基于基线相似扩展的相差定位技术

Phase Difference Location Based on Similar Expansion in Baseline

研究了通过相似扩展方式实现长基线相差定位的方法。根据相差定位原理,采用两套多基线多通道相位干涉仪,构造一个长基线测量阵列。每套相位干涉仪一方面提供目标方位,另一方面解算出被测目标在短基线上的路程差。在按几何相似递推得到对应于长基线阵列的程差值之后,由相差定位方程即可解得目标的径向距离。初步的精度分析表明,在扩展基线长度为1公里时,即可实现小于5%R的相对测距误差。

The method realizing phase difference location in long baseline is researched by similarity extension.According to the principle of phase difference location,a long baseline array can be constructed by using two multichannel phase interferometer as subarray.On the one hand,each phase interferometer provides target orientation.On the other hand,it solves for the path difference of measured target in short baseline.As soon as the path difference of long baseline array is obtained by geometry similar recurrence method according to the path difference of short baseline,the radial distance of target can be determined by phase difference location equation.Rudimentary analysis of precision indicates that the ranging error less than 5%R can be realized on condition that expanded baseline length is close to 1 km.