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△ƒ与对应频谱分辨率△ƒ’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。
关键词:
直接数字式频率合成器,
线性扫频,
频谱,
频率分辨率
Abstract: 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 △ƒ and the relevant frequency spectrum resolution ratio △ƒ’ 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.
Key words:
Direct Digital Frequency Synthesis(DDS),
linear sweep frequency,
frequency spectrum,
frequency resolution ratio
中图分类号:
陶 洪;范蟠果;梁 波. 基于AD9954的单斜率线性调频连续波[J]. 计算机工程, 2008, 34(21): 230-232.
TAO Hong; FAN Pan-guo; LIANG Bo. Linear Frequency-modulated Continuous Wave of Single Slope Based on AD9954[J]. Computer Engineering, 2008, 34(21): 230-232.