ARM干涉仪导引头对chirp信号辐射源测角误差研究

针对ARM干涉仪导引头对chirp信号辐射源的测角问题,从几何关系与信号分析两方面揭示了传统方向角估计方法产生测角误差的机理,分析了干涉仪测角误差随鉴相器积分时间变化的关系,重点对积分时间最长这一极端情况开展研究。结果表明,方向角测量误差随弹目视线偏离干涉仪天线基线的法平面的夹角增大而增大,测角系统误差会增大到几十个角分。为消除测角误差,给出了方向角解析解方程以及工程上可行的简化方法,当鉴相器积分时间取最大时,可以将原来的误差降低六个量级。

Study on error in chirp radiator direction-finding using ARM interferometer seeker

For chirp radiator direction-finding using an ARM interferometer seeker,the cause of the direction-finding error using traditional direction angle estimation is studied,and the relationship between the direction-finding error and the integration time is analyzed,especially for the boundary condition that the integration time of phase discriminators gets the maximum value.The calculation of errors shows that the direction angle error increases with the angle included between the line of sight and the normal plane of the interferometer baseline,and the error may increase to dozens of angle minutes.In order to reduce the error,the analytic equation and a simplified method are developed,which can reduce the error six magnitudes when the integration time gets the maximum value.