自适应干扰抵消系统的陷波带宽压缩方法

自适应干扰抵消系统会对邻近有用信号造成抵消效应。针对独立通信平台短波大功率模拟调制干扰，从频域和时域的角度分析了干扰抵消系统造成有用信号衰减和存在陷波带宽的机理，提出了一种能消除有用信号衰减的陷波带宽压缩方法。该方法通过实时检测抵消剩余载波信号大小并与设定值比较，通过比较结果来锁定和释放干扰抵消系统相关器输出的权值，从而维持干扰抵消系统稳态时的恒权值，保证了有用信号不被抵消。仿真结果表明，所提陷波带宽压缩方法可有效保护有用信号不被衰减。

A compression method of notch bandwidth for adaptive interference cancellation system

The desired signal nearby the interference signal may be cancelled by the adaptive interference cancellation system(AICS). For the short wave high power analog modulation jamming on independent communication platform,the mechanism of the attenuated desired signal and the existing notch bandwidth in interference cancellation system(ICS) is analyzed in time-domain and frequency-domain. The notch bandwidth compression method for removing the attenuation of the desired signal is proposed. Through the real-time detection of the residual carrier and comparison with the setting value,the output weights of the correlators in ICS are locked and released. It can maintain the constant weights as ICS is in steady state and also make the desired signal not to be cancelled. The simulation results show that the proposed notch bandwidth compression method can effectively protect the desired signal from fading.