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Volume 30 Issue 7
Jan.  2011
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Shi Jian-feng, Wang Ke-ren. Joint Estimation of Doppler and Multipath Time Delay of Wideband Echoes for LFM Pulse Radar Based on Cyclic Correlation[J]. Journal of Electronics & Information Technology, 2008, 30(7): 1736-1739. doi: 10.3724/SP.J.1146.2006.02049
Citation: Shi Jian-feng, Wang Ke-ren. Joint Estimation of Doppler and Multipath Time Delay of Wideband Echoes for LFM Pulse Radar Based on Cyclic Correlation[J]. Journal of Electronics & Information Technology, 2008, 30(7): 1736-1739. doi: 10.3724/SP.J.1146.2006.02049

Joint Estimation of Doppler and Multipath Time Delay of Wideband Echoes for LFM Pulse Radar Based on Cyclic Correlation

doi: 10.3724/SP.J.1146.2006.02049
  • Received Date: 2006-12-25
  • Rev Recd Date: 2007-07-05
  • Publish Date: 2008-07-19
  • A new method based on cyclic-correlation character for estimating the Doppler and multipath time delay of the wideband echoes for LFM pulse radar by only one pulse signal is presented. First, the Doppler is estimated by energy cumulation of multipath component based on cyclic-correlation transform. Then, an order-reduced signal is reconstructed combining the Doppler with the prior knowledge of the transmitted signal, and the echoes signal is converted to many single-frequency signals. Finally, the multipath time delay is obtained by zero-frequency section cyclic-spectrum where the overlapping echoes can be separated and the resolution is doubled. The method is adapted for low SNR noise, can restrain the affection of the cross-items, and has a high time-delay estimation resolution. Some computer simulations are given in this paper and the results show that the new method is valid.
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  • 田孝华,廖桂生,吴云韬. LFM 脉冲雷达回波Doppler 与多径时延的联合估计. 电子学报, 2002, 30(6): 857-860.Tian X H, Liao G S, and Wu Y T. Joint estimation of Dopplerand multipath time delay of overlapping echoes for LFM pulseradar. Acta Electronic Sinia, 2002, 30(6): 857-860.[2]戴延中,李志舜. 基于Wigner-Ville 分布的宽带回波瞬时多普勒估计方法. 声学学报,2002, 27(2): 137-140.Dai Y Z and Li Z S. Instantaneous Doppler estimation ofwideband echoes based on Wigner-Ville distribution. ActaAcustica, 2002, 27(2): 137-140.[3]刘庆云,李志舜. 基于自适应核时频分布的多普勒频移及多径时延估计. 西北工业大学学报,2004, 22(1): 29-32.Liu Q Y and Li Z S. On improving joint estimation of Dopplerfrequency and multipath time delay of overlapping echoes forLFM pulse sonar. Journal of Northwestern PolytechnicalUniversity, 2004, 22(1): 29-32.[4]Gardner W A. The spectral correlation theory ofcyclostationary time-series. IEEE Trans. on Signal Processing,1986, 11(7): 13-36.[5]Gardner W A. Exploitation of spectral redundancy incyclostationary signals. IEEE Signal Processing Magazine,1991, 8(2): 14-36.[6]Gardner W A. Spectral correlation of modulated signals:PartⅠ-analog modulation[J].IEEE Trans. on Communications.1987, 35(6):584-594[7]Gardner W A and Roberts R S. One-bit spectral-correlationalgorithms[J].IEEE Trans. on Signal Processing.1993, 41(1):423-427
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