针对低空经济发展涉及的安全管理问题，在总结低空经济相关技术路线原理及落地方案的运行经验，分析低空安防普适性的4个建设方案：雷达与通感一体技术融合方案、广播式自动相关监视技术方案、远程识别技术方案和基于TDOA（time difference of arrival）无线电技术的多源融合方案的基础上，构建无人飞行器探测技术评价指标体系，并建立了一种基于决策试验评估实验室（decision-making trial and evaluation laboratory, DEMATEL）和优劣解距离法（technique for order preference by similarity to an ideal solution, TOPSIS）的多属性评价方法。结果发现，以TDOA为基础的多源融合方案是构建城市低空安防体系的有效路径和普适性方案。研究表明，低空安防体系的建设是一个系统性工程，需要政府、企业和社会各方的共同努力，在技术、数据、运营等多个层面进行整合，以适应未来低空经济的发展需求。

In order to address a series of safety management issues involved in low-altitude economic development, the technical routes and principles of low-altitude economy as well as the operational experience of implementation plans are summarized, and four universal construction plans for low-altitude security and protection are analyzed, namely the radar and integrated perception technology fusion plan, the broadcast automatic dependent surveillance technology plan, the remote identification technology plan, and the multi-source fusion plan based on TDOA radio technology. On this basis, an evaluation index system for unmanned aerial vehicle detection technology was constructed, and a multi-attribute evaluation method based on DEMATEL and TOPSIS was established. The results show that the multi-source fusion plan based on time difference of arrival (TDOA) is an effective and universal solution for building a low-altitude security system in cities. It is concluded that the construction of a low-altitude security system is a systematic project, which requires the joint efforts of governments, enterprises and the whole society. Integration is needed at the levels of technology, data and operation to meet the future development needs of the low-altitude economy.