摘要
针对传统DDS仍有较大误差和杂散的问题,运用三阶DDS模拟高动态卫星信号模拟器中的信号多普勒频移的方法,建立三阶DDS模型,推导了输出相位表达式,分析了各阶累加控制字与卫星信号多普勒之间的对应关系,给出了参数设计准则。仿真结果表明,在高动态环境下,该方法可实现对信号多普勒的高精度模拟。
To avoid the larger error and stray in conventional DDS method,a third-order DDS model is established by using third-order DDS simulating the Doppler shift in the signal of high-dynamic satellite signal simulator.The output phase expression is derived.The corresponding relationships between the designed parameters of DDS and signal Doppler are analyzed,aguide line to choose proper parameters is provided.Simulation results indicate that the signal Doppler simulation is of high precision using this method.
出处
《桂林电子科技大学学报》
2013年第6期443-446,共4页
Journal of Guilin University of Electronic Technology
基金
国家自然科学基金(61062003
61162007
61271284
61261033)
广西自然科学基金(2013GXNSFA019004)
