电视信号的模拟及其模糊函数分析

基于电视信号的无源双(多)基地探测系统是外辐射源探测的一种主要形式。而由于电视图像信号的随机性和复杂性，使得难于找到一种合适的表达方式。本文则是在充分分析、综合了电视图像信号特征的基础上，利用不同幅度、宽度、频率和相位的方波信号相叠加，生成模拟黑白全电视图像信号；并将生成信号经低通滤波器处理，从而最终得到了一个能够充分反映电视图像脉冲性、频率、幅度和带宽特点的较为逼真的信号波形。该信号的形成既保证了图像信号的多样性，同时又保证了相邻行周期信号的相关性；经对其进行的模糊函数及分辨力和与实际采得的图像信号的对比分析来看，基本符合其信号特点的理论分析结果，从而为基于电视信号的外辐射源探测研究向实用化方向又迈出了重要的一步。

SIMULATION FOR TELEVISION SIGNAL AND ANALYSIS FOR ITS AMBIGUITY FUNCTION

The passive bistatic (multistatic) detection system based on television signal is a primary style of extraneous radiator detection. But, it is hard to find a proper means of expression as the randomicity and complexity of television picture signal. On the basis of analysis and colligation for the characteristics of television signal, a simulated black-and-white whole television signal is produced using the rectangular signals with different amplitude, duration, frequency and phase in the paper. After the signal is processed through a low-pass filter, a very realistic waveform is obtained which can show pulsed nature, frequency, amplitude and bandwidth of television picture signals. The signal ensures the variety of television picture signal as well as the correlatability of the signals in adjacent line periods. In view of comparison with the analysis for the ambiguity function and resolution of the simulated signal and real picture signal, the results basically accord with the theoretical analysis for the simulated signal. Thus, it allows the study of extraneous radiator detection based on television signal to take an important step forward to its actual application.