伪码与线性调频复合调制信号分析

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...

The Analysis of Combination of Chirp Modulation and Pseudonoise Phase Modulation Signal

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 autocorrelation 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.