窄带干扰抑制对码相位测量零值的影响分析

研究伪码测距中窄带干扰抑制算法对码相位测量零值的影响，构建窄带干扰抑制下的码相位零值偏差分析模型，确定窄带干扰抑制的等效滤波器特性与码相位零值偏差的关系，并给出窄带干扰抑制等效滤波器权值与码相位零值偏差关系的简化分析表达式。数值分析和蒙特卡洛仿真结果表明：等效滤波器呈现线性相位特性的窄带干扰抑制算法不会造成码相位测量零值的偏差；等效滤波器呈现非线性相位特性的窄带干扰抑制算法对码相位测量零值的影响取决于滤波器权值与伪码自相关函数相关的结果。

Effect of Narrowband Interference Suppression on Pseudorandom Code Zero Value

Effect of narrowband interference suppression (NBI) on pseudorandom code zero value in PN code ranging system is presented. The equivalent filter model for classic NBI suppression algorithm is used to establish a model of analyzing the effect of NBI suppression on code phase bias. The relationship between the code phase zero value bias and equivalent filter characteristic is determined, and a simplified analytical model is proposed. Both theoretical analysis and simulations illustrate that the linear phase filter has no effect on code phase zero value; nonlinear phase filter has an effect on carrier phase zero value, which is directly related to the convolution results of the weights of filter and pseudo-code autocorrelation function.