阵列旋转对功率倒置算法性能的影响分析

Analysis on the Influence of Array Rotation on the Performance of Power Inversion Algorithm

针对卫星导航抗干扰中,功率倒置算法下导航信号载噪比受干扰来波方向的影响,通过理论推导和数值计算的方法研究了天线阵列旋转与功率倒置算法抗干扰性能的关系。分析结果表明:天线阵列旋转会使功率倒置算法下的阵列增益在最大值和最小值之间呈现连续的、周期性的变化。相比固定天线阵不变的载噪比,阵列旋转能够使信号在一段时间内获得更大的载噪比,对于四阵元Y型阵列,阵列旋转理论上对载噪比的最大提升程度可以达到14dB左右。仿真结果验证了理论推导的正确性。

In the anti-jamming process of satellite navigation,the carrier-to-noise ratio of navigation signals under the power inversion algorithm is affected by the direction of interference signal.The relationship between the antenna array rotation and the anti-interference performance of power inversion algorithm is studied by theoretical derivation and numerical calculation.Analysis results show that the antenna array gain of power inversion algorithm is periodic with the antenna array rotating and it varies continuously between the maximum and minimum values.Compared with the invariable carrier-to-noise ratio of the fixed antenna array,array rotation can improve the carrier-to-noise ratio for a period of time,for a four-element Y-type array,the theoretical maximum improvement of carrier-to-noise ratio is up to 14 dB by array rotation.The simulation results verify the correctness of the theoretical derivation.