High Accuracy Velocity Measurement Based on Keystone Transform Using Entropy Minimization

Velocity measurement is a basic task of radars.The target velocity is usually estimated according to the Doppler frequency shift.While traditional Doppler methods are unsuitable for high-speed targets,since the serious range migration between adjacent echoes causes phase wrapping.The serious range m...

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Bibliographic Details
Published in:Chinese Journal of Electronics 2016-07, Vol.25 (4), p.774-778
Main Authors: Dai, Zuoning, Zhang, Xinggan, Fang, Hui, Bai, Yechao
Format: Article
Language:English
Subjects:
ambiguity degree
ambiguous Doppler frequency
echo
Entropy minimization
high accuracy velocity measurement
Keystone transform
Keystone变换
minimum entropy methods
Range migration
slow time
target velocity
transforms
Velocity measurement
传统方法
形变
最小化
最小熵
速度估计
速度测量
高精度
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Summary:Velocity measurement is a basic task of radars.The target velocity is usually estimated according to the Doppler frequency shift.While traditional Doppler methods are unsuitable for high-speed targets,since the serious range migration between adjacent echoes causes phase wrapping.The serious range migration also interferes the coherent integration to improve the accuracy of the velocity estimation.A velocity measurement method based on Keystone transform using entropy minimization is studied to solve this problem.This method applies Keystone transform to the echo to calculate the ambiguity degree with the help of entropy minimization.The proposed algorithm estimates the ambiguity degree with no error at a wider range of SNR than the traditional method.The ambiguous Doppler frequency is obtained according to the slow time.Theoretical analyses and simulations show that this method has very high precision.
ISSN:1022-4653
2075-5597
DOI:10.1049/cje.2016.06.009