Modeling and Simulation of the Active Jammer Effect in the Crossed Array Detectors Infrared Seeker
IR active jammers or the directed infrared counter measures(DIRCM)generate IR signals which attack the guidance signals passed to the sensors in IR-guided weapons. They provide IR signals with appropriate frequency, phase and intensity which will be superposed on those produced by the IR energy of the target passing through the reticle. When both the jamming signal and the modulated target energy signals are received by the missile‟s IR sensor, they cause the tracker to produce incorrect guidance commands and push the target out of the field of view (FOV). In this paper, the seeker signals of a crossed four slits or crossed array detectors (CAT) infrared seeker will be simulated. Then the active jammer signal is modeled and simulated. After that, the effect of all the active jammer parameters will be discussed and simulated. Finally, the conditions or the ranges of these parameters in which the active jammer can affect the seeking process will be stated.
The Flare Detection in the Two Color Crossed Array Detectors Infrared Seeker
In this paper, it is stated several methods for detecting the flares in the FOV of a crossed array detectors seeker (CAT) or a four crossed slits reticle seeker. Firstly, detecting using the amplitude of one of the two channels in the two color seeker will be stated. Secondly, detecting the flares using the ratio factor between the two channels in several ways will be discussed. All the modeling and simulation tasks and processes will be designed and developed using the MATLAB® tools and packages. The structure of the crossed ship reticle or the crossed four slits reticle (Actually it is equivalent to a reticle with four crossed array detectors CAT), which is a stationary reticle type, will be stated with the design parameters. This type employs a fixed reticle, with radius Ra and N=4 transparent sectors or slits, and a slightly tilted rotating mirror or lens (with spinning frequency fm ) to sweep the Target Image Spot (TIS) along a circular path on the reticle Target Imaging Circle (TIC) with constant radius (RN), as shown in Fig. 1,2. The distance of the non-concentric TIC centre and its phase relatively to the reticle centre define the position of the target in the FOV [6-10].
Analysis Of Rising-Sun Reticle
This paper is concerned with the properties of the rising-sun frequency-modulation reticle as it affects the generation of error-signal problems. The exact relations between the errors and the target position are given.