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Time Difference Of Arrival (TDOA) method is very often used inside electronic intelligence systems. TDOA method requires the high signal to noise ratio at the output of the intermediate frequency amplifier for target localization, usually around 12 dB or more. At low signal-to-noise ratio TDOA is inaccurate and especially in case of the active jamming it is nearly impossible. The multilateral TDOA...
The intensive research and development efforts in the area of unmanned aerial vehicles (UAV) detection for security applications is observed in the last decade. The published research results are focused on applications in particular domains (e.g. acoustic, ultrasonic, optical, infrared, radiofrequency…) whereas the probability characteristics for each assumed application evaluation are needed. This...
The operation algorithm of a multilateral time difference of arrival intelligence system, which enables to locate and to pursue the targets at the low signal to noise ratio at the output of intermediate frequency amplifier, is proposed in the paper.
Phase-coded radar signals and pulse compression offer the promise of exact range sidelobe cancellation. Using of these signals enables to decrease transmitted power of radar, to improve range resolution and resistance against various kinds of distortion or active jamming. The principal limitation of phase-coded radar signals is its sensitivity to the Doppler shift in case of moving targets. The techniques...
This paper deals with evaluation and simulation of direct detection radiometer, which operates in the W-frequency band. Radiometers can be used in wide range applications in industry, military and security as well. One of the possible applications where the radiometers can be used is scanning of concealed dangerous objects. Main part of the article deals with the theoretical analysis of the basic...
In this paper performance of Walsh-Hadamard sequences (WHS) for binary encoding of radar signals is described. It is shown that between WHS with length 8, 16 and 32 it is possible to find a set of orthogonal sequences with good properties. Probability of correct range detection of selected WHS in presence of active noise jamming is described and it is compared with cases when Barker code is used for...
A modern pulse radar uses more and more complex waveforms. Some waveforms are developed intentionally to make their interception almost impossible or jamming resistant. The main distinctive features of radar signal are hidden in its intra-pulse structure. The intra-pulse modulation analysis of a detected signal is the major task of ELINT/ESM systems, too. As a result of measurement, for each pulse...
A modern pulse radar uses more and more complex waveforms. Some waveforms are developed intentionally to make their interception almost impossible or jamming resistant. The main distinctive features of radar signal are hidden in its intra-pulse structure. The intra-pulse modulation analysis of a detected signal is the major task of ELINT/ESM systems, too. As a result of measurement, for each pulse...
Modern radar uses more and more complex waveforms. Some waveforms are developed intentionally to make their intercept almost impossible. The main distinctive features of radar signal are hidden in its intrapulse structure. The intrapulse modulation analysis of a detected signal is a major task of an ELINT/ESM system. As a result of measurement, for each pulse specific description, so called pulse...
The antenna is an essential part of many electronic systems. Selecting the best antenna may be very important, but selecting the right antenna can be a difficult task, because of variation in the way manufacturers specify and describe them. This paper introduces a method to measure an antenna gain and antenna factor of small loop antennas. It is well known, that the antenna measurement in an anechoic...
The intra-pulse modulation analysis of a detected signal is a major task of an intelligent receiver, in various civilian and military applications. To determine a signal source signature (e.g. radar or jammer) with M-ary Frequency Shift Keying intra-pulse modulation (M-FSK intra-pulse modulation) in the recent hardware implementation of electronic intelligence system receivers is difficult to achieve...
There are several important antenna characteristics that should be considered when choosing an antenna for your application. The directivity and radiation pattern are very important characteristics. Measurement site includes not only electrical, but the mechanical equipment too. One of most important problems is the synchronization of data acquisition with antenna rotation system. The paper describes...
The antenna is an essential part of a test system. In some applications, selecting the best antenna may be very important. Unfortunately, selecting the right antenna can be a difficult task, because of variation in the way manufacturers specify and describe them. This article explains the specific method of the antenna factor (AF) as one of the main antenna parameters definition by measurement in...
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