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It is continuing to study the new type of chopper radiometer, providing unbiased estimation of power (or its associated features) of radiometric signals at the receiver with instability predetection section. The receiver block diagram is developing. Its analog and digital part are concretized. The basic operations of the signal processing in digital part implements in FPGA, which is digitized after...
We demonstrate the ability of a passive radar system to monitor a large area of interest by applying advanced multipath clutter cancellation algorithm, spatial beamforming and tracking techniques. The mitigation of clutter disturbance and a two stage beamforming method facilitate real time tracking of small to moderate size targets in real Cartesian domain. The results have been validated through...
Aiming at the technology of target detection based on broadcasting satellite passive radar. This paper presents the characteristic of broadcasting satellite signals and its ambiguity function. Calculates the maximum detection distance by analyzing the power loss and the gain of signal processing. Demonstrates the necessity of depressing the direct satellite signals. The conclusion of this paper is:...
Nowadays, Unmanned Aerial Vehicles (UAVs) platform are widely employed in a broad range of applications: from environmental monitoring and precise agriculture to humanitarian localization and rescue and prevention of events such as floods, fires, landslides. On the other hand, Global Navigation Satellite System Reflectometry (GNSS-R) is an emerging technique which allows to monitor Earths surface...
This paper addresses the problem of interference cancellation in passive bistatic radar. The impact of fractional time delay, channel linearity and reference channel signal-to-noise-ratio (SNR) on the interference cancellation performance is analyzed, and the results show that the performance of adaptive cancellation algorithm is degraded by the fractional time delay, the difference between the frequency...
We investigate the performance of a Bucci based beamformer design and MUSIC algorithm under a passive radar setup using experimental measurements. A uniformly spaced linearly array of 11 discone antennas was used for the passive radar. The experiment was performed by exploiting the DVB-T broadcasting station as the illuminator of opportunity. In order to suppress the direct reference signal and clutters,...
The optimal algorithm for 3D imaging of a spatially extended object is synthesized using a multi-antenna space-distributed radiometric system. The block diagram of the system implementing the obtained algorithm is given. Expressions for limiting errors of coordinate estimation of each area of the object are obtained.
The direct signal and clutter heavily degrade the performance of the target detection in passive radar. Therefore a reference antenna is necessary in order to acquire the direct signal, which is used to perform the adaptive filtering in order to cancel the direct signal and the clutter received on the surveillance antenna. However there may be distance between the two antennas, leading to reduced...
A wideband antenna array, conformed to a cylinder, is presented. It covers 360° from 1.2 GHz up to 3.6 GHz. It is made of 10 spiral antennas and backed by a ten face ground plane. Its diameter is 28cm, so almost one lambda at 1.2 GHz. It is designed for passive radar.
Passive Radar systems use the target illumination by third-party transmitters, e.g. FM radio or terrestrial TV broadcast stations, for target detection and localisation. In 2010 Airbus Defence & Space initiated the development of a mobile multiband Passive Radar demonstrator [1–8], processing FM (analogue radio), DAB (Digital Audio Broadcast) and DVB-T (Digital Video Broadcast-Terrestrial) waveforms...
Passive radar receivers use transmitters of opportunity such as digital television (DTV) broadcast to detect targets. The next generation Manastash Ridge Radar (MRR) is designed without the use of an analog downconverter to observe transmitters up to 1.5 GHz. In addition to fast sampling, the receiver is built around a Xilinx Virtex-5 field programmable gate array (FPGA) for software-defined, flexible,...
History and results of the far troposphere UHF wave propagation over terrestrial and marine paths carried out in the USSR during the second part of the XX century are given in the paper. The considerable part of the investigation was done by the group of the Tomsk State University of Control Systems and Radioelectronics. There are compared the results got by different researchers in different countries...
An antenna without phase center system used for DOA estimation and beam steering was introduced in. In the radar problem, the antenna can receive the signals scattered from a moving target. In this paper, an approach for passive radar using a smart antenna system is introduced. We assume that the primary transmitted signal comes from a known fix voice broadcasting station. The principle of the passive...
Passive radars are under investigation due to its interesting potentiality: the use of independent sources is possible for the large diffusion of high power broadcasting stations. VHF stations guarantees high power and wide coverage areas. Consequently to large wavelength in this band, the antenna systems design is fundamental. The study leads to the interferometry configuration of a passive radar,...
The passive radar has been revitalized through the passive coherent location technology. These systems have unique properties, especially is time on target high compared to traditional radar systems, as well as the freedom in choosing from the available transmitters of opportunity. This paper will focus on how to take advantage of the latter of these two special properties in order to achieve better...
The paper presents digital beamforming for Passive Coherent Location (PCL) radar. The considered circular antenna array is a part of a passive system developed at Warsaw University of Technology. The system is based on FM radio transmitters. The array consists of eight half-wave dipoles arranged in a circular array covering 360deg with multiple beams. The digital beamforming procedure is presented,...
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