平台相控阵导引头寄生回路和制导性能分析

结合雷达相控阵波束控制原理和平台导引头稳定跟踪技术,完成了基于平台角速度前馈解耦的平台相控阵导引头(phased array seeker with platform, PASP)控制系统建模。根据前馈信号提取点的不同,完成了相应的隔离度传函与寄生回路稳定性研究。研究表明,与捷联结构相比,采用平台稳定结构能大大提高相控阵导引头的隔离度水平;采用稳定平台角速率陀螺输出作为相控阵前馈信息能够保证隔离度寄生回路具有较大的稳定域。考虑典型随机干扰,利用伴随法,完成了隔离度寄生回路对制导系统的影响研究。仿真结果表明,采用平台相控阵结构,利用角速率陀螺前馈的导引头方案能够有效抑制隔离度寄生回路对末制导系统的影响,获得较好的制导精度,与寄生回路稳定性分析的结果吻合。

Analysis of the parasitical loop and guidance performance of phased array seeker with platform#br#

Based on the radar phased array beam control theory and the stable tracking technique of the platform seeker, the control system model of the phased array seeker with platform (PASP) is established. Platform rate feedforward is used to decouple the line of sight (LOS) rate from projectile disturbance. According to different feedforward signals, the corresponding disturbance rejection effect (DRE) and parasitic circuit are studied. The study shows that the DRE of PASP is much smaller compared with strapdown seekers, and the stability of the parasitic loop seems better when the output of gyroscope is selected as the feedforward signal. Considering the typical random noises, the parasitical loop effects on the guidance system are analysed using the adjoint method. The results show that when using the structure of the platform and choosing the gyroscope output as the feedforward signal, and the phased array seeker can effectively reduce the influence of DRE on terminal guidance and achieves a better performance.