摘要
分析了异步干扰的成因及处理措施,并提出一种基于信号处理的异步干扰剔除方法。该算法利用异步干扰的奇异性,对输入信号进行脉冲对消、CFAR处理。根据信号既往信息,建立距离杂波图。根据距离杂波图进行门限检测。对所有过门限信号采用逻辑法将奇异值所在脉冲及距离单元定位出来。对检测出来的对奇异值,使用相邻信号进行插值替换,既保留了信号的真实成份,又消除了异步干扰。该算法处理延时小。该算法已在FPGA上实现,并在某雷达中得到了很好的应用,具有很强的工程实用性。
The paper puts forward a method for spike elimination. The algorithm makes use of spike＇s singular characteristics, and introduces pulse cancellation, CFAR, and thresholds crossing method for spike＇s location both in range domain and in pulse domain. Spikes are substituted by interpolated value of adjacen＇s signal data. Spikes are removed, while signals keep integrity. Only two pulses delay is introduced during pro cessing. The method＇s simple procedure makes it easy for practical implementation. The algorithm, based on FPGA chips, has been applied to a radar with satisfying result.
出处
《雷达科学与技术》
2011年第6期556-560,567,共6页
Radar Science and Technology
关键词
异步干扰
奇异值剔除
距离杂波图
谱分析
asynchronous interference
singular value elimination
range clutter map
spectrum analysis
