Anti-decoying Techniques Using Polarization In Passive Radar Seeker

Conventional monopulse passive radar seeker is inadequate for the complex electromagnetic battlefields, which highly weakens the operational effectiveness of the anti-radiation missile. Therefore, to conduct the in-depth research of PRS anti-decoying technique will bring significant benefits both for military and civil use.Based on the attack-defense confrontation of ARM in modern electronic warfare environment, the thesis comprehensively studies and utilizes the polarization information in the active decoying system, and carries out researches on angle measuring and anti-decoying techniques.The spatial polarization characteristics of active decoying systems antennas are deeply analyzed to establish the foundation for applications of antenna’s spatia l polarization characteristics. Aiming at different radar antennas and decoy antenna, the changing law of radar antennas and decoy antenna’s polarization characteristics is obtained through theoretical analysis and electromagnetic calculation. The statistical analysis of antenna’s spatial polarization characteristics in the local range is obtained as well. In accordance with the sample offset paraboloid radar antenna and the one-dimensional phased array, the changing law of antennas’ spatial polarization characteristics is depicted via outfield test. It is confirmed that the spatial polarization characteristics of the practical antennas is coincidence with the theoretical calculated value. In terms of the typical scenario of the attack-defense confrontation of ARM, the dynamic polarization characteristics of the active decoy system antennas is studied, which provides a theoretical base for applications of polarization information.For the application aspect, which is another focus of this thesis, in order to improve the performance of the angle measuring and the anti-decoying, the key techniques of applications of polarization information on angle measuring, resolution and recognition in PRS are studied by using the spatial polarization characteristics of active decoy system antennas. As to the poor performance of conventional single-polarization phase interferometer in actual combats, a two-dimension angle-measuring method based on diverse-polarization UCA interferometer is proposed, and this method meets the requirement of high accuracy for PRS when the signal polarization changes. In addition, a method using polarization phase interferometer is proposed to improve the angle measuring accuracy in coherent sources. Then polarization arrays are utilized in order to improve the angular resolution in PRS. The anti-decoying performance using polarization arrays is analyzed in the typical scenarios, which ascertain the incomparable advantages of polarization arrays in PRS. Based on the differences of polarization characteristic between radar antenna and the decoy antenna, an emitter recognition method using the dynamic polarization characteristics of antennas is presented, which mainly accomplishes the recognition of mechanical scanning radar antennas and the active decoy antenna.In short, compared with other traditional anti-decoying techniques, the research results of this thesis is helpful to improve PRS’s abilities of angle measuring, anti-decoying and emitter recognition by using polarization information. This study provides theoretical foundation and technical supports for improvement of ARM performance in the fierce confrontation situation.