基于子空间投影的导航干扰抑制与信号增强方法研究

Study on Navigation Interference Rejection and Signal Enhancement Method Based on Subspace Projection

电磁环境日益恶劣且到达接收机的导航信号非常微弱,导航接收机的输出性能受干扰影响非常明显,因此在干扰背景下提高导航接收机的输出性能是十分重要的。阵列信号处理中的传统抗干扰方法包括采样协方差矩阵求逆SMI(Sample Matrix Inverse)方法、最小均方误差LMS(Least Mean Square)迭代方法、功率倒置PI(Power Inverse)算法等,这些方法具有较高的抗干扰性能,但抗干扰后对信号增强没有效果。本文在子空间投影抗干扰方法的基础上,结合导航信号相关性特点,对子空间投影后信号进行运算,构造最优相关峰矢量,利用该矢量进行波束合成,实现导航信号增强的目的。对实测数据处理可知,该方法可以有效提高抗干扰后导航信号强度。

Electromagnetic environment is becoming worse and worse, and the signal is quite weak. Navigation receiver is sensitive to interference, so it is important to improve the output performance of navigation receiver. The traditional methods in array signal processing include SMI （Sample Matrix Inverse）, LMS （Least Mean Square）, and PI （Power Inverse） and so on. These methods have upstanding anti-jamming but useless to enhance the navigation signal. Based on the subspace projection method and combined the navigation signal self-correlation property, the optimization correlation peak vector is constructed, with which to form the beam and enhance the navigation signal. The processing of the real data identified that the method is effective to enhance the navigation signal.