基于FM-AM转换的伪码调相-载波调频复合引信信号的脉内特征提取研究

伪码调相和载波调频复合信号因具有好的距离、速度分辨率和测速测距精度,所以广泛应用在雷达和引信中。在电子对抗中为了实施欺骗性干扰,必须有效地提取复合信号的参数特征,为此本文研究了FM-AM转换时频分析的理论及其实现方法,并利用该方法对伪码调相-载波调频复合信号进行了脉内特征分析。具体包括伪码调相正弦载波信号、伪码调相复合正弦调频信号及伪码调相复合线性调频信号。仿真结果表明,在信噪比为5dB时,利用FM-AM转换时频分析技术,不但可以提取载波调频的特征信息,而且能够有效提取伪码的特征信息。

The Study on In-pulse Characteristics Extraction of Pseudo Code Phase Modulation-Carry Frequency Modulation Combined Fuse Signal Based on the FM-AM Transduction Analysis

When the pseudo code phase modulation and the carry frequency modulation combined signal is used to measure the distance and velocity,both the resolution and the precision are high.So this kind of signal is used in such field as radar and fuze widely.In the electronic countermeasure,the feature parameter of this signal must be extracted effectively in order to implement the cheat jamming.The theory and implementation on the FM-AM transduction analysis are introduced in this paper.This method is used to analysis the in-pulse characteristics of pseudo-code fuse signals such as pseudo-code phase modulation,pseudo-code phase modulation combined by sinusoid frequency modulation and pseudo-code phase modulation combined by linear frequency modulation.The simulation result shows that both the characteristic of carry signal and phase changed position caused by the pseudo-code can be extracted effectively in SNR=5dB.