The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper is devoted to demonstrate a Genetic Algorithm optimization of a dynamic navigation ratio for launch vehicles target scenario. This optimization provides a bounded target interception under six degrees of freedom control and minimum-effort-miss distance to improve the intercepting accuracy of launch vehicles. This optimization is performed for two guidance laws, the proportional navigation...
This paper introduce a new Automatic radar tracking system with multiple observations from Multistatic radar using a Particle filter as a nonlinear predictor for data fusion and prediction. The algorithm is based on using Particle filter instead of using a linear or non-linear Kalman Filter (Extended Kalman Filter). Particle filtering, also known as Sequential Monte Carlo, is an attractive estimation...
Radar systems, based on Multistatic radar concept attracted a substantial attention in the recent years. The paper proposes system geometry for S-band Multistatic radar. This technique is used for detecting and tracking the small cross section area and stealthy aircrafts. The proposed geometrical structures are studied with different radars spacing to extend the detection coverage over the Monostatic...
A novel concept for determining Direction of Arrival estimation (DOAE) of air target has been investigated. The methodology relies on the echo signal inducing a known spatially varying electric field. In Uniform Linear Array (ULA), the elevation angle is estimated by multiresolution ESPRIT (MRESPRIT) method. The efficacy of the proposed algorithm is verified by Monte Carlo simulation, DOAE accuracy...
Security, authentication, and identification are essential requirement for confidential data transmission. The will known methods of data encryption attain certain security levels, they make the encrypted data unreadable and unnatural this attracts some unintended observer attention. To search for a higher security approach, Steganography and Cryptography are two popular ways of sending vital information...
This paper is devoted to model a multistatic radar crossection MRCS for F117 stealthy target. The model predict the target aperture area using a scaled model measurements in order to achieve a long scale electromagnetic RCS for the modeled aircraft. The target MRCS is modeled as a function of the electromagnetic wave incident angle, its polarization, target azimuth angle, elevation angle, and the...
This paper present a multi-channel, high resolution, fast lock phase locked loop (PLL) for surveillance radar applications. Phase detector based PLLs are simple to design, suffer no systematic phase error, and can run at the highest speed. Reducing loop gain can proportionally improve jitter performance, but also reduces locking time and pull-in range. The proposed system is based on digital process...
Security problem is an essential requirement for data transmission. Although the will known methods of data encryption attain certain security levels, they make the encrypted data unreadable, and unnatural, this attracts some unintended observer attention. So it is required to search for a higher security approach. The present paper introduces a new hybrid steganography algorithm to achieve a higher...
Stealthy aircraft detection attracted a substantial attention in the recent years. The paper proposes an alternative measures for detecting stealthy aircraft using the operating monostatic radar parameters. This technique is used for detecting and tracking the small cross section area and stealthy aircrafts. The proposed measures are studied with different radar parameters to extend the detection...
In this paper, new optimized multilevel biphase pulse compression codes (MBPCC) with low peak side lobe (PSL) and mean side lobes (MSL) have been investigated. Amplitude and phase coding have been used during the optimization process. In previous studies, biphase codes were optimized using genetic algorithm (GA). The robustness of genetic algorithm in solving optimization problems degrades simultaneously...
The paper is devoted to propose a new chaos steganography algorithm for hiding the multimedia data, image, text, or sound. The proposed algorithm based on coordinate the data in the image dimensions using chaos distribution arrangement. The data is embedded with the original image in the pixels least significant bits, so can't appears within the image. When the image received the embedded data is...
The application of the genetic algorithms to the optimization of planar array weights will be investigated with −30 dB attenuators weight precision. The aim is to adjust the weight coefficients of the array attenuators in −30 dB precision to achieve a minimum sidelobe level (SLL) with narrower beam width. The peak sidelobe level (PSL) of the synthesized beam pattern has been successfully lowered....
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.