摘要: |
通过分析汽车间相对速度和安全距离的关系,提出线性调频连续波(LFMCW)雷达距
离和速度测量指标。根据测量范围及分辨率要求,制定了信号处理指标。分析了雷达前端工
作参数与测量指标及信号处理技术参数间的制约关系。通过分析差拍频率和多普勒频率的范
围
及耦合关系,讨论了前端中心频率和调频频率应满足的关系。通过时频分析研究了测量
分辨率指标与频域分辨率间的关系。协调修订关键参数,采用CZT算法优化信号处理过程。
给
出了系统参数制定的方法和步骤,该方法可准确快速制定LFMCW雷达系统工作参数。 |
关键词: 汽车防撞 线性调频连续波雷达 工作参数 CZT算法 优化设
计 |
DOI: |
|
基金项目:河南省2009年科技发展计划项目(092102210146) |
|
Parameters Optimized Design of Automobile Anti-collision Millimeter Wave Radar System |
ZHOU Gang,WU Jie |
(Department of Electrical Engineering,Henan University of Technology,Zhengzhou 450007,China) |
Abstract: |
The distance and velocity indexes of LFMCW(Linear Frequency Modulation Continous
Wave) radar are put f
orward by analysing the relationship between safe distance and relative velocity
of automobile. According to the measurement range and resolution requirement, t
he signal
processing indexes are constituted. The restrictions between radar front ends p
arameters and measurement indexes and signal processing technical parameters ar
e analysed. Ranges of beat frequency and Doppler frequency and their coupling re
lation are discussed,and the condition and relation that central fre
quency and modulation frequency need to meet are discussed. The relation betwe
en measurement resolution and frequency resolution is analysed under timefrequ
ency analysis. Key parameters are mediated and modified, CZT algorithm is adopt
ed to optimize signal processing parameters. The method and steps of constitutin
g radar system parameters are provided. The method can establish LFMCW radar
system parameters exactly and quickly. |
Key words: automobile anti collision LFMCW radar working parameter CZT algorithm optimiz
ed design |