基于合成孔径的单站无源定位性能影响因素分析

Performance analysis of passive positioning based on synthetic aperturetechnique for single station

针对传统单站无源定位精度不能满足定位需求的问题,已有学者提出了基于合成孔径的单站无源定位方法。主要研究了脉冲重复周期选择、测频误差以及合成孔径时间对基于合成孔径的单站无源定位性能的影响。分析结果表明:选择脉冲重复周期需要保证不产生方位混叠以避免出现定位模糊;测频误差对方位定位误差的影响远大于距离定位误差;增加合成孔径时间可以提高定位分辨率,同时,合成孔径时间的增加又会引起方位混叠。因此该方法在实际应用时需要综合考虑这些影响因素。

For this problem that traditional single station passive positioning accuracy is unable to satisfy positioning requirement,some scholars have proposed a single station passive positioning method based on synthetic aperture.The influence of pulse repetition period choice,frequency measurement error and synthetic aperture time on single station passive positioning performance on the basis of synthetic aperture is mainly studied.The analysis results show that:the selection of pulse repetition period should ensure that there is no azimuth aliasing to avoid positioning ambiguity;the effect of frequency measurement error on orientation error is greater than that on distance error;the increase of the synthetic aperture time can improve positioning resolution,and furthermore,the increase of the synthetic aperture time also brings about azimuth aliasing.These influencing factors should be taken into account comprehensively in practical application.