摘要
通过对直接数字式频率合成器(DDS)AD9954合成单斜率线性扫频信号进行频谱分析,推导出当扫频控制信号周期参数设置不同时的线扫步进频率Δf与对应频谱分辨率Δf′的关系,通过实验验证了理论推导。并推导出线性调频连续波雷达的距离公式,与经典的模糊函数中距离分辨率公式进行了比较,找出了DDS中影响距离分辨率的参数。
With the frequency analysis results of the single slope linear sweep frequency signals from Direct Digital Frequency Synthesis（DDS） AD9954, the relationship of linear sweep frequency stepper frequency △f and the relevant frequency spectrum resolution ratio △f＇ under different periods of the control signal are got. A distance formula of linear frequency-modulated continuous wave radar is reached, it is compared with the classic distance resolution ratio formula in fuzzy function, and the parameters are determined, which affect distance resolution ratio in DDS.
出处
《计算机工程》
CAS
CSCD
北大核心
2008年第21期230-232,共3页
Computer Engineering
关键词
直接数字式频率合成器
线性扫频
频谱
频率分辨率
Direct Digital Frequency Synthesis（DDS）
linear sweep frequency
frequency spectrum
frequency resolution ratio
