基于LEON3开源软核的卫星导航接收机设计

为了提高卫星导航接收机的工作性能以及小型化设计，在现场可编程门阵列( FPGA)平台上开发一款基于LEON3开源软核的拥有自主知识产权的卫星导航接收机。通过LEON3开源软核架构和自主设计的分段匹配滤波器( PMF)与快速傅里叶变换( FFT)相结合的捕获模块、基于延迟锁定环的码跟踪环路和基于科斯塔斯环的载波跟踪环路相结合的跟踪模块IP核实现卫星导航接收机的基带系统级芯片( SoC)设计，最后完成接收机系统的软件设计并在DE2-115 FPGA平台上对接收机系统进行验证测试。实验结果表明所设计的接收机性能优良，能够正常捕获并且跟踪到卫星信号，定位结果显示正常，误差在3m左右。拥有完全的硬件软件源代码以及优良的性能使得所设计的接收机对国内导航的发展有着重要意义。

Design of a satellite navigation receiver based on LEON3 open source soft core

In order to improve the performance and realize miniaturization of satellite navigation receiver,this paper introduces the design of a satellite navigation receiver with independent intellectual property and based on the LEON3 open source soft core on the DE2-115 Field Programmable Gate Array(FPGA) platform.The baseband System on a Chip(SoC) design of satellite navigation receiver mainly includes the architecture of LEON3 open source soft core and the homegrown IP core of acquisition modules designs based on the combination of Partial Matched Filter(PMF) and Fast Fourier Transform(FFT) and tracking modules designs based on delay-locked code loop and Costas carrier loop.Finally,the performance of the receiver system is verified and tested after the software design of the receiver system is completed.The experimental result show that the performance of the designed receiver can meet the demands.The result of acquisition and tracking is correct and the positioning result with an accuracy of three meters circular error probability(CEP) is correct.The designed receiver with complete hardware and software source code and excellent performance has important implications for the development of domestic navigation.