均匀圆阵相关干涉仪相位模糊问题研究

Study of Phase Ambiguity Problem of Uniform Circular Array Correlation Interferometer

相关干涉仪测角体制具有测角精度高、算法简单、运算速度快、抗干扰能力强等优点,已被广泛应用于军事和民用等各个领域。对均匀圆阵相关干涉仪测角相位模糊问题进行了研究,提出了M元均匀圆阵相关干涉仪无相位模糊的条件,并以5元均匀圆阵相关干涉仪为例,求出了满足无相位模糊条件的半径波长比的最大值;对均匀圆阵相关干涉仪测角精度与半径波长比、信噪比以及标准阵步长的关系进行了分析,通过仿真对分析结论进行了验证,对于均匀圆阵相关干涉仪的工程应用具有一定的参考意义。

Correlation interferometer angle measurement system has the advantages of high angle measurement accuracy,simple algorithm,fast operation and strong anti-jamming ability,etc.,and has been widely used in military and civil fields.In this paper,the phase ambiguity of angle measurement by uniform circular array correlation interferometer is studied,and the condition of M-element uniform circular array correlation interferometer without phase ambiguity is proposed.The 5-element uniform circular array correlation interferometer is taken as an example,the maximum radius-wavelength ratio satisfying the condition without phase ambiguity is obtained.The relationship between the angle measurement accuracy of uniform circular array correlation interferometer and radius-wavelength ratio,signal-to-noise ratio&standard array step length is analyzed,and the analysis conclusion is verified through simulation,which has a certain reference significance for the engineering application of uniform circular array correlation interferometer.