基于瞬时频率的LFM信号脉内分析  

Intra-pulse analysis for radar signals based on the instantaneous frequency

作　　者：王娟娟[1] 梁俊杰[1] 钟强[1] 秦绪栋[1] 黄艳[1] 

机构地区：[1]烟台大学,山东烟台264005

出　　处：《电声技术》2016年第9期60-64,共5页Audio Engineering

摘　　要：雷达信号的脉内调制特征分析在雷达侦察系统中充当了一个重要角色,是雷达系统信号处理过程中的一个重要组成部分,在瞬时频率基础上提出了一种快速而有效的脉内分析方法——首先对加入加性高斯白噪声的复信号进行相位解模糊,由测量的相位展开得到信号的真实相位,然后进行N阶相位差分,得到估计的瞬时频率,最后再利用迭代变权最小二乘线性拟合的方法得出对信号瞬时频率的估计曲线。此方法也可完成对起始频率和调频斜率等参数的估计。大量的仿真实验和分析可以验证,提出的方法是可行、有效的,而且在工程上具有良好的应用价值。Intra-pulse modulation and recognition of radar signals plays an important role in the radar reconnaissance system, a fast and effective lntra-pnlse method is put forward based on the instantaneous frequency.Firstly,the fuzz for complex signal what added the additive white Gaussian noise is removed.Meanwhile, the real phase from the measured phase is obtained.Then the instantaneous frequency by Norder phase difference is got.Finally, the weighted least squares linear fit for the phase is made, by this way, the estimation curves of instantaneous frequency can be figured out.In the meantime, this method can also estimate the initial frequency and frequency rate and other parameters.A lot of simulation and analysis can test the method that proposed in this paper is feasible and effective, and has good application in engineering.

关 键 词：瞬时频率 相对无模糊相位重构 相位差分 最小二乘线性拟合 

分 类 号：TN957.51[电子电信—信号与信息处理]