基于三阶DDS的卫星信号多普勒模拟方法
Satellite Signal Doppler Simulation Method Based on Third-Order DDS
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摘要: 研究基于现场可编程门阵列(FPGA)的高动态卫星信号多普勒模拟方法. 建立了三阶直接数字频率综合(DDS)仿真模型,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,在具有加加速度的高动态环境下,该方法可实现对信号多普勒的高精度模拟.Abstract: The approach to simulate satellite signal Doppler frequency shift in high dynamic condition based on FPGA is investigated. Third-order DDS model is built and its output phase expression is derived. The corresponding relationships between designed parameters of DDS and signal Doppler are analyzed and a guide line to choose proper parameters is provided. Simulation results indicate that using this method to simulate signal Doppler is of high precision in high dynamic motion with jerk.
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