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。
The distance and velocity indexes of LFMCW（Linear Frequency Modulation Continous Wave） radar are put forward by analysing the relationship between safe distance and relative velocity of automobile. According to the measurement range and resolution requirement, the signal processing indexes are constituted. The restrictions between radar front ends parameters and measurement indexes and signal processing technical parameters are analysed. Ranges of beat frequency and Doppler frequency and their coupling relation are discussed, and the condition and relation that central frequency and modulation frequency need to meet are discussed. The relation between measurement resolution and frequency resolution is analysed under time-frequency analysis. Key parameters are mediated and modified, CZT algorithm is adopted to optimize signal processing parameters. The method and steps of constituting radar system parameters are provided. The method can establish LFMCW radar system parameters exactly and quickly.
出处
《电讯技术》
北大核心
2011年第7期77-80,共4页
Telecommunication Engineering
基金
河南省2009年科技发展计划项目(092102210146)~~
