2.4G辅助定位在电子公交站牌中的应用分析

随着基于CDMA网络的通信终端的日益增多,电信网络往往因信息传输量大从而造成丢包率陡增,从而影响网络传输质量.特别是对通信实时性要求较高的电子公交站牌,越来越庞大的上下班客流量容易影响站牌的显示及时性.鉴于此,提高电子公交站牌的通信实时性是提高其服务质量的本质所在.针对这一目的,设计了一种基于NRF24L01的简单RF辅助传输方式,与本身的基于第三方网络的CDMA模块形成“双模”传输,从而为电子站牌提供辅助定位的功能.首先分析了电子站牌发展现状,然后对RF模块电路部分和软件实现部分进行了说明和实现,最后对2种模块进行丢包率测试.测试结果显示：该设计模式具有稳定,可靠的特点,可以为现有平台提供更精确的定位功能,为消费者提供实时的车辆到站信息.

2.4G assisted positioning in application analysis in the electronic bus stop

With the increasing number of communication terminals based on CDMA, telecommunications networks often re- sult in large amount of information transmission due to the packet loss rate increased sharply, thus affecting the quality of network transmission. Especially for the electronic bus stop demanding real-time, increasingly large passenger flow affects the quality of the timeliness. For this reason, the essence of improving the quality of service is to improve the timeliness of the electronic bus stop. Thus to design a simple RF-based NRF24L01 auxiliary transmission is necessary, which forms a “dual-mode” transmission combined by its own CDMA module based on third-party network of China Telecom, so as to provide electronic stop assisted positioning results. Experiments show that the design pattern has a stable, reliable results and it can provide more accurate positioning, to provide consmners with real-time vehicle arrival information for the existing platform.