摘要
UWB雷达LFM信号源的设计是UWB雷达系统设计的关键技术之一,其信号质量直接影响UWB雷达的整体探测性能。针对基于DDWS方法的“I/Q基带数字产生+正交调制+倍频”方式的UWB-LFM信号产生器,从频域角度建立误差信号的数学模型;分析系统误差提取和补偿的可行性,并提出一种针对系统误差的数字预失真校正方法。该方法将系统失真的补偿函数特性等效到系统数字输入端,通过改变波形存储器中的样点数据实现系统失真的校正和补偿。仿真结果表明该方法可以显著改善UWB雷达LFM信号的质量,验证了该方法的可行性、正确性和有效性。
The design of ultra-wideband(UWB)radar linear frequency modulation(LFM)generator is one of the key technologies in the design of UWB radar system,because its signal quality directly affects the overall detection perform-ance of UWB radar.In this paper,a mathematical model of error signals is proposed in frequency domain for the UWB-LFM signal generator which is implemented by utilizing I/Q baseband digital generation,quadrature modulation and fre-quency multiplication approach on the basis of direct digital waveform synthesis(DDWS)method.The feasibility of the system error extraction and compensation is analyzed,and a digital pre-distortion correction method for the system error is proposed.This method maps the system distortion compensation function characteristics to the system digital input,and realizes the system distortion correction and compensation by modifying the sampled data stored in the waveform memory.The simulation results show that this method can significantly improve the quality of the UWB radar LFM sig-nal,and verify the feasibility,correctness and effectiveness of the proposed method.
作者
胡仕兵
陈子为
HU Shibing;CHEN Ziwei(College of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China)
出处
《成都信息工程大学学报》
2023年第4期414-421,共8页
Journal of Chengdu University of Information Technology
基金
成都信息工程大学大学生创新创业训练计划项目(202210621118)
2021年成都信息工程大学电子工程学院教学改革项目。
关键词
UWB雷达
LFM信号产生器
频域幅相误差
误差校正
数字预失真
匹配滤波
UWB radar
LFM signal generator
amplitude and phase error in frequency domain
error correction
digital pre-distortion
matched filtering
