Design Of Navigation Computer Based On DSP&FPGA

With the rapid development of navigation technology, the requirement of its corepart-navigation computer is increasing, and all kinds of specifically designednavigation computer have come into being. This paper proposed a design ofnavigation computer on the basis of a Digital Signal Processor (DSP) and FieldProgrammable Gate Array (FPGA), after analyzing the development of navigationcomputer at home and abroad.The main contents of this paper include:1. This paper conducted a research of the development of navigation computer athome and abroad, and analyzed the GPS and the IMU that were used, including thebasic principles of navigation, the navigation message analysis and so on.2.A navigation computer hardware platform was designed and implemented byusing the TI Company’s TMS320F28335type of DSP and Altera Company’sEP3C25Q240type of FPGA as its core, supplemented by a small amount ofperipheral chips, and completed the hardware debugging, in which DSP focused onnavigation solution and FPGA was responsible for Micro Inertial Measurement Unit(IMU) and Global Positioning System (GPS) and other data collection, caching, andcommunicating with other modules.3. The hardware logic programming inside the FPGA was implemented. Byreprogrammable configuration and high-speed parallel processing capabilities ofFPGA, it expanded multi-serial communication interface so that the demand ofmultiple input and output were met. Inside the FPGA, asynchronous FIFO memorystructure was used to buffer data. Based on logic and timing relationships, the addressdecoding module and control modules were designed. Thus, the problem of crossingclock domain transmission between the sampling signal and the DSP was effectivelysolved.4. The GPS receiver and IMU, the host computer and the designed navigationcomputer were connected to build a complete system. Through a large number oflong continuous tests, the system succeeded in the data acquisition, processing and transmission tasks. Together with the the follow-up data error analysis, the reliabilityand accuracy of the navigation computer were further verified.The final design of the navigation computer is characterized by a small size, highintegration, low power consumption and reliable performance. It can replace theoriginal hardware platform the lab used and realize navigation functions.