摘要
卫星导航系统中的导航信号产生器有时延调整的要求,而且时延调整精度很高,调整范围也很大。通过比较几种时延调整方案,提出了一种使用FPGA+DDS来调整时延的方案,通过控制DDS初始相位,调整后的正弦波经过过零检测比较器转换为TTL时钟信号,送入伪码生成模块达到对码钟进行微小时延调整的目的。经实际工程应用并测试,时延调整精度可达0.1 ns。
Navigation signal generator has requirement on delay adjustment,especially critical on the delay adjustment precision with large adjustment range. Comparison of several delay adjustment solutions is performed. A scheme of DDS ＋ FPGA is proposed. The DDS initial phase is controlled and the adjusted sine wave pass through the comparator for zero cross detection for conversion into TTL clock signal, which is sent into the pseudo-code generation module to achieve fine adjustment on the clock minute delay. Test results and practical engineering show that the adjustment precision can reach 0.1 ns.
出处
《无线电工程》
2013年第10期13-15,共3页
Radio Engineering
基金
国家高技术研究发展计划(863计划)(2011BAH05B01
2011BAH05B02)资助项目
关键词
卫星导航
信号产生
时延调整
延迟线
satellite navigation
signal generator
delay adjustment
delay line
