摘要
首先建立了进动锥体目标的雷达回波模型,推导了目标微多普勒频率与进动参数的定量关系。针对进动目标雷达回波具有的多分量非线性调频特点,提出了通用复时频分布(generalized complex-time-frequency distribution,GCD)的微多普勒提取方法,与线性和二次Cohen类时频分布相比,GCD具备高时频分辨力、低交叉项的优点。同时针对峰值估计微多普勒瞬时频率(instantaeous frequency,IF)方法受信号频率交叉覆盖和噪声干扰严重的问题,提出基于Viterbi算法的微多普勒IF估计方法,有效提高了微多普勒IF估计精度。实验中利用仿真和暗室测量数据验证了GCD-Viterbi方法的性能。
The radar signal model of cone targets with precession is provided,which can develop the relationship between micro-Doppler and precession parameters.Due to the characteristics of nonlinear frequency modulated and multi-components in radar signal,generalized complex-time-frequency distribution（GCD） is introduced to analyze the micro-Doppler of targets with precession,which has better concentration and time-frequency resolution compared with that of classical time-frequency distributions.Moreover,the estimation algorithm of micro-Doppler instantaneous frequency based on GCD and Viterbi method is proposed to reduce the effect of cross-term artifacts and noise,as well as improve the estimating precision.The performance of the estimation algorithm is validated with simulated data and radar data.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2011年第7期1462-1467,共6页
Systems Engineering and Electronics
基金
国家自然科学基金(60872134)资助课题
关键词
微多普勒
进动
复时频分布
瞬时频率
micro-Doppler
precession
generalized complex-time-frequency distribution
instantaneous frequency
