DDS可实现的宽带线性调频信号延时补偿技术  

Wideband LFM Signal Delay Compensation Technique Based on DDS Chip

作　　者：朱亮[1] 张卫清[1] 

机构地区：[1]中国电子科技集团公司第38研究所,合肥230088

出　　处：《火控雷达技术》2016年第3期47-51,共5页Fire Control Radar Technology

摘　　要：对于多通道宽带线性调频信号发射波束的空间合成,传统的相位控制方法由于孔径渡越问题限制了发射信号的带宽。针对这一问题,本文对线性调频信号延时表达式进行分析,得到需要补偿的部分,并基于Matlab仿真结果,根据一定的评估标准,得出几种补偿方法的适用范围及优缺点,提出一种DDS芯片可实现的宽带线性调频信号的延时补偿技术。结合DDS芯片的具体指标,推导出DDS芯片可以达到的延时精度的表达式,为将来基于DDS芯片的宽带线性调频信号发射波束的空间合成技术提供理论基础。For spatial synthesis of a multi-channel wideband （WB） linear frequency modulated （LFM） signal trans- mit beams, traditional phase control method has limited the bandwidth of the transmit signal due to the aperture transition. To solve this problem in this paper, we analyze the delay expression of the LFM signal and get the part of the compensation. Based on the MATLAB simulation results and some evaluation criteria, we compare several compensation methods and propose a delay compensation technique for DDS chip. Combined with the specific para meters of DDS chip, the expression of delay precision of this method can be reached. This method will provide the theoretical basis for spatial synthesis technology of WB-LFM signal transmit beams.

关 键 词：宽带 线性调频信号 相位补偿 频率补偿 

分 类 号：TN958[电子电信—信号与信息处理]