The paper presents the main objective of the idea of a photonic radar and an example of the engineering of the first fixed photonic radar demonstrator, designed for use in air traffic control. Some issues related to the production and transmission of microwave and optical signals, as well as the frequency conversion of these signals have also been presented.
Conducting research on the state of superposition and the phenomenon of tunnelling has resulted in the discovery of quantum entanglement and quantum teleportation. They have laid the foundation for quantum cryptography and the construction of devices for remote sensing surveillance. The article presents selected aspects and references to some phenomena formulating the basis of quantum remote sensing. The potential benefits of quantum entanglement and quantum entangled photon beam illumination in this field have also been mentioned.
This paper provides an overview of the characteristics of selected types of active interference dedicated to medium range surveillance radars. That is why at the very beginning examples of platforms used to interfere the operations of both land based surveillance radars and radars mounted on boards of combat aircraft are characterized. The paper focuses mostly on surveillance radars and their resistance to noise jamming. An example calculation of effective jamming range in relation to a medium range radar is considered in the text. Moreover a graphic representation of the influence of jamming on the operation of a radar with reference to the application of jamming and thereof lack are discussed. The basic aim of the considerations is an efficiency assessment of the jamming impact on the operation of the radar. Among others the effectiveness of the radar transmit pulse power changing is assessed with regard to the prevention of intentional jamming. The conclusions provide exemplary methods of mitigating the impact of jamming on the operation of the radar. Additionally the paper provides information on priorities to be taken into consideration in the field of contemporary radiolocation.
Planar antennae manufactured on typical dielectric substrates have many essential advantages. One of them is mechanical strength that is very important as far as airborne application is concerned. Radar imaging systems using synthetic aperture technology (SAR) do not impose exaggerated requirements for an antenna bandwidth or gain but its mechanical properties as well as phase and frequency characteristics stability are the key features. In the paper the planar Uda-Yagi antenna being able to work close to perpendicular metal plate surface (e.g. fuselage) at center frequency 3 GHz is described. It was designed analytically adapting Uda-Mushiake model for mutual impedances calculation and finite difference time domain (FDTD) simulation system. Alongside analytical and numerical results the practical realization as well as preliminary measurements are shown.
In this paper we present the concept of multiple sensors data acquisition from onboard of an Unmanned Air
Vehicule (UAV). Because of flight instabilities caused by atmosferic movements (winds, thermals etc..) it is necessary to
apply active stabilization in order to obtain reliable readings from observation sensors. The most stabilization-demanding
sensor is Synthetic Aperture Radar (SAR) and in this paper two methods of stabilization are presented: hybrid (electromechanical)
and electronic.
The paper deals with the problem of the multifunction radar resources management. The problem consists of target/tasks ranking and tasks scheduling. The paper is focused on the target ranking, with the data fusion approach. The data from the radar (object's velocity, range, altitude, direction etc.), IFF system (Identification Friend or Foe) and ESM system (Electronic Support Measures - information concerning threat's electro - magnetic activities) is used to decide of the importance assignment for each detected target. The main problem consists of the multiplicity of various types of the input information. The information from the radar is of the probabilistic or ambiguous imperfection type and the IFF information is of evidential type. To take the advantage of these information sources the advanced data fusion system is necessary. The system should deal with the following situations: fusion of the evidential and fuzzy information, fusion of the evidential information and a'priori information. The paper describes the system which fuses the fuzzy and the evidential information without previous change to the same type of information. It is also described the proposal of using of the dynamic fuzzy qualifiers. The paper shows the results of the preliminary system's tests.
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