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Improvement in detection with forward scattering radar

Science China(Information Sciences) 2011年第12期54卷 2680-2692页

作者： RAJA ABDULLAH Raja Syamsul Azmir RASID Mohd Fadlee A MOHAMED M Khalafa Wireless and Photonics Networks Research Centre Universiti Putra Malaysia Selangor 43400 Malaysia

forward scattering radar (FSR) has advantages over traditional monostatic radar such as an enhanced radar cross section. Enhancement of the radar cross section can increase the detection range of the FSR system. This feature has renewed interest in FSR. The latest development of the FSR system for ground application does not consider a rough environment and there is no advanced signal processing technique for the detection procedure, which have delayed the deployment of FSR. Therefore, this paper analyzes a signal pro- cessing technique that extracts the Doppler signal scattered from a moving target under the influence of ground clutter, receiver noise and surrounding noise. The scattered Doppler signal is processed for target detection. Two methods, namely the use of the Hilbert transform and wavelet technique, are evaluated. Results show that target detection using a Hilbert transform is applicable only for certain conditions but target detection employing the wavelet technique is more robust against clutter and noise. An inclusive comparison of various wavelet threshold selection rules for different types of wavelet filters and levels of decomposition is conducted to study the effect on target detection with FSR. Two sets of field experiments were carried out to validate the proposed method, and target signals under the influence of large clutter were successfully detected using the proposed method with a confidence level exceeding 75%.

关键词： forward scattering radar signal denoising automatic target detection

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Physical modeling and spectrum spread analysis of surface clutter in forward scattering radar

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Science China(Information Sciences) 2010年第11期53卷 2310-2322页

作者： LONG Teng, HU Cheng, ZENG Tao & LI XiaoLiang radar Research Laboratory, Department of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China radar Research Laboratory Department of Electronic Engineering Beijing Institute of Technology Beijing China

In this paper, based on the processing results of measured clutter data in forward scattering radar, a special phenomenon that the clutter spectrum spread is insensitive to the wind speed and carrier frequency is observed. The pendulum model is first time introduced into the physical modeling and formation mechanism analysis of surface clutter, and the quantitative expression of clutter spectrum spread is analytically obtained. Under the assumption of pendulum model, the processing results of measured clutter data agree well with the results of theoretical analysis, which fully verifies the correctness of pendulum model and reveals the formation mechanism of surface clutter spectrum in forward scattering radar. Furthermore, according to the stability of clutter spectrum spread with respect to carrier frequencies and wind speed, the optimal cutofrequencies of clutter filter can be obtained, which establishes the basis for moving target detection and accurate parameters estimation.

关键词： forward scattering radar clutter spectrum pendulum model formation mechanism

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