diff --git a/doa_doppler_est.tex b/doa_doppler_est.tex
index 4da3552..9352502 100644
--- a/doa_doppler_est.tex
+++ b/doa_doppler_est.tex
@@ -99,6 +99,7 @@
 \newacronym{doa}{DoA}{Direction-of-Arrival，波达方向}
 \newacronym{ecef}{ECEF}{Earth-centered, Earth-fixed，地心地固}
 \newacronym{eci}{ECI}{Earth-centered Inertial，地心惯性}
+\newacronym{efim}{EFIM}{equivalent Fisher information matrix，有效费舍尔信息矩阵}
 \newacronym{esprit}{ESPRIT}{Estimation of Signal Parameters via Rotational Invariant Techniques，旋转不变信号参数估计法}
 \newacronym{fdoa}{FDOA}{Frequency Difference of Arrival，到达频率差}
 \newacronym{fim}{FIM}{Fisher Information Matrix，费舍尔信息矩阵}