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| Estimation of Doppler Rate Based on Time-chirp Distribution |
| Wang Jin-zhen Su Shao-ying Chen Zeng-ping |
| ATR Key Laboratory of Defense Science and Technology, National University of Defense Technology, Changsha 410073, China |
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Abstract Based on the analysis of the instantaneous phase characteristics of the echo Linear Frequency Modulated (LFM) signals respectively from single and multiple scatter point targets, an algorithm of the Doppler chirp’s estimation based on the Time-Chirp Distribution (TCD) of echo LFM signals from targets is proposed, in which the projection integral vertical to the chirp axis is adopted to enhance the Doppler chirp’s term of the TCD, but to suppress non-Doppler chirp’s cross term of the TCD and noise. Simultaneously, two-time search method is taken to obtain the maximum value of the TCD’s projection integral to guarantee the estimation accuracy of the Doppler chirp and effectively reduce the amount of computation. The theoretical analysis shows that the time-consuming of calculation can be controlled to the minimum in the appropriate search step. Simulation results show the effectiveness of this method that it has higher estimation accuracy and good immunity for noise.
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Received: 21 January 2015
Published: 25 June 2015
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Corresponding Authors:
Wang Jin-zhen
E-mail: wjz_nudt@163.com
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