一种基于相关曲线拟合插值的信号到达时差测量方法

Measurement method of TDOA based on correlation curve fitting and interpolation

针对传统的信号到达时差(TDOA)测量方法存在计算量大、测量精度差、测量模糊等问题,提出一种改进的TDOA测量方法.该算法基于粗测引导精测思想,降低运算量同时提高精度;精测利用互相关函数曲线拟合及插值计算,获取高精度的TDOA.性能分析和仿真实验表明提出的算法获取的TDOA精度更高且计算量较小,为基于单平台短基线TDOA的辐射源定位技术工程化实现奠定基础.

The traditional time difference of arrival(TDOA)measurement method has the problems of large amount of calculation,poor measurement accuracy and fuzzy measurement.In order to overcome the above problems,an improved TDOA measurement method is proposed.The algorithm is based on the idea of coarse measurement leading to precise measurement,which can reduce the computation and improve the accuracy at the same time;the precise measurement uses the curve fitting of correlation function and interpolation calculation to obtain the TDOA with high accuracy.The performance analysis and simulation experiments show that the proposed algorithm obtains the arrival time difference with higher accuracy and less computation,which builds the base of the engineering implementation of the single-platform short baseline emitter location technology based TDOA.