相关运算在相位干涉仪解模糊中的应用

介绍了相位干涉仪测向的基本原理以及实际测向中存在的相位模糊问题,及长短基线法和立体基线法两种常用的解模糊算法,分析了这两种算法在实际测向应用中的优点和不足。针对上述两种算法存在的问题,提出了一种基于复相关运算的解模糊算法。该算法避开了传统的＂短基线＂解相位模糊的方法,很好地解决了高频测向中对天线阵基线长度的限制。而且,该算法不拘于某一特定形状的天线阵,阵元摆放形式灵活多样,适用于各种用途的测向系统。仿真结果表明,新算法对多种天线阵具有较强适应能力,且在低信噪比下仍具有良好的估计精度,适于硬件实现。

Application of correlation to resolving interferometer ambiguity in direction finding

The basic principles of direction finding with interferometers and the existing interferometer ambiguity problems in the actual measurement are introduced.Then long-short baseline method and spatial baseline method commonly used in solution of ambiguities are given,and their strengths and weaknesses are analyzed too.In response to these two algorithms’ problems,a new approach to ambiguity resolving based on complex correlation is proposed.This algorithm is a good solution to the restrictions of high-frequency measurements.And,the algorithm is not rigidly bound by a particular shape of antenna array,the array elements can be placed in the form of flexible and diverse,so suitable for various direction measurement systems.The simulation results also show that the new algorithm is adaptable in various kinds of antenna array.Furthermore,it still has good estimation accuracy when the SNR is low,and is very suitable for hardware implementation.