摘要
多通道相位干涉仪能实现单脉冲测向定位,定位精度较高,在电子侦察中应用广泛。但系统误差的存在使得其定位精度下降。分析了影响定位精度的主要因素,即基线安装角系统误差、基线长度系统误差和相位差系统误差。在此基础上提出一种基于多标校站的非线性最小二乘(NLS)干涉仪系统误差联合估计方法。该方法利用干涉仪同时测量得到多个标校源辐射源信号的相位差,利用高斯-牛顿(Gauss-Newton)法多次迭代求出系统误差值。理论和仿真分析表明,该方法能有效估计出系统误差,估计误差可达到克拉美-罗下限(CRLB),能有效提高干涉仪测向定位精度。
Multi-channel phase interferometer can get the direction of arrival to localization by single-pulse with high accuracy. It is widely used in electronic surveillance. However, the existence of system error decreases the localization accuracy. The main factors that impact the accuracy are analyzed, including baseline installation angle system error, baseline length system error and phase system error. Based on this, a NLS （Non-linear Least Square） system error estimate algorithm is proposed. It measures the phase from several known emitters, and then uses the Gauss-Newton method to get the system error. Theoretical analysis and simulation results show that this method can effectively estimate the systematic error parameters, and the estimated error can achieve the CRLB. It can effectively improve the interferometer;s localization accuracy.
出处
《航天电子对抗》
2015年第3期1-5,64,共6页
Aerospace Electronic Warfare
