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Low velocity target detection based on time-frequency image for high frequency ground wave radar |
| YAN Songhua, WU Shicai, WEN Biyang |
| School of Electronic Information, Wuhan University, Wuhan 430072, China |
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Abstract The Doppler spectral broadening resulted from non-stationary movement of target and radio-frequency interference will decrease the veracity of target detection by high frequency ground wave (HFGW) radar. By displaying the change of signal energy on two dimensional time-frequency images based on time-frequency analysis, a new mathematical morphology method to distinguish target from nonlinear time-frequency curves is presented. The analyzed results from the measured data verify that with this new method the target can be detected correctly from wide Doppler spectrum.
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Issue Date: 05 December 2007
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