Passive Radar Guidance Technique And Efficacy Evaluation Under Confrontation Condition

Passive radar seeker (PRS) plays as a key part of anti-radiation weapon, and its capability makes a great impact on whole weapon performance. Conventional guidance techniques in PRS couldn't acclimatize missile itself to the fierce confrontation situation in modern warfare. Accordingly, the thorough research on guidance techniques in PRS under confrontation condition is significant to help one enhance the adaptability of PRS to new surroundings in modern battlefield. It plays as a exigent requirement and a state-of-the-art issue in our military affairs. This thesis is devoted to a thorough research on passive radar guidance technique and its efficacy evaluation method, considering the fierce confrontation of anti-radiation weapon in modern battlefield.Missile-to-target information acquisition in homing phase constitutes a key problem in PRS guidance technique. Some advanced signal processing approaches can effectively enhance the capability of missile-to-target information acquisition in PRS, thus to improve its angular and frequency resolution, which can help PRS itself to counteract the active decoy jamming. In order to do this, confrontation between PRS and its corresponding active decoy interference is setted up as the main line for development in Chapter 2, and the problem of missile-to-target information acquisition in passive radar homing is lucubrated in this chapter. The the existing methods of angle-measuring in monopulse radar are examined, to obtain two kinds of its angle measuring model, which are compound ratio and vector processing model, respectively. The principles and key techniques in active decoy system are discussed for the influence of active decoy jamming on angle-measuring in monopulse radar seeker. A novel angle measuring approach is proposed by combination of monopulse angle-measuring and spatio-temporal spectral analysis, to overcome the shortcoming of low angular resolution in conventional PRS. The performance of this novel method is also analyzed. Some valuable PRS data processing methods are introduced hereon, including abnormal measurements elimination approach using grey theory, and target location estimation approach using Least-square (LS) method by measurement conversion. Both theoretically analysis and simulation reflect that those proposed missile-to-target information acquisition and data processing methods can effectively enhance angular resolution as well as data processing capability of PRS under confrontation condition, which make possible the PRS conturmeausre to decoy jamming.Composited guidance is one of the most important facets for PRS guidance techniques development. A typical composited guidance on the foundation of information fusion of PRS and inertial navigation system (INS) can still work in the case of lost target radiation for homing guidance of anti-radiation weapon attacking. Therefor, composited guidance using PRS/INS data fusion for updating lost target measurements is setted up as the main line for development in Chapter 3, and some key problems of their information fusion are lucubrated in this chapter. A novel relavitve motion model using missile-to-target state vector is established for the introduction of extended Kalman fitering aided by precision inertial navigation system information, i.e. IVIA-EKF. This novel filtering method could effectively overcome the shortcoming of the exsiting missile-to-target motion modeling, as it achieves one's purpose of fusion of seeker meausring information and onboard INS navigation solution. Two-dimensional model, approximated three-dimensional model and precise three-dimensional model are put forward for the application of indirect aiming striking, direct aiming striking and warhead striking in anti-radiation missile (ARM), respectively. The application of IVIA-EKF to anti-radiation weapon is traversed by using substantive simulation experiments for performance evaluation of this novel method. Supported by Armament Investigation in Advance Item, a test platform using INS apparatus is established. IVIA-EKF approach is validated by using this system. Some representative scenarios are designed and carried out on this test platform, in order to perform evaluation of PRS/INS data fusion for updating lost target measurements. Theoretically analysis and simulation show that this proposed IVIA-EKF approach could make full advantage of onboard INS information for seeker measuring error suppressing application, by the effective fusion with seeker measurements and INS navigation. The estimated performance of missile-to-target state by taking this novel method could not only surpass the low-pass filtering, but also those EKF methods using the conventional missile-to-target relative motion model.Experimentation and performance evaluation are two key phases for PRS battle effectiveness support. During the field experiment, one can not only analyze and evaluate PRS performance in accomplishing its military task, but also find out and then resolve some limitations and hidden troubles in PRS. So, experimentation and evaluation of PRS in missile range is setted up as the main line for development in Chapter 4, and the problem of efficacy evaluation of anti-radation weapon under confrontation situation is discussed in this chapter. A novel method for experimental data processing using Grey theory is proposed upon the the actual state of range tests, in which experimental data samples are inadequate and their statistical distribution couldn't be determined. This processing method offers a new choice for experimental data processing in PRS range experimentation. By concluding the features of experimentation and evaluation of electrical equipment in training range, this chapter proposes a new method for PRS efficacy evaluation using nonlinear index aggregation, which could offer the evaluation system framework for PRS range experimentation evaluation.This thesis is devoted to a thorough research on some key techniques in PRS guidance during the confrontation situation of anti-radiation weapon, which include missile-to-target information acquisition in passive radar homing, information fusion of PRS and inertial navigation system, and PRS efficacy evaluation, etc. This research has not only the significance in theory, but also the value of application. The approaches proposed in this paper have been validated in several projects by using field tests, microwave dark room tests and semi-physical simulation experiments. Research of this thesis could enrich and perfect the theory of passive radar guidance and its efficacy evaluation, which can use for reference in enhancing the performance of anti-radiation weapon in confrontation situation.