摘要
数字频率源是现代雷达系统的重要组成部分,其技术指标直接影响系统的性能。介绍了直接数字合成频率源DDS的基本工作原理及定性分析了其固有杂散和相位噪声形成原因,详细分析了步进频率雷达获取高分辨目标距离剖面(一维距离像)原理。基于MATLAB仿真证明了DDS因相位截断和幅度量化产生的杂散服从均匀随机统计分布特性,仿真了服从均匀随机统计分布特性的DDS杂散对步进频率雷达距离测量性能的影响。分析和仿真的结果对系统设计具有一定的参考价值。
Digital frequency source is an important component of modern radar system, and its technological specifications influence the system performance directly. This paper introduces the fundamental principles of the direct digital synthesized frequency source, qualitatively analyses the inherent spurious effects and phase noise, and analyses the principle by which the stepped -frequency radar obtains high resolution target range profile information （one dimension range image）. The simulation based on Matlab demonstrates that the DDS spurious effects caused by phase truncation and amplitude quantization obey the characteristic of uniform random statistical distribution, and the influence of DDS spurious effects on stepped - frequency radar＇s ranging performance is simulated. The result of analysis and simulation reference value to system design.
出处
《计算机仿真》
CSCD
2008年第12期17-20,共4页
Computer Simulation
