传统的单目标地理定位方法无法适应现代战场态势实时多变、目标数量多的情况。为了提高目标定位效率，在单目标地理定位的基础上，给出一种适用于机载光电侦察系统的半主动多目标定位算法。通过建立初始东北天坐标系、飞机东北天坐标系、飞机机轴坐标系、光电稳瞄坐标系和多目标投影坐标系，同时结合目标相对方位、俯仰角度，得到了一系列欧拉角坐标转换公式，可以同时计算出多个地面目标的经纬度。计算机仿真结果表明：该算法能够对同一视场内的多个目标同时进行定位，即具有多目标定位功能。由于像素偏差增加了坐标转换累积误差，次目标定位精度略低于主目标定位精度。

Traditional single target position finding method can not fit the condition that the situation of modern war field changes in real time and has many targets. In order to enhance the efficiency of target positioning, this paper developed a new semi-active multi-target positioning algorithm for airborne optoelectronic system on the basis of single target position finding. Through establishing the initial east-north-up (ENU) coordinates, aeroplane ENU coordinates, crankshaft coordinates, EO stabilized-aiming coordinates and multi-target projection coordinates, a series of coordinates transform formulas using the relative angles of target were derived, which could calculate the longitudes and latitudes of multi-target. The result of computer emulation showed that this algorithm could calculate the latitudes and longitudes of multi-target at the same time. The positioning precision of hypo-targets was lower than that of the main target because of the increased accumulated error of coordinates transforming by the pixel deviation.