空间分辨率是双基地ISAR系统设计中一个关键参考因素。建立了运动目标双基地ISAR空间几何模型。在分析了双基地ISAR的距离分辨率后,从目标运动相对双基地产生的合多普勒关系出发,并推导了其方位分辨率的数学表达式。详细分析了收发基地空间几何关系和目标速度矢量对方位分辨率的影响.得出双基地ISAR成像范围广、不受目标运动方向限制的结论。最后给出了仿真验证,研究结果为双基地ISAR成像技术更深入的研究提供理论依据。
Space resolution is a key factor in bistatic ISAR system design. A general geometrical model of bistatic ISAR with moving target is established in this paper. The range resolution is given and the mathematic express of azimuth resolution is deduced in the sight of target Doppler characteristic. Lastly, the effects on azimuth resolution owing to the position and velocity vector of target are analyzed, and the consolution that bistatic ISAR have lareger imageing rate and no relation with target's vector The results could further consummate bistatic ISAR theory system and provide theoretical basis for studying bistatic ISAR technology.