中文摘要：

根据两个不同频率信号理论上可以解稀疏阵列相位模糊，但由于噪声干扰并不能完全消除稀疏阵列相位模糊。为了研究相位模糊在瞬时检测时对错误判决目标角度的影响，该文采用单脉冲比幅法检测目标角度并推导了噪声环境下目标角度服从的概率分布。根据该分布计算得到不同频率信号照射到稀疏阵列时的误判概率，并比较了比幅法只考虑单脉冲之比实部与综合考虑实部和虚部的区别。结果表明综合考虑实部和虚部得到的目标角度概率分布与仿真数据吻合。

英文摘要：

The aliasing of sparse arrays could be theoretically discriminated by two signals with different frequencies, but it could not be eliminated completely in the presence of noise. In order to research the effect on the error decision of target＇s angle of arrival in instantaneous detection in the condition of aliasing, monopulse amplitude-comparison is exploited to detect the angle of target and the distribution of detected-angle in the noise is derived. The error decision probability of target＇s angle due to different frequencies signals illuminating the sparse arrays also is obtained according to the distribution above, and the difference between the amplitudecomparison considering only real part of the monopulse ratio and both parts is compared. The results show that the pdf of target＇s angle by considering both parts is accordance with the simulation data.