中文摘要：

在分析磁天线测向原理的基础上，推导了测向误差公式。仿真分析了噪声对罗兰C信号测向误差的影响。结果表明，相对于美国海岸警卫队制定的罗兰C信号接收最低性能标准，信噪比较大时，噪声对测向误差的影响不大；随着信噪比的降低，测向误差逐渐增大，但误差绝对值小于0．15°。

英文摘要：

Direction error formula for magnetic antenna is derived based on its principle and the influence of noise on the direction error is simulated and analyzed. The results show that noise has less influence with higher signal to noise ratio （SNR） on direction error, the direction error increases with the decrease of SNR and its absolute value is less than 0. 15° relative to the lowest standard of Loran-C receiver designed by United States Coast Guard.