Estimation of Doppler Rate Based on Time-chirp Distribution

Wang Jin-zhen; Su Shao-ying; Chen Zeng-ping

doi:10.11999/JEIT150116

Volume 37 Issue 9

Sep. 2015

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Article Navigation > Journal of Electronics & Information Technology > 2015 > 37(9): 2138-2143

Wang Jin-zhen, Su Shao-ying, Chen Zeng-ping. Estimation of Doppler Rate Based on Time-chirp Distribution[J]. Journal of Electronics & Information Technology, 2015, 37(9): 2138-2143. doi: 10.11999/JEIT150116

Citation:

Wang Jin-zhen, Su Shao-ying, Chen Zeng-ping. Estimation of Doppler Rate Based on Time-chirp Distribution[J]. Journal of Electronics & Information Technology, 2015, 37(9): 2138-2143. doi: 10.11999/JEIT150116

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Estimation of Doppler Rate Based on Time-chirp Distribution

doi: 10.11999/JEIT150116

Received Date: 2015-01-21
Rev Recd Date: 2015-03-13
Publish Date: 2015-09-19

Abstract

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 chirps 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 chirps term of the TCD, but to suppress non-Doppler chirps cross term of the TCD and noise. Simultaneously, two-time search method is taken to obtain the maximum value of the TCDs 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.
- Signal processing,
- Target echo,
- Multiple scatter point,
- Linear Frequency Modulated (LFM),
- Doppler chirp,
- Time-Chirp Distribution (TCD)

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