改进的相关干涉仪测向处理方法

A DF method for the improved correlative interferometer

提出一种改进的相关干涉仪测向处理方法.与直接使用相位差的常规相关干涉仪不同,它首先利用观测相位差的三角函数构造复数向量,再与天线的阵列流形进行拟合.由于三角函数在主值区间内及边界处都是连续的,因此该方法解决了相位差在主值区间边界处的跳变问题,从而完全消除了相位差跳变引起的数据拟合错误.改进的相关干涉仪不需要对相位进行去跳变处理,也不用进行长短基线的数据匹配,具有算法简单、性能稳健的特点.

A new estimation method, called the improved correlative interferometer, is presented for direction finding（DF）. Unlike the conventional correlative interferometer, which uses phase difference directly, it firstly employs trigonometric functions of the measured phase difference to construct complex number vectors, and fits them to the array manifold which is a continuum of response vectors of the antenna array. Since trigonometric functions are continuous at all points including the boundary of the principal value region, this technique naturally solves the problem of the break of phase differences and eliminates the data match error. Neither the unwrap of phase differences nor the data match among long baselines and short ones is necessary, and thus the de,scribed approach is simple and robust. The results of numerial simulations and applied DF systems show its validity and correctness.