基于 NTCIP 协议快速路匝道控制器的设计与实现

匝道控制决定了城市快速路进出口匝道以及与之关联的地面道路交通状况,为确保快速路匝道控制与 ITS 系统组成各单元彼此间的“互操作性”和“互换性”。基于 ARM9G20的 CPU 核心板,实现了多接口控制和扩展的匝道控制器,根据 NTCIP 协议中1207匝道交通信号控制协议 MIB 的内容,构建了包含完整对象操作内容的结构体,通过管理中心和匝道控制器间 SNMP 信息报文接收、发送,完成对数据库中对象的读取、设置,实现 NTCIP 1207中相应功能和灯组交通配时的控制,从而解决不同匝道控制器协调、通信上的障碍。

Design and Implementation of Ramp Meter Controller Based on NTCIP

Ramp Meter Control （RMC） determines both the entrance and exit of ramp in urban expressway and the conditions of ground road traffic which it is associated with, in order to ensure the ＂Interoperability＂ and ＂Interchangea- bility＂ between RMC and each unit of ITS system composition. RMC designed in this paper is based on ARMgG20 CPU core board to implement multi-interface control and extension. It follows NTCIP 1207 MIB to build the structure which contains the complete contents of object operation, to send and receive information message of SNMP between the man- agement center and the ramp meter controller, and to achieve read and set of objects in the database. The designed RMC realizes corresponding functions of NTCIP 1207 for traffic signal timing control in light groups, and overcomes obstacles in coordination and communication of different controllers.