无人机对辐射源定位方法精度分析与控制策略

An Accuracy Analysis and Control Strategy on Emitter Geolocation Method for UAV

为了将无人机对辐射源目标的定位精度提高,首先,从全系统的角度建立了以无人机单机运动模式通过测量设备提取相位差变化率的辐射源定位算法模型。其次,通过对该模型的误差分析和数值仿真,证明了大部分定位误差的来源并非是测量设备带来的,而是由无人机系统的控制能力和控制与导航系统的测量精度带来的。特别是无人机机动或受扰动中产生的偏航角速率极大地影响系统的定位精度。最后,用飞行力学的基础理论,分析了减少误差产生的方法,提出了无人机定位中的航线规划与控制的基本方案。经试验证明,施用本方案后,定位的精准概率提高了近30%。

In order to improve the geolocation accuracy of UAV for emitter target, first of all, from the angle of the whole system, an algorithmic model on emitter geolocation which draws the rate of phase difference change through task measuring equipments by the mode of single UAV＇s movement has been established. Secondly, by means of error analysis and numerical value emulation on the model, it is proved that the source of geolocation errors are mostly not brought by task measuring equipments, but caused by controllability of UAV system and measurement precision of control and navigation system. Especially the yaw angle rate which is generated when an UAV is motorized or disturbed greatly influences the precision of system location. Finally, according to the basic theory of flight mechanics, the methods which could eliminate these errors are analyzed, and general plans on airline planning and control in geolocation of UAV are provided. According to practical experiments, the probability of geolocation precision has been increased by nearly 30% after these plans are carried out.