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12 results on '"SHI Long-fei"'

6. Detection-Discrimination Method for Multiple Repeater False Targets Based on Radar Polarization Echoes

Author

Zong, Zhi-wei, Shi, Long-fei, Li, Yong-zhen, and Wang, Xue-song

Subjects
polarization, Multiple repeat false targets, DRFM, target discrimination, jammer, radar
Abstract

Multiple repeat false targets (RFTs), created by the digital radio frequency memory (DRFM) system of jammer, are widely used in practical to effectively exhaust the limited tracking and discrimination resource of defence radar. In this paper, common characteristic of radar polarization echoes of multiple RFTs is used for target recognition. Based on the echoes from two receiving polarization channels, the instantaneous polarization radio (IPR) is defined and its variance is derived by employing Taylor series expansion. A detection-discrimination method is designed based on probability grids. By using the data from microwave anechoic chamber, the detection threshold of the method is confirmed. Theoretical analysis and simulations indicate that the method is valid and feasible. Furthermore, the estimation performance of IPRs of RFTs due to the influence of signal noise ratio (SNR) is also covered.

Published
2014

12. The DOA Measurement Method of Non-Uniform Array Based on the Radial-Symmetrical Binary Antenna.

Author

SHI Long-fei, WANG Wei, ZHAO Yan, REN Ji-zhong, and GU Ming-chao

Subjects
*ANTENNAS (Electronics), *ELECTROMAGNETIC waves, *POLARIZATION (Electricity), *ALGORITHMS, *REFRACTION (Optics)
Abstract

The non-uniform array made up of different-direction antennas has unique advantages for the DOA measurement of radiant point, and it has been widely used in ELINT. Because of the transmission factors of multipath transmission and ionospheric refraction, more and more elliptic polarized signals present to ELINT applications. The existing DOA measurement method of the non-uniform array can't be applied for the elliptic polarized signals because of the DOA measurement bias. The influence mechanism of the electromagnetic wave polarization and antenna polarization on the DOA measurement is studied in this paper, and a DOA measurement method based on the radial symmetry of two elements array of the non-uniform array is proposed, which is capable of measuring DOA of arbitrary polarization signal. It is great significant to the development of non-uniform array technique. The proposed algorithm is validated by simulation results. [ABSTRACT FROM AUTHOR]

Published
2013
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