NDLI: Unambiguous velocity estimation method based on intra-pulse cross-correlation

Content Provider	IET Digital Library
Author	Zhang, Yunjian Pan, Pingping Fu, Maozhong Deng, Zhenmiao Zhang, Yixiong Liu, Hui
Abstract	In this study, by employing the intra-pulse cross-correlation (IPCC) operation, an unambiguous velocity estimation method is proposed for narrow-band long-range radars with high carrier frequency and low pulse repetition frequency. This estimation algorithm is simple and could be easily implemented in existing radar systems without changing the radar hardware or the pulse transmitting scheme. Comparing with the slow time dimension correlation algorithm, the accuracy of the proposed intra-pulse frequency domain method is greatly improved, and the brute-force search for the unknown motion parameters is also unnecessary. By first setting a small frequency offset of the IPCC operation, the unambiguous velocity region could be significantly enlarged. Using the relatively coarse but unambiguous estimates and increasing the frequency offset step by step, the IPCC is repeatedly applied to obtain more accurate estimates. Note that the estimation results of the IPCC algorithm could be used in the maximum-likelihood estimator for ambiguity resolution. The Cramér-Rao bound for the proposed algorithm is derived, and the optimal frequency offset in the sense of estimation accuracy is also analysed. Through numerical simulations for both synthetic and real radar data, the effectiveness of the proposed estimation algorithm is verified.
Starting Page	879
Ending Page	886
Page Count	8
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 6, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2019.0441
Journal	IET Radar, Sonar & Navigation
Publisher Date	2020-02-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Brute-force Search Combinatorial Mathematics Correlation Method Cramer-Rao Bound Estimation Accuracy Estimation Algorithm Frequency Domain Analysis High Carrier Frequency Intra-pulse Cross-correlation Operation Intra-pulse Frequency Domain Method IPCC Algorithm Low Pulse Repetition Frequency Mathematical Analysis Maximum Likelihood Estimation Maximum-likelihood Estimator Motion Parameter Narrow-band Long-range Radars Optimal Frequency Offset Pulse Transmitting Scheme Radar Equipment Radar Hardware Radar Signal Processing Radar System Search Problem Signal Processing And Detection Statistics System And Application Unambiguous Velocity Estimation Method Unambiguous Velocity Region
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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