Improving the Target Position Detection in the Crossed Array Detectors Seeker by Categorizing the FOV up to the Pulses Distribution

Abstract

Seeking in a field of view (FOV) is influenced by the existence of jammers, noise, shine background or flying perturbations. All these factors may push the target out of the FOV and cause missing the target. In all the seekers the FOV is not fully exploited which means the target can be missed before becoming out of the FOV, this results of the nonlinearity of the reticle structure. In this paper, a novel method of the target position detection a crossed four slits or crossed array detectors (CAT) seeker will be designed, simulated and evaluated. The idea of this method depends on dividing the FOV into main regions up to a certain parameter, which is the pulses number; then, each main region will be divided into sub-regions up to a second parameter which will be the pulses distribution a spin period. The errors sources will be discussed and evaluated. Other new idea will be applied which is exploiting some area of the FOV where a part of the position data is missed in the information signal by pushing the target to the region where the information signal carries the total position data.

Seeker-Azimuth Determination with Gyro Rotor and Optoelectronic Sensors

“…The seeker is an important part of the navigation system and has been used to accurately search and track a target by determining the target position in the field of view [7]. In the seeker [8,9,10,11,12], the input of the system is the space coordination, and its output is the target position, which is expressed by the deviation signal or the correction signal. This system generally consists of an optical gyroscope part and an electronic detector part, as shown in Figure 1.…”

Design and Simulation a New Unique-Slit Reticle for Pulsed Infrared Seekers

“…One of the design aims is minimizing the functions (Er, Eβ ), but in the lecture evaluation of the linearity is measured by the linearity of the SG function [3,4,6,9]. In all the models the SG function is totally linear over all the reticle area, as shown in Fig.…”

“…For each thermal object the seeker produces four pulses every spinning period. The main problem in this seeker is the small effective area in the FOV, this is because of the non-concentrate or the nutating nature of the seeker which means only 10% of the FOV is effective and the target data can be extracted from the pulses signals [6,9]. In addition to that, in the present of jammers the threat becomes complex because each object has two pulses for the x-deviation and two for the y-deviation.…”

“…The system is a stationary reticle seeker type which employs a fixed reticle, with radius Ra and N=4 transparent 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) [6][7][8]. The distance of the non-concentric TIC center and its phase relatively to the reticle center define the position of the target in the FOV, as shown in Fig.…”

The Flare Detection in the Two Color Crossed Array Detectors Infrared Seeker

“…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][7][8][9][10].…”