نوع مقاله : مخابرات - سیستم
نویسندگان
1 دانشگاه صنعتی مالک اشتر
2 گروه مخابرات، مجتمع برق و کامپیوتر، دانشگاه صنعتی مالک اشتر، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
One of the important and new applications is determining the position of aerial targets such as hostile long-range UAV’s. Considering the connection of the terminal of these UAVs with satellites of the ground in order to carry out the assigned mission, the positioning scenario has been planned accordingly. In this article, the aim is to passively locate these UAVs using the Geolocation method based on extracting the cross ambiguity function by considering the TDOA/FDOA parameters. For this basis, positioning has been done with a scenario based on two GEO satellites (called primary and secondary satellites) and the installation of three ground receivers in designated locations and the modeling of the received signals using the properties of time delays and Doppler shift. For this purpose, by entering the time and frequency parameters in the modeled signals, the cross ambiguity function of the satellite signals received by the ground receivers has been solved. The purpose of this article is to find suitable methods for passive localization of moving aerial targets. For this, by using the method of cross ambiguity function, the target position calculation based on TDOA and FDOA is introduced and investigated. These methods are proportional to the information obtained from the measurements made on the received signals, and appropriate criteria are also provided for comparing these methods. In the proposed method, modeling is based on two ground receivers and one reference receiver. This approach has significant advantages compared to other localization methods that typically use more than three receivers and two satellites simultaneously. And, its improvement in different SNR. By performing the simulation, the peak value of the ambiguity function, which indicates the intersection of the TDOA, FDOA and target location equations, was calculated. The results of the performed simulations show the improvement of positioning accuracy and reaching the Cramer-Rao band.
کلیدواژهها [English]
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