线性调频雷达全相参技术  

Full coherent technology of linear frequency modulation radar

作　　者：杜仕雄[1] 田殷[1] 杨杰[1] 杨光[1] 孙敏[1] 宋烨曦[1] 李宪军[1] DU Shixiong;TIAN Yin;YANG Jie;YANG Guang;SUN Min;SONG Yexi;LI Xianjun(Sichuan Jiuzhou Electric Group Co.,Ltd,Mianyang Sichuan 621000,China)

机构地区：[1]四川九洲电器集团有限责任公司,四川绵阳621000

出　　处：《太赫兹科学与电子信息学报》2018年第5期821-824,共4页Journal of Terahertz Science and Electronic Information Technology

摘　　要：在线性调频雷达系统中,若发射机输出的脉冲信号起始相位是不相参的,则接收机不能根据回波信号解调出准确的多普勒参数。引入了前导帧序列,以控制直接数字合成(DDS)输出信号的相位初始化,从而实现最终输出脉冲信号起始相位与参考时钟相参。该方法简单实用,仅需更改FPGA程序,无需对硬件电路做任何改动。实验结果验证了该方法的有效性。In linear frequency modulation system,the receiver cannot demodulate the Doppler parameter correctly based on the return signal if the initial phase of the transmitter output is not coherent.A prior frame sequence is introduced to realize the coherence between the initial phase of the output pulse signal and the reference clock by initializing the Direct Digital Synthesis(DDS)’s phase accumulator.The proposed method is simple and practical,because it just only needs to modify the FPGA program without any changes to the hardware circuit.The effectiveness of the method has been verified by the experimental results.

关 键 词：前导帧 全相参 直接数字合成 线性调频 

分 类 号：TN74[电子电信—电路与系统]