摘要
提出了一种用于GPS接收机系统中数控振荡器模块的电路设计。通过Verilog HDL语言完成了NCO的设计,并利用Modelsim软件对其进行仿真。通过采集实时数据测试,验证了该模块可以完成中频载波信号和多普勒的剥离。最后针对数控振荡器的性能指标做了简单分析,对信噪比和杂散度等关键参数测试,使用MATLAB软件对其性能进行仿真,验证其满足接收机的要求。
This paper presents a circuit design for the NCO module in the GPS receiver system. The design of NCO is completed by Verilog HDL language,and the simulation is carried out by Modelsim software. The real-time data acquisition test proves that the module can complete the stripping of IF carrier signal and Doppler. At last,the performance of NCO is also presented a simple analyzed. The key parameters such as signal-to-noise ratio and spurious are tested,and it simulated by MATLAB software to verify that it meets the requirements of the receiver.
出处
《信息技术》
2017年第9期58-61,66,共5页
Information Technology
基金
国家自然科学基金(61661049)
陕西省科技统筹创新工程计划战略性新兴产业重大产品(群)项目(2014KTCQ01-21)
陕西省科技统筹创新工程计划项目(2012KTCQ01-06)
关键词
GPS接收机
载波NCO
正余弦函数查找表
复相位旋转下变频
GPS receiver
carrier NCO
sine and cosine function look-up table
complex phase rotation down-conversion
