一种有效的脉内特征分析算法

信号脉内特征分析技术对密集和复杂电磁环境中辐射源的分选和识别有着重要意义。从工程应用的角度出发,提出一种有效的脉内特征分析算法,将多阶相位差分计算得到的瞬时频率特征作为区分调频和调相信号的依据:通过逆序相乘法和瞬时频率直方图统计识别出线性调频和频率编码信号。通过倍频法进一步区分二相编码和四相编码信号,仿真试验表明:该算法在较低信噪比下对常见脉内调制信号具有较好的性能,运算量小,便于硬件实现。

An Effective Algorithm of Intra-pulse Characteristics Analysis

The technique of extracting intra-pulse characteristics from complex electromagnetic environment is very important for the sorting and identification of emitter signals. From the point of view of engineering application, an effective method of intra-pulse characteristics analysis is proposed. The instantaneous frequency calculated by phase difference is used to distinguish between intra- pulse frequency modulation and phase modulation signals. The LFM signal can be identified by inverse-order multiplication,and the fre- quency-coded signal can be estimated by the histogram statistics of instantaneous frequency. Furthermore, the frequency doubling method can be used to distinguish between binary and quartic phase coded signals. Simulation results indicate the validity of the algorithm as well as its high performance and easy implementation.