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基于SOPC实现扩频信号的捕获与跟踪 被引量:2

Acquisition and Tracking of Direct-Spread-Spectrum Signal Based on SOPC
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摘要 扩频信号的捕获与跟踪是扩频接收机进行定位解算的基础,提出了利用FPGA内的嵌入式软核NiosⅡ在单片FPGA内实现扩频信号捕获与跟踪的设计方案。详细分析了该方案的匹配滤波器、相关器、载波跟踪环和码跟踪环设计和实现方法。给出了根据该设计对实时的GPS信号的捕获跟踪测试结果。结果表明,该设计能够实现对扩频信号的实时捕获与跟踪,相比利用FPGA+DSP方案实现扩频信号的捕获与跟踪,具有可重构性好,硬件开发难度低,接收机体积小等优点。 The acquisition and tracking of direct-spread-spectrum signal (DSSS) is the foundation for direct-spread-spectrum signal receiver positioning. The design model for realizing the acquisition and tracking of DSSS in single FPGA chip based on embedded software core NiosⅡ in FPGA is described. The design and implementation of the matched-filter, correlator, code tracking loops and carrier tracking loops are described in detail. Based on this edsign model, the results for acquisition and tracking of the real-time GPS signal are given. Experiment test indicates that this method can successfully acquire and track the real-time DSSS signal. Compared with the model of FPGA+DSP, it has the advantages of easier reconstruction, lower difficulty for hardware development, smaller volume of the receiver.
出处 《通信技术》 2008年第12期92-94,97,共4页 Communications Technology
基金 国家自然科学基金资助项目(10673011) 中国科学院"西部之光"人才培养计划资助项目 湖南省教育厅科学研究基金资助项目
关键词 扩频接收机 FPGA SOPC 嵌入式软核MiosⅡ DSSS receiver FPGA: SOPC embedded software core NiosⅡ
作者简介 黄飞江(1972-),男,博士研究生,讲师,主要研究方向为空天时间同步与导航; 卢晓春,研究员,硕士生导师,主要研究方向为高精度时间比对方法与技术; 吴海涛,研究员,博士生导师,主要研究方向为时间频率与导航. 边玉敬,研究员,博士生导师,主要研究方向为时间频率测量与控制技术。
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  • 1Sung-Chun Bu, Gyu-In Jee, Hun-Soo Cho, et al. A FPGA-Based Software GPS Receiver Implementation Using Simulink [C]. The 2004 International Symposium on GNSS/GPS, Sydney, Australia. 6 - 8 December 2004:312-322.
  • 2Dafesh P A, Holmes J K. Practical and Theoretical Tradeoffs of Active Parallel Correlator and Passive Match Filter Acquisition Implementations[C]. Proceedings of the IAIN World Congress in association with the U. S. ION Annual Meeting, San Diego, 26-28 June 2000:352-367.
  • 3蔡凡,尹燕,张秀忠.GPS接收机的中频信号处理算法研究[J].天文学进展,2007,25(1):84-95. 被引量:7
  • 4Lei Dong. IF GPS Signal Simulator Development and Verification [D]. [PHD Thesis]. Calgary:The University of Calgary, 2003.
  • 5Altera Corporation. Using MicroC/OS-Ⅱ RTOS with the NiosII Processor Tutorial[M]. California. Altera Corporation, 2004.

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