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卫星导航终端是通过对接收信号频谱进行干扰检测、判别置零,实现窄带干扰抑制。然而,在接收信号时域离散化过程中会对离散信号序列产生截断,这在时域上表现为离散信号加上一个矩形窗。该时域截断会导致信号频谱泄露,造成信号频谱检测和判别置零的有效性下降,降低终端抗窄带干扰能力。文中通过研究并选择合适的离散信号加窗函数,抑制信号旁瓣减少频谱泄露,提升系统抗窄带干扰能力。研究表明:不论是在大干信比(100 d B)条件还是小干信比(40 d B)条件下,凯撒窗性能都优于传统的矩形窗。
Satellite navigation terminal through the interference of the received signal spectrum detection, determine the zero, to achieve narrowband interference suppression. However, the discrete signal sequence is truncated during the time domain discretization of the received signal, which appears as a discrete signal plus a rectangular window in the time domain. This truncation in the time domain will lead to spectrum leakage of the signal, resulting in the decrease of the validity of signal spectrum detection and discrimination and reducing the capability of the terminal to resist narrowband interference. In this paper, by studying and selecting the appropriate windowing function of discrete signals, the signal sidelobe can be suppressed to reduce the spectral leakage and enhance the system’s ability to resist the narrowband interference. The results show that Caesar window performance is better than that of the traditional rectangular window under the condition of large signal-to-interference ratio (100 d B) or small signal-to-interference ratio (40 d B).