系统工程与电子技术(英文版)
繫統工程與電子技術(英文版)
계통공정여전자기술(영문판)
Journal of Systems Engineering and Electronics
2015年
5期
973-981
,共9页
low probability of intercept (LPI)%integral rotating fac-tor%signal detection%image processing
This paper mainly revolves the time-frequency image of low probability of intercept (LPI) radar signals and carries out research work on image features selection and extraction and recognition. Since Choi-Wil iams distribution (CWD) uses the ex-ponential kernel of bilinear generalized class of time-frequency distribution, it has an excel ent time-frequency aggregation. And it is suitable for detecting LPI radar signals in a low signal-to-noise ratio (SNR) condition. A radial integration method based on the in-tegral rotating factor is proposed to detect LPI radar signals when the signals’ time-frequency image is obtained. First, the digital image processing method is used to preprocess the LPI radar sig-nals’ time-frequency images after CWD transformation; then, the radial integration method based on the integral rotating factor is used to detect LPI radar signals in the binary images. The analytic results of real data show that the method has a good performance on detecting LPI radar signals in a low SNR condition. Additional y, the method is simple and takes less logic resources and has the potential of real-time detection of LPI radar signals.