摘要
针对脉冲压缩信号和周期调制连续波信号模糊函数的不同,研究伪码与线性调频复合调制(PN-chirp)信号的模糊函数特性,分析其脉冲压缩信号和周期调制连续波信号的模糊函数。推导了PN-chirp脉冲压缩信号的模糊函数,对其距离、速度自相关函数分别进行了分析讨论;给出PN-chirp连续波信号的周期模糊函数表达式,分析其单周期模糊函数及周期模糊函数的特性,并与脉冲压缩信号模糊函数做分析比较。仿真分析表明,它们具有不同的模糊函数和距离自相关函数,连续波信号在测距时会出现距离模糊;而PN-chirp脉冲压缩信号的速度自相关函数和PN-chirp连续波的单周期速度自相关函数相同,但连续波信号的周期速度自相关函数具有更好的多普勒分辨力。
The ambiguity functions （AF） of combination of chirp modulation and pseudonoise phase modulation （PN-chirp） pulse signal and continuous wave were analyzed for the different properties of AFs for finite-duration signals and periodic continuous wave radar signals. Firstly, the AF of PN-chirp pulse was deduced, and the cuts along the delay axis and Doppler axis were discussed respectively. Then the periodic AF of PN-chirp continuous wave was given for analyzing the properties of single-period AF and periodic AF. At the same times, the AFs of PN-chirp pulse and continuous wave were contrasted to show the difference between the two signals. Simulation results show that they have different AF and delay autocor- relation function, which demonstrates that the range ambiguity may appear in PN-chirp continuous wave type detectors; the Doppler autocorrelation function of PN-chirp pulse signal and the single-period Doppler autocorrelation of PN-chirp continuous wave are the same, however, the periodic Doppler autocorrelation shows a better velocity resolution.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2011年第10期1217-1222,共6页
Acta Armamentarii
基金
国家部委项目(9140A05040510BQ0201)
江苏省普通高校研究生科研创新计划项目(CX10B_126Z)
关键词
信息处理技术
伪码调相
线性调频
模糊函数
自相关函数
information processing
pseudonoise phase modulation
chirp
ambiguity function
autocor-relation function
