Professor Wang Xuesong's research group of National University of Defense Technology has carried out research on the polarization domain zoom angle anti-combination body center of mass jamming countermeasure method, and the results were published in the journal Acta Electronica Sinica.
Introduction to the content
Missile radar is an important sensor for accurate guidance, and a single-pulse mode is usually used in the final guidance stage to achieve accurate tracking of the target. Angular reflector centroid interference is an important passive jamming method to deal with airborne radar tracking. When the ship and the angle anti-space are close and it is difficult to distinguish in distance and angle, a centroid interference situation is formed, and the single-pulse angle measurement result points to the center of mass, causing the seeker to be deflected by the angle.
Counter-centroid interference is essentially to solve the estimation problem of unresolved multi-target, which is usually divided into two steps, one is to determine whether it is a hybrid of "target + interference" after detecting the target, and the other is to accurately measure the target parameters from the aliased echo signal. The traditional statistical method and interference suppression method are only suitable for a single interference, and rely on the correct statistical model and the prior information of interference polarization, and require a large number of pulses to accurately estimate the statistical model parameters, which is limited in practical applications.
The ship target contains a wealth of scattering mechanisms, while the scattering mechanism of the angle anti-group is relatively single, and the polarization information of the two is obviously different, which can be used to improve the detection and suppression of angular anti-interference. However, the existing polarization single-pulse goniometry methods all use multi-channel methods to process polarization information, and the scattering characteristics between targets are not fully utilized, and the efficiency is limited in practical application. In the process of studying radar polarization, the synthetic echoes of adjacent targets under specific polarizations vary greatly. Through the polarization domain zoom processing to control the radar transmission and reception polarization suppression angle antiecho, the accurate measurement of the target angle of the ship can be realized.
In order to solve the above problems, this work analyzes the statistical distribution of characteristic beams and single-pulse angle measurement of polarimetric array radar based on the polarimetric domain zoom super-resolution theory, and expounds the "ship + angle anti" hybrid detection and angle anti-interference suppression principle for angular-inverse combination center-of-mass interference. On this basis, combined with the polarimetric scattering characteristics of the ship, the angular anticenter interference signal model is established, and the interference presence detection and ship angle measurement algorithms are proposed, so as to realize the anti-angle inducement.
Figure 1 Polarization domain zoom processing schematic
Figure 2 Beam spreading factors for single and dual targets
Figure 3 Schematic diagram of the polarization domain zoom single-pulse goniometric probability curve
The simulation results show that the angular measurement accuracy of the proposed method can reach 0.1 times the beamwidth, which can still be effectively measured at -20dB polarization isolation, and the success rate of comprehensive center of mass interference countermeasures can reach more than 80%.
Figure 4 Effect of polarization channel isolation on goniometric performance
About the author
Luo Shengbin Wang (corresponding author), Ph.D. Lecturer, College of Electronic Science, National University of Defense Technology. Mainly engaged in radar system, array signal processing and radar signal processing research.
Wang Xuesong is a professor at the National University of Defense Technology, a national outstanding youth, the first national defense outstanding youth, a national Youbo, a leading talent of the 10,000 people plan and a leading talent of military scientific and technological innovation. Engaged in the research work in the field of radar and electronic countermeasures of the new system, he has won 2 second prizes of national scientific and technological progress, 8 first prizes of military and provincial and ministerial awards, and has won the "Qiushi" award of the China Association for Science and Technology, the "Contemporary Inventor" of the China Invention Association, and enjoys special government allowances.
Dissertation information
Radar polarization domain zoom angle anti-combination countermeasure method: anti-center of mass interference
WANG Luoshengbin, WU Guoqing, XU Zhenhai, LI Yongzhen, WANG Xuesong
Acta Electronica Sinica, pre-publication
DOI: 10.12263/DZXB.20221139