中文摘要：

为了提高单独时差或频差定位精度,提出利用最大比合并技术合并TDOA和FDOA方程基于最大似然原理的独立定位解,形成联合定位,合并系数由TDOA和FDOA方程单独定位方差的克拉美罗界对应的Fisher信息逆矩阵来定义。仿真和理论分析表明：该算法的定位性能在有无地球约束条件下均优于单独定位性能,并且逼近克拉美罗界。

英文摘要：

To improve location precision of time difference of arrival（TDOA） or frequency difference of arrival（FDOA）,a joint maximum likelihood（ML） localization of TDOA and FDOA based on maximum ratio combining（MRC） was proposed and the combining factors of MRC were determined by the inverses of Fisher information matrices of TDOA and FDOA location.From simulation and theory analysis,it follows： this algorithm performs better than both TDOA and FDOA,and achieves the Cramer-Rao Lower Bound（CRLB）regardless of earth constraint（EC）.