基于非线性调频信号的多相序列设计  

Design of NLFM Signal Based Poly-phase Sequence

作　　者：王庆海[1] 毛士艺[1] 王昌宝[2] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083 [2]中国电子科技集团公司第54研究所,河北石家庄050081

出　　处：《无线电工程》2006年第7期30-32,64,共4页Radio Engineering

摘　　要：用相位逗留原理,给出非线性调频信号的设计方法,对其进行相位离散化,产生多相离散相位序列P(n,k),其中n和k为频域窗函数的参数。P(n,k)随着窗函数的不同,具有不同的主副瓣比PSR。对n=2和4,长度为100的P(n,k)信号进行优化设计,给出具有近似最优的PSR的P(n,k)信号。对主瓣宽度进行理论分析,给出理论上的主瓣宽度的计算方法。P4码信号作为P(n,1)信号,虽然具有最窄的主瓣,但具有较高的距离旁瓣。计算机仿真表明:P(n,k)信号具有比P4信号更强的多普勒鲁棒特性。与前两者比较,FRANK码的多普勒性能最差。The stationary phase theory is used, and the design method of NLFM signal is presented in this paper. The method is that phase idscretization is performed, and poly-phase sequence P （ n, k ） is generated by properly sampling in time domain, where n and k are parameters of frequency domain window function, which are approximations of the energy density function of radar waveform over frequency domain, and have different PSR （peak-sidelobe-ratio） as window function is varied .The optimization design is performed for P（ n, k） singal whose length is 100, n = 2 or 4, and P （ n, k ） signal with almost best PSR is given. The theoretical analysis of main lobe beambeamwidth is perfomed, the theoretical calculation method of main lobe beamwidth is presented. As P （ n, 1 ） signal, P4 code has the narrowest main lobe but higher range side lobe. The computer simulation indicates that doppler robust characteristic of P （ n, k ） signal is more stronger than that of P4 signal. Compared with the above two, doppler characteristic of FRANK code is worst.

关 键 词：线性调频 非线性调频 多相码 自相关函数 匹配滤波 距离旁瓣 

分 类 号：TN911.7[电子电信—通信与信息系统]