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A method for mitigating antenna motion effects in high frequency radar Doppler spectra developed from ocean backscatter is proposed. Based on the established radar cross section models for a fixed antenna and for an antenna on a floating platform, the relationship between these models is developed. Through this relationship, motion compensation can be achieved by deconvolving the radar cross section...
This paper deals with a method of detecting strong rain areas as well as regions with light rain when using airborne radar. Especially thunderstorm cells in a light rain environment are intended to be recognized. Although this type of radar is no highly sophisticated weather radar, it would be possible for such radar, slightly modified, to operate in a weather mode for detecting and classifying rain...
The airborne monitoring of scenes using unmanned or small piloted aircrafts is becoming increasingly important. Several types of airborne sensors - in the electro-optical, infrared or millimeter wave spectrum - are available for the different platforms. Beside the all-weather suitability of the sensors, the deployment scenarios, often demand for the ability to look through dust clouds, smoke, or fog...
Fully automated vehicles are currently under research and development and will become reality in the near future. Key enabling sensors in this area are automotive radars, which currently support driving comfort and crash prevention. These radars operate in the 24 GHz and 76–81 GHz bands as of today and occupy the spectrum heavily. Hence automotive radar sensors require immunity to interference of...
Pilots in manned aviation shall “See and Avoid” other aircraft in front of and beside the own aircraft. “Sense and Avoid” (S&A) systems shall enable the operation of unmanned aerial vehicles (UAVs) in controlled airspace by fulfilling this “See and Avoid” task. One main sensor of such a sense and avoid system is the radar. The crux in developing an S&A radar is to minimize size and weight...
The RAWIS support radar is part of the RAWIS project idea. Essential part of the project is the MIMO-Radar system for observation and monitoring of a disaster area, in special the movement of fragments and debris (Will be presented also on IRS2017). During observation of complex, rugged disaster areas certain parts of the location may not be monitored sufficiently by the MIMO-Radar system. However,...
This article describes CUDA computing architecture, as an effective tool for digital beamforming in radar systems. The goal of this article was to present results of implementations that represents different approaches to this issue. In this article authors also presented different methods of increasing the efficiency of the implemented algorithms.
In this work, a viable passive components and transmission media technology is presented for THz-Monolithic Integrated Circuits (THz-MIC). The developed technology is based on shielded microstrip (S-MS) employing a standard monolithic microwave integrated circuit compatible process. The S-MS transmission media uses a 5-µm layer of benzocyclobutene (BCB) on shielded metalized ground plates avoiding...
The Radar Cross Section (RCS) is used to characterize the reflectivity of a target, which is essential for the detection performances of an automotive sensor system. Results of RCS measurements of a child mannequin at 300 GHz are presented for the first time and compared with measurements at the current automotive frequency standards (24 GHz). The RCS range and angular profile measurements of the...
We have recently presented a processor for traffic monitoring applications that combines the post-Doppler space-time adaptive processing (PD STAP) with a road map obtained from the freely available OpenStreetMap (OSM). In this paper, the positioning error model of this processor is presented and discussed. In fact, two error models are combined: one for the PD STAP detections and one for the OSM road...
In the scope of this paper a dual-reflector antenna called Axially Displaced Ellipse (ADE) antenna for being used in X-Band, K-Band radar and any other broadband applications were focused. The antenna design consists of feed antenna and dual-reflector configuration. Broadband Double Ridged Horn (DRH) antenna is designed and used as a feeder. Most used radar frequencies at X-Band and K-Band which are...
This article discusses the possibilities of the location of aircraft via active and passive radiolocation systems. The next part is dedicated to location recording of the aircraft, which uses the general type of Radiolocation Warning Receiver by triangulation method and PG method. Then we examine the analysis of the measured data with the purpose of determination of the location of source radiotechnical...
In this paper, we describe an original multi-functional UWB software-defined radar system's application to dead-reckoning navigation in indoor scenarios. The radar is the only sensor available and no other navigational aids are present, except simple targets of opportunity (TOP), which are then used as references. This work provides the experimental primer on using software-defined sensors for navigational...
Appearance of tragedies like the lost flight MH370 should be eliminated or reduced and in this paper a technique based on the Doppler shift of radio sources of opportunity is suggested as an alternative technique of tracking aircraft. Such systems are based on simultaneous analysis of the Doppler shift caused by aircraft moving with respect to multiple radio signal sources and network of receivers...
In this paper the capability of differentiating surfaces with different roughness characteristics by using bandwidths practical with low TeraHertz (low-THz) devices is discussed. The results presented show that the measured variance from a surface with random surface scatterers decreases as the bandwidth of a transmitted signal increases which allows additional classification of directly illuminated...
The complex multitask Bayesian compressive sensing (CMT-BCS) is well adaptive for sparse complex signal in low signal-to-noise ratio (SNR). However, the dimensions of measurement vector and dictionary matrix are double its original one with more iteration time. In this paper, we extend the Bayesian compressive sensing (BCS) reconstruction method to real and imaginary components with the phase estimation...
The improved approaches for a single source direction-of-arrival estimation in a far-field and near-field cases are proposed. In the far-field case the multichannel maximum likelihood frequency estimation along the uniform linear array is used for direct calculation of the single real spatial frequency. In the near-field case the same method is applied for short sub-arrays for retrieving a set of...
A common function of Electronic Support Measures (ESM) system is a threat detection in the electromagnetic environment and the area surveillance so as to determine the identity of surrounding emitters. The paper presents the application of neural networks as a new way to cluster and classify radar signals in the reconnaissance systems. The basic concepts of this technique are described. The efficiency...
Portable radar was designed for through wall detection of live being and tracking. A combined sampling oscilloscope was used as a receiver and a short pulse generator as a transmitter.
The development of automotive remote surface identification system is an important step in ensuring road safety. In this paper we shall discuss a novel approach which addresses the road surface classification process. This method is based on polarimetric radar and sonar data fusion and surface identification using artificial neural network. A modular artificial neural network, which is considered...
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