通道幅相不一致对SFAP性能影响的分析

Analysis of the effect of amplitude and phase inconsistencies between channels on SFAP

空频自适应处理(SFAP)是全球导航卫星系统(GNSS)阵列抗干扰接收机中常用的算法,而工程实践中,阵列的幅相不一致性是必须考虑的非理想因素。以往文献分析阵列各通道幅相不一致性的影响多集中于波束形成和波达角(DOA)估计的精度上。该文在SFAP算法框架下,结合已知的各通道传递函数,计算观测数据协方差矩阵和最优权矢量,进而可获得SFAP抗干扰性能损失程度的定量结果。计算和仿真结果表明:通道幅相不一致性可严重影响SFAP抗干扰性能。该方法在工程上可用于确定射频通道幅相一致性指标要求。

Space-frequency adaptive processing （SFAP） is frequently used in global navigation satellite system anti-jamming array receivers, but amplitude and phase inconsistencies affect the results in engineering practice. Previous studies have mostly focused on the effect of the amplitude and phase inconsistencies on the accuracy of the beamforming or direction of arrival （DOA） estimate. This study combines the transfer functions for each channel to derive the covariance matrix of the observed data and the optimal weight vector. These are then used to get useful quantitative results to evaluate the error in the SFAP result caused by the channel in consistencies. Calculations and simulations show that the amplitude and phase inconsistencies greatly affect the SFAP result, but this method provides a way to determine the requirements for the amplitude and phase consistencies of radio frequency channels.