基于量子相干和量子空间定位的原理，设计了量子空间定位的实验方案.讨论了在脉冲激光作用下，由第二类自发参量下转换所产生的纠缠光子对的光谱特征、对应的相干函数特点以及对量子定位的影响.结果表明，随着激光脉冲宽度的增加，纠缠光子对的相干性减小，量子定位的测量准确度降低.

Based on the principle of quantum coherence and quantum spatial positioning, the experimental scheme of the quantum spatial positioning is designed. The spectrum characteristics of the entanglement photons with spontaneous type-II parametric down-conversion pumped by a broadband frequency pulse laser are discussed. The characteristics of the second-order coherent function and the impact of the phase matching conditions on the quantum spatial positioning are analyzed. It is shown that awith the increase of the pump band-width, the coherence of entangled biphoton is diminished, and the measuring accuracy of the quantum spatial positioning is also reduced.