导航信号功率增强对阵列接收机的影响分析

为了分析低轨导航增强系统中信号功率增强对阵列接收机的影响, 提出一种信号传播与阵列接收机的数学模型, 基于该模型分析了功率增强条件下最小均方误差算法与直接矩阵求逆算法对抗干扰性能的影响。根据理论分析与仿真实验, 增强信号对最小均方误差与直接矩阵求逆的影响相似, 当信号增强量在15 dB以下时, 阵列抗干扰对信号的影响较小；随着信号功率进一步增强, 增强信号被识别为干扰并进行了抑制；当信号的信噪比增强到10 dB时, 增强信号被抑制约15 dB。研究结果表明, 在采用传统阵列抗干扰方法的情况下, 信号功率的增强并非越大越好, 信号功率增强15 dB时对传统阵列抗干扰的影响较小。

Influence analysis of navigation signal power enhancement on array receiver

In order to analyze the influence of signal power enhancement on array receiver in low orbit navigation enhancement system, a mathematical model of signal propagation and array receiver is given. Based on the model, the anti-jamming performance of the least mean square error algorithm and direct matrix inverse algorithm under the condition of power enhancement is analyzed. According to theoretical analysis and simulation experiment, the influence of enhanced signal on the minimum mean square error is similar to that of direct matrix inversion. When the amount of signal enhancement under 15 dB, array anti-jamming have less effect on the signal. With the further enhancement of signal power, the enhanced signal is identified as interference and suppressed. When the signal to noise ratio of signal is enhanceed to 10 dB, the enhanced signal is suppressed by about 15 dB. The resulte shows that under the condition of the traditional array anti-jamming methods, the enhanced signal power is not the bigger the better. When the signal power is increased by 15 dB, the inflaence on the traditional array anti-jamming is small.