平流层飞艇晃动对雷达测量误差的影响分析

Analysis of the Influence of Stratospheric Airship Swaying on Radar Measurement Error

为了分析平流层飞艇晃动对雷达测量误差的影响,首先建立飞艇晃动模型及相关坐标系,然后推导出包含平流层飞艇姿态晃动的雷达测量误差模型。基于该模型分别仿真了飞艇三个方向的晃动姿态角对艇载雷达测角和测速的影响。结果表明:飞艇偏航角、俯仰角和滚转角的测量误差对雷达测量目标方位角和俯仰角的误差有不同程度的影响,且误差变化曲线与目标的方位角、俯仰角变化曲线存在一定关系;艇载共形阵雷达天线布置在艇艏时,飞艇的偏航和俯仰运动会给目标回波带来额外的多普勒分量,从而给雷达带来速度测量误差。

In order to analyze the influence of stratospheric airship sloshing on radar measurement errors,the swaying model of airship and related coordinate system are first established. Then,the radar measurement error model including attitude sloshing of stratospheric airship is derived. Based on this model,the effects of swaying attitude angles of airship in three directions on airship-borne radar angle and velocity measurement are simulated and analyzed respectively. The simulation results show that the errors of yaw angle,pitch angle and roll angle of airship have different influences on the errors of azimuth and elevation angle measured by radar,and there is a certain relationship between the error curve and the azimuth and elevation curve of the target. When the conformal antenna of the airship-borne radar is arranged on the bow,the yaw and pitch motion of the airship will bring extra Doppler component to the target echo,which will bring the velocity measurement error to the radar.