CAJ | 학술논문

低截获概率（LPI）雷达的广泛应用导致电子侦察系统难以从噪声中检测到LPI信号的存在。针对这一问题，提出一种基于多相滤波器组和高阶累积量联合处理的121雷达信号检测算法。该算法首先利用多相滤波器组实现信号在频域上的快速均匀划分，然后对输出的每个子带信号进行三阶累积量对角切片短时估计，有效抑制高斯噪声，并设计检测器对每个子带信号进行信号存在性检测，进而判断整个信号中是否含有有用信号。仿真结果表明，该方法的检测性能远优于传统的能量检测器，在信噪比大于-20dB时具有较高的检测概率。
저절획개솔（LPI）뢰체적엄범응용도치전자정찰계통난이종조성중검측도LPI신호적존재。침대저일문제，제출일충기우다상려파기조화고계루적량연합처리적121뢰체신호검측산법。해산법수선이용다상려파기조실현신호재빈역상적쾌속균균화분，연후대수출적매개자대신호진행삼계루적량대각절편단시고계，유효억제고사조성，병설계검측기대매개자대신호진행신호존재성검측，진이판단정개신호중시부함유유용신호。방진결과표명，해방법적검측성능원우우전통적능량검측기，재신조비대우-20dB시구유교고적검측개솔。
For the problem thin the low probability of intercept （LPI） radar sigral is difficult to be in- tercepted by the current electronic reconnaissance systems, a novel detection method of LPI radar sig- nal based on the polyphase fiher banks and high-order cumulants is proposed. The input signal is splitinto many narrow frequency bands by polyphase filter banks rapidly, and Gaussian noises can be sup- pressed using the short-time estimation of the third-order cumulant on each narrow frequency bands. Detector is designed to detect the LPI radar signal. Finally simulation results illustrate that the perfor-mance of new methods is better than energy detector and have high detection probability when SNR is more than - 20dB.