相位编码调频步进信号及其性能分析  

Phase Coded Chirp Frequency-Stepped Signal and Analysis of Its Characteristic

作　　者：韩俊[1] 陆晓飞[1] 吕明久[1] 冯明月[1] HAN Jun;LU Xiaofei;LYU Mingjiu;FENG Mingyue(Air Force Early Warning Academy,Wuhan 430019,China)

机构地区：[1]空军预警学院,湖北武汉430019

出　　处：《雷达科学与技术》2018年第4期371-377,共7页Radar Science and Technology

基　　金：湖北省自然科学基金(No.2016CFB288)

摘　　要：针对步进频率波形数据率低、运动补偿难度大的问题,提出了一种新的相位编码调频步进信号(PC-CFS)。新信号在相位编码步进信号的基础上,通过对每个子码进行Chirp调制,在保持子脉冲时宽不变的情况下,增大了载频步进量,减小了子脉冲个数,提高了信号的数据率。在推导新信号模糊函数的基础上,着重分析了其距离、多普勒分辨性能,并在性能比较中得出该信号具有较好的距离、多普勒联合分辨能力,大大降低了运动补偿难度,且信号的低截获、抗干扰性能也得到进一步提升的结论。Considering the problem that stepped-frequency waveform has low data rate and great difficulty in motion compensation,a novel phase coded chirp frequency-stepped signal(PC-CFS)is proposed.The novel signal is based on phase coded frequency-stepped signal with each sub-code chirp modulated.As a result,with the same sub-pulse width,the step size of carrier frequency is increased,the number of sub-pulses is reduced and the data rate is increased.Then the paper analyses the range resolution and Doppler resolution performances of the novel signal by deducing its ambiguity function.Analysis results show that the novel signal has better range resolution and Doppler resolution and lower difficulty in motion compensation.What s more,the novel signal also has low probability of interception and good anti-jamming ability.

关 键 词：相位编码调频步进信号(PC-CFS) 距离分辨性能 多普勒分辨性能 模糊函数 成像处理 

分 类 号：TN957.52[电子电信—信号与信息处理]