针对天基雷达相比机载雷达高度更高,在杂波仿真时不能按照平面模型假设,并且地球自转带来的影响不能忽略的特点,文中考虑了地球球体模型、地球自转的影响,提出一种可以计算出等距离杂波环的经纬度的方法,适用于仿真任意轨道的天基雷达等距离杂波环的回波。首先,通过投影与坐标变换的方法计算出等距离杂波环在地球惯性坐标系下的坐标;然后,考虑地球自转,计算出杂波点的多普勒频率;最后,根据雷达发射功率、天线方向图、系统损耗等雷达参数计算出杂波点的幅度,从而得到杂波的回波。仿真实验验证了该方法的有效性。

Compared to airborne radar, the height of space-based radar is much higher. Therefore, the earth cannot be assumed as flat surface, and the earth rotation must be considered in space-based radar clutter simulation. In this paper, a simulation method of space-based radar clutter is proposed. This method can be used to emulate the iso-range clutter of space-based radar with arbitrary orbit. The earth sphere model and the effect of earth’s rotation are considered in this method, with the longitude and latitude of the iso-range clutter points can be calculated. First, the position of the clutter point in earth centered inertial ( ECI) is calculated through projection and transformation of coordinate. Second, clutter Doppler frequency is calculated with the consideration of earth rotation. Then, the amplitude of clutter is calculated with the parameters of radar system like transmit power, antenna pattern and system loss, et al. The iso-range clutter is obtained in the final. Computer simulation validates the effectiveness of this method.

TN959.7

国家自然科学基金资助项目(61701395)