The theory of missile-target relative position estimation with bearing angle is introduced , and the missile-target relative position computation formula is derived in the influence of measurement er-ror.The system observability is analyzed , and aiming to the problem of weak observability when the angle between missile-target relative position and missile-target relative velocity is small , a estimation method based on singular value decomposition is presented .Simulation results show the effectiveness of the pro-posed method .%介绍了仅利用测角信息进行相对位置估计的原理，推导了测量误差影响下弹目相对位置计算公式，分析了仅利用测角信息进行相对位置估计系统的可观性，并针对弹目相对位置与弹目相对速度夹角较小时系统的弱可观性问题，提出一种基于奇异值分解的弹目相对位置估计算法。仿真结果验证了该方法的有效性。
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