In this paper a general analytical formula for the error induced in an angle tracking system by a phase front distorted jamming is derived. The electric fields originating from two coherent jamming sources are analyzed. The amplitude and phase of their resultant are computed; from which the parameters affecting that field are studied and the phase front equation is derived and plotted for different values of those parameters. Further analysis of the phase front equation leads to studying its inclination to the ideal spherical phase front, which leads to a general formula for the induced angular error. A similar approach was adopted in ref. [5] but the derivation was done in a special case. It is interesting that the resulting angular error depends only on the jamming system parameters and does not depend on the tracking system parameters or even on its type.
In this paper a proposed mathematical model is formulated and analyzed for the automatic gain control subsystem of a hostile radar homing missile receiver. The model is intended for evaluating an angular deception jamming technique called "AGC DECEPTION". The analysis of this technique needs a real-time laboratory model that responds to external excitations in exactly the same way as the original AGC subsystem does. The author has designed, realized and tested an analogue circuit model; upon which the proposed jamming technique can be applied and optimized for maximum effectiveness. This paper is interested only in the modelling process and the extent to which the author's model; drawn in Fig. 9, resembles the original missile AGC subsystem. With the proposed simulation technique every RF or video signal parameter is represented as a DC variable voltage that can be easily measured in real time on an oscilloscope.
In this paper we introduce a complete modelling and simulation of both target and missile trajectories in one plane with and without the effect of phase front distortion jamming. Although the missile guidance is done in two independent perpendicular planes, the simulation process in the other plane will be identical to that included in this model. Besides, the time variation of different variables in the missile radar guidance system are computed and displayed, to monitor the system performance along the missile trajectory starting from the missile launch up to the impact point. The impact is defined here as the time instant when the rate of variation of the relative speed measured by the missile radio fuse crosses the zero value. This is the same definition adopted by the radio fuse system. The missile-target range at this instant is calculated and displayed as the final miss-distance. Without such a simulation, it is not possible to evaluate an angular deception technique and optimize its parameters; since the instantaneous effect of angle deception will be recovered by the proportional navigation guidance system and the only criterion of jamming effectiveness is the final miss-distance [1]. The simulation program is written as an m-file to be run in MATLAB environment.
In this paper the first digital radio frequency memory designed and implemented in Egypt is described. It took two years of dedicated work from the research group to understand the new concepts and techniques, solve many technical problems and perform many design trials until this DRFM system has been built. The design and performance of this DRFM are described in detail and test results are given at the end of the paper.
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