The purpose of this article is to supply some groundwork from theory and practice for increasing energy efficiency of jam. The background of front copy jamming is presented. Point to binary phase code radar, for basic components of smart noise jamming and front copy jamming, the signal amplitudes output from matching filter are analysed. Outputting pulses from matching filter with the same number and the same amplitude is used as energy efficiency standard, and than the calculation expressions of needed jamming signal energy for the two jamming forms are given. Under typical conditions, needed jamming signal energies for the two jamming forms are calculated. Under general conditions, the energy efficiencies of the two jamming forms are compared with each other. It is pointed out that if the width of the front waveform is 1/n of the width of the radar transmitted signal, the energy efficiency of front copy jamming is 1/n of that of the smart noise jamming.%针对提高干扰的能量利用效率提供一些理论和技术问题,介绍了前沿复制干扰的产生背景.对二相编码雷达、灵巧噪声干扰和前沿复制干扰的基本成分通过匹配滤波器后的输出信号脉冲峰值进行了分析.以在匹配滤波器输出端产生相同数量和相同幅度大小的脉冲为能量利用效率比较基准,给出了这两种干扰方式各自所需的干扰信号能量的计算公式,并进行了典型条件下,这两种干扰方式所需干扰信号能量的数值计算；在一般情况下,对这两种干扰方式的能量利用效率进行了比较.指出若前沿波形宽度为雷达发射信号宽度的1/n,则前沿复制干扰所需能量为灵巧噪声干扰所需能量的n倍,前沿复制干扰的能量利用效率仅为灵巧噪声干扰的能量利用效率的1/n.
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