基于LwIP的GNSS基准站设计  

Design of GNSS reference station based on LwIP

作　　者：陈云 CHEN Yun(Xi’an UniStrong Navigation Technology Co.,Ltd.,Xi’an 710065,China)

机构地区：[1]西安合众思壮导航技术有限公司,陕西西安710065

出　　处：《电子设计工程》2020年第23期143-148,共6页Electronic Design Engineering

摘　　要：GNSS系统单点定位精度均在米级,但较多场景需要亚米和厘米级GNSS定位系统,这时均需要使用差分定位技术。GNSS基准站作为差分改正数据的源头,是GNSS高精度定位系统的重要组成部分。文中展现了由Cortex M3处理器与GNSS接收机构成的一款低成本、易维护的嵌入式GNSS基准站设计方案。在LwIP协议栈RAW接口基础上扩展实现了兼容AJAX+HTML5的Web服务器,实现了基准站参数的远程配置及GNSS状态动态监控;在PBUF_ROM基础上,根据基准站差分数据业务特点设计ROM式缓存用于Ntrip Caster服务器,借此构建了满足Ntrip协议标准的差分数据播发器与服务器。测试结果显示,该设计满足GNSS基准站的远程监控及设置、Mini版Caster基站等功能需求,该方法可用于类似监控类传感器设备的产品设计。The single⁃point positioning accuracy of GNSS systems are all in meter level,but in many scenarios,sub⁃meter and centimeter⁃level GNSS positioning systems are required.At this time,differential positioning technology is required.The GNSS reference station which provided the differential correction data,is an important part of the GNSS high⁃precision positioning system.This article presents a low⁃cost,easy⁃to⁃maintain embedded GNSS reference station solution.It made up by a Cortex M3 processor and a GNSS receiver.The solution implement a Web server solution based on AJAX+HTML5,though extended the RAW interface of the LwIP stack.The Web server support remote configuration of the embedded device’s parameters,and support GNSS dynamic status monitoring.And introduce a ROM-type cache for Ntrip Caster broadcast correction data,which based on PBUF_ROM and GNSS correction data’s variable characteristic.The testing result shows that the GNSS reference station designed by LwIP support remote Web monitoring and configuration,and support working as a Mini Caster server.This method can be used for similar monitoring sensor equipment’s design.

关 键 词：嵌入式设备 GNSS基准站 LWIP Ntrip Caster AJAX 

分 类 号：TN967.1[电子电信—信号与信息处理]