相关干涉仪测向算法俯仰角误差分析

Elevation error analysis of correlative interferometer algorithm for direction finding

随着科技的发展,无线发射装置与测向天线位置关系变化,测向系统由一维转变为二维,采样和运算时间增大。通过俯仰角对一维系统产生相位误差的分析,得到了在相位模糊情况下不同阵元距离与波长比的有效测向区间。在复向量代价函数具有一定容差能力的基础上,对不同间隔的俯仰角样本的测向精度进行仿真研究。结果表明,利用俯仰角采样间隔和复向量代价函数,可有效地减少采样时间和俯仰角对于测向精度的影响,10°样本间隔和20°样本间隔适用于工程应用。

With the development of technology, wireless transmitter and antennas are not in the same horizontal plane. Due to 2-dimensions direction finding system, there is a significant increase in cost of sampling and calculating. Analyze the phase error of elevation angle based on the 1-dimension data, and obtain the valid direction range of different ratios of array element distance to wavelength in the presence of phase ambiguity. Based on the tolerance ability of complex vector cost function, the direction finding accuracy of elevation angle samples with different interval is simulated. The result shows that the influence of sampling time and elevation on direction finding accuracy can be effectively reduced by using the elevation interval and complex vector cost function. The interval of 10 and 20 are suitable for engineering application.