基于FPGA的组合导航系统专用接口板设计

Design of special interface board of integrated navigation system based on FPGA

在低成本MIMU/MR/GPS组合导航系统中,为了解决不同设备之间因接口不同而不能直接进行数据交互的问题,设计了一种专用接口板。该接口板选用FPGA作为核心的控制器件,并辅助以单片机PIC18LF6520和少量的芯片,为符合不同协议规范的多种设备间数据传输提供通道,在各种设备间架起一座通讯的"桥梁"。经过跑车实验,证明了该接口板性能可靠,功能强大,具有一定的通用性。详细阐述了该接口板的硬件设计思想和基本工作原理,给出了FPGA和PIC18LF6520的软件编程逻辑流程图。

In the low-cost MIMU/MR/GPS integrated navigation system, different devices with different interfaces can not communicate directly. In order to realize real-time data transmission among such devices that according with different protocol standard, a special interface board using FPGA as the embedded microcontroller was designed. With the help of PIC18LF6520 and some other chips, the special interface board sets up a communication ＂bridge＂ among various devices successfully. It is proved that this special interface board is reliable, powerful and universal in application through vehicle field tests. The design approach and basic operation principle were discussed, and the software flow chart was also given.