,收发信机之间采用跳频技术躲避恶意干扰,并采用协作干扰技术阻塞非法窃听。但该架构的通信带宽较大,会在收发频率振荡器中引起显著的同相和正交(in-phase and quadrature, IQ)通道失衡。鉴于此,对收发IQ通道失衡引起的信号失真进行数学建模,给出接收机处信干噪比的数学表达式,并给出干扰抑制比的闭合表达式。仿真结果表明,收发IQ通道失衡引起的信号失真的功率远大于热噪声功率。随着收发IQ通道失衡加剧,所提架构的信干噪比和干扰抑制比性能均会急剧下降,当幅度和相位失衡分别达到0.95和π/50时,信干噪比和干扰抑制比均损失了47 dB。

Spatial domain collocation interference suppression method based on auxiliary array in integrated platform

Due to overlapping frequency bands between frequency-consuming devices, the local transmitter will cause serious collocation interference to the receiver, causing the saturation of receiver antenna interface and failing to work normally. In response to the above problems, a collocation interference suppression method based on auxiliary array was proposed, a collocation interference suppression system model based on auxiliary array was established, the expression of minimum residual interference power was derived, channel conditions that need to be satisfied for collocation interference suppression was proposed. In addition, the location of the auxiliary was analyzed when main-transmitter array was non-cooperative, and the relationship of the locations of arrays was analyzed when the main-transmitter array was cooperative. The theory and simulation results show that the collocation interference suppression method based on auxiliary array can effectively suppress collocation interference at the receiver antenna interface without affecting the transmission efficiency of the local main-transmitter array.