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Combining Radon-ambiguity transform with second-order difference to improve detection probability of LFM signals in low SNR 被引量:4
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作者 tan xiaogang wei ping li liping 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2009年第1期13-19,共7页
The Radon-ambiguity transform (RAT), although efficient for detecting the linear frequency modulated signals (LFMs), is troubled by the energy accumulation of noise in low signal-to-noise ratio (SNR). A secondor... The Radon-ambiguity transform (RAT), although efficient for detecting the linear frequency modulated signals (LFMs), is troubled by the energy accumulation of noise in low signal-to-noise ratio (SNR). A secondorder difference (SOD) method is proposed to treat with this problem. In the SOD method, the optimal search step and difference step are derived from the LFM rate resolution formula. The sharpness of the peaks of RAT is measured by curvature, and the sharpness, but not the magnitude of the peaks, is used to detect the LFMs. The SOD method removes the noise energy accumulation and reserves the drastically changing components integrally; thus, it improves the detection probability of LFMs in low SNR. The expected performance of the new method is verified by 100 Monte Carlo simulations. 展开更多
关键词 linear frequency modulated signals Radon-axnbiguity transform detection probability low signal-to-noise ratio.
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Improvement on polynomial Wigner-Ville distribution for detecting higher-order polynomial phase signal 被引量:4
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作者 tan xiaogang wei ping li liping 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2009年第2期234-240,共7页
To detect higher order polynomial phase signals (HOPPSs), the smoothed-pseudo polynomial Wigner-Ville distribution (SP-PVCVD), an improved version of the polynomial Wigner-Ville distribution (PVCVD), is presente... To detect higher order polynomial phase signals (HOPPSs), the smoothed-pseudo polynomial Wigner-Ville distribution (SP-PVCVD), an improved version of the polynomial Wigner-Ville distribution (PVCVD), is presented using a separable kernel. By adjusting the lengths of the functions in the kernel, the balance between resolution retaining and interference suppressing can be adjusted conveniently. The proposed method with merits of interference terms reduction and noise suppression can provide time frequency representation of better readability and more accurate instantaneous frequency (IF) estimation with higher order SP-PVfVD. The performance of the SP-PWVD is verified by computer simulations. 展开更多
关键词 signal processing polynomial Wigner-Ville distribution polynomial phase signal instantaneous frequency estimation
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