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We analytically evaluate the impact of a mismatch in the signal steering vector on the detection performance of a constant false alarm rate matched filter (CFAR-MF) in white Gaussian noise with unknown noise power. An infinite-sum expression for the detection probability of the CFAR-MF is derived in the mismatched case where the nominal signal steering vector is not aligned with the actual one. This...
Range migration is the basic and troublesome problem in moving target detection for wideband radar. In this paper, we propose a joint-sparse estimation algorithm that gives a sparse representation of migration targets with velocity ambiguity. The proposed algorithm utilizes a non-ambiguous representation of the wideband signals to alleviate the velocity ambiguity, then the estimation of the targets...
Distributed radar sites needs a group of nearly-orthogonal waveforms and polyphase coded waveforms (PCWs) can approach the orthogonality in the code dimension. However, PCWs are sensitive to Doppler mismatch in range compression, which can induce signal-to-noise ratio (SNR) loss and sidelobe level increase. In this paper, we first study how to design a seed PCW with a high Doppler tolerance and then...
For robust classification of moving wheeled and tracked vehicles using returned micro-Doppler signals within short dwell time, the influence of receiver white noise and low spectrum resolution are encountered. In this paper, noise reduction and super-resolution are realized simultaneously via a redundant dictionary based l1 -norm optimization method. Experiments based on the measured data are presented,...
An instantaneous rotation rate (IRR) estimation algorithm based on the chirp rate of the scattering centre in the same Doppler cell is proposed to complete the cross-range scaling of the RID ISAR images.
This paper utilizes empirical mode decomposition to analyze the micro-motion of moving vehicles. Due to the adaptive function of empirical mode decomposition (EMD), different micro-motion of moving vehicles can be extracted by this decomposition technique. The analysis results based on simulated data and measured data show that special structures of different vehicles can be well depicted by EMD.
Micro-Doppler information contained in the returned echo reflects the special structure of moving vehicles and can be utilized to discriminate wheeled vehicle and tracked vehicle. In this paper, generalized matched filter is employed to suppress clutter and a preprocessing is used to eliminate the influence of bulk velocity for Doppler spectrum firstly. Then features which depict the distinction between...
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