摘要
间歇采样噪声调制转发式的灵巧噪声干扰向来是雷达干扰对抗的难点。在深入研究间歇采样转发干扰(interrupted-sampling repeater jamming,ISRJ)的基础上,针对ISRJ时域不连续采样的特点,提出一种基于脉内步进线性调频(linear frequency modulation,LFM)波形的抗ISRJ方法。该方法利用脉内步进LFM子脉冲之间的正交性互相掩护,子脉冲间频率步进使得干扰采样段经调制后仍无法干扰相邻子脉冲,从而可以有效提取干扰机没有采样的信号段,在对抗高占空比的重复转发干扰时优势明显。仿真条件下,干扰采样与发射波形分段非同步时,窄子脉冲较宽子脉冲输出信干噪比提高约3.1dB。
The smart noise interference of intermittent sampling noise modulation and forwarding is always difficulty in radar interference countermeasures based on the analysis of the interrupted-sampling repeater jamming (ISRJ) principle. ISRJ is discontinuous in time domain. An anti ISRJ method based on the stepped linear ferquency modulation (LFM) waveform is proposed. This method utilizes the sub-pulses’ orthogonality to cover each other. The frequency stepping between sub-pulses makes it impossible to interfere with the adjacent sub-pulses after the interference sampling segment is modulated, so that the signal segment without sampling of the jammer can be effectively extracted, which has obvious advantages in the counter against repeated forwarding interference with high duty ratio. Under the simulation condition, when interference sampling and transmitting waveform are out of step, the output signal-to-jamming plus noise ratio of the narrow sub-pulse is about 3.1 dB higher than that of the wide sub-pulse.
作者
张建中
穆贺强
文树梁
李彦兵
ZHANG Jianzhong;MU Huqiang;WEN Shuliang;LI Yanbing(Beijing Institute of Radio Measurement, Beijing 100854, China)
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2019年第5期1013-1020,共8页
Systems Engineering and Electronics
关键词
间歇采样
脉内步进
窄带滤波器组
抗干扰方法
interrupted sampling
intra pulse stepped
narrow band filter group
anti jamming method
