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| A High Accurate Method of Estimating Moving Target’s Parameters Using Time-frequency Analysis and Dechirp Technology with Multi-channel |
| Deng Yun-kai① Liu Ya-dong①② Xing Kun① Qi Hai-ming① Chen Qian①② |
| ①Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China ②Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract Traditional approaches, such as the Displaced Phase Center Antenna (DPCA) and Along Track Interferometer (ATI), fail to mitigate the negative impact on the detection of?a target and the estimation of the parameters due to the defocus problem associated with the target’s azimuth velocity. In addition, these two approaches also fall short in estimating the target’s azimuth velocity. To solve above problems, this paper proposes a multi-channel moving target detection method which combines the time-frequency analysis method of Modified Discrete Chirp-Fourier Transformation (MDCFT) and dechirp technology. Through accurately estimating?a moving target's doppler parameters, the proposed method can realize the focusing of?the moving target. As a result, the accuracy of estimation on the moving target’s radical velocity, azimuth position, as well as azimuth velocity can be significantly improved. In all, the proposed method can overcome the disadvantages of the traditional DPCA and ATI approaches, and the e fectiveness of the proposed method is proved through both theoretic analysis and compute simulation.
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Received: 11 February 2010
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Corresponding Authors:
Liu Ya-dong
E-mail: liuyadong_1983@126.com
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2011, Vol. 33 
