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In this paper the need for research on Microwave Direct Energy Weapons (ADSs) is argued. Devices developed both in the United States and the Russian Federation are presented.
The paper presents an architectural overview of a scalable digital platform for current and prospective radar systems. The platform was developed specifically to cope with multichannel digital pulse compression and digital beamforming. It consists of two main subsystems. The above rotary joint subsystem performs mutichannel sampling, IQ downconversion, signal conditioning and pulse compression. The...
Recommendations about possible variants of navigation means exploitation systems modernization were considered and questions of quality providing of radio navigation systems functioning during the exploitation were analyzed The usage of specific control algorithms during the exploitation of different radio engineering systems was proposed. Calculation results of such algorithms efficiency were obtained.
We present in the paper results of a generalised micro-Doppler analysis that is suited to high range resolution radar. The target echo energy is here represented in the three dimensional space of time, Doppler, and additionally range, what can provide more information on target micro-motion than the standard micro-Doppler analysis which is performed in the time-Doppler plane. The analyzed signals...
This paper describes airborne targets detection possibilities using weather radar signals. During last two decades air traffics increased significantly. The airborne target like airplane or helicopter is a fast moving object on the radar horizon which gives strong Doppler echoes in received signal. In this paper we would like to show the results of simple processing echo from weather radar on Legionowo...
This paper presents the results of polarimetric micro-Doppler analyses using X-band Frequency Modulated Continuous Wave (FMCW) Radar. In July 2014 the measurement campaign was jointly carried out by Metasensing BV and Warsaw University of Technology. It took place nearby Metasensing premises in Noordwijk, Holland. The radar sensor used in the experiments has a two-channel receiver. Radar data was...
In this paper the ability to measure a radiation pattern of omnidirectional antennas without using an anechoic chamber is presented. For this purpose, the time domain technique is used and the influence of this solution on an antenna radiation pattern is shown. Moreover difference between radiation patterns obtained from an anechoic chamber and office room using postprocessing in time domain are presented.
In this study, we present an iterative method for finding target position using only range measurements from multi-static passive radar system. We formulate an optimization problem and use the gradient descent approach to locate target position. In addition, we show that for multi-receiver-single-transmitter system, our method requires only three receivers in order to converge to the correct position...
The paper presents the concept of selective transmission of the ECG signal between the recorder located on the body of the monitored person and the mobile device. This concept is based on the possibility of energy saving by transmitting only necessary parts of signal. For the ECG, the most important data consist of waves P-QRS-T waves, located only in a neighborhood of the central point on timeline...
MIMO approach to implementation of radar tomography is described and preliminary results of its experimental validation using Ka-band noise waveform ground based SAR are presented. MIMO concept with time-division to of Tx/Rx channels is applied to emulate 2D aperture synthesis combined with range resolution due to wideband random signals. Two linear synthetic apertures have been used for transmit...
In this paper a real-time SAR imagery displaying application is presented. The application was developed as part of the SARape (Synthetic Aperture Radar for all weather penetrating UAV application) project sponsored by the European Defence Agency. The application receives processed data via an SAR processing application, performs image formation and displays the results in real time. The main engine...
Activity recognition is an important subject with many applications in health care, emergency care, and assisted living. Nowadays, activity information can be acquired using small accelerometers connected to the body, including the ones available in smartphones. In this study, we assessed the influence of autoregressive model parameters or features on activity detection or classification. Our results...
The number plate detection is a key step affecting the overall performance of the number plate recognition system. In the paper a novel algorithm for this purpose is proposed. The approach is based on the detection of text areas using the stroke width transform. More plate candidates are detected using the specifically developed image preprocessing scheme based on set of morphological operators and...
In Continuous Wave (CW) Radars, especially ones transmitting noise signals, the masking effect may cause weak echoes to be completely masked in the sidelobes of strong echo targets. In radars where the transmit and receive antennas are close to each other, the strongest signals are direct crosstalk and close reflections. In this paper a novel mismatched filter is considered for suppressing the range...
Fuzzy Inference System (FIS) is developed using subtractive clustering algorithm, and applied to classification between MRI images of patients having Mild Cognitive Impairment (MCI) or Alzheimer's Disease (AD) and Normal Controls (NC). Features used as FIS inputs are mean values and standard deviations in intensities from most descriptive brain regions. k-fold cross-validation was used to estimate...
Non-linear filter with studentized coefficients of time-frequency decomposition and signal reconstruction is described. The main feature of time-frequency decomposition is least squares estimation of spline fragments of different scales. Filter performs selection of statistically significant components of time-frequency decomposition taking into account local variance of residuals. The main advantage...
An article is dedicated to creation of locally-optimal robust algorithm of non-Gaussian signal detection on the base of sampling statistical analysis and to investigation of the algorithm effectiveness.
A voltage tunable bandpass filter is presented. The filter is realized in microstrip technology using two stepped-impedance resonators. The voltage tuning is provided by means of varactor diodes. The filter has fixed absolute bandwidth of 30 MHz in the frequency range from 375 MHz to 915 MHz. The insertion loss is lower than 5 dB and return loss better than 17 dB in the full tuning range. The out...
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