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Automotive radar sensors typically apply waveforms with a fixed bandwidth. With the new 79 GHz automotive radar band a huge bandwidth of up to 4 GHz has become available, which is an ideal basis for the application of agile waveforms. This paper discusses an approach towards a frequency and bandwidth agile automotive radar sensor that allows to trade maximum range versus resolution. Measurement results...
The paper presents chosen results of testing of non-linear filtering algorithms (an Extended Kalman Filter, two versions of Unscented Kalman Filters and a Particle Filter) in tracking applications. The accuracy of filters have been assessed and compared. The movement of tracked objects has been modeled in a Cartesian frame of reference, whereas the measurements are assumed to be realized in a polar...
This paper focuses on the estimation of target's motion parameters in a moving transmitter/moving receiver forward scatter radar scenario. An extension of the quasicoherent processing initially developed for stationary FSR mode of operation is introduced. This offers an estimation of the target's trajectory in a general case where transmitter and receiver can be moving. Simulated and real data are...
Purpose of the paper is to present a solution for the target height estimation problem for multi-frequency multi-static passive radar. Aim of the proposed estimation strategy is to provide 2D passive sensors, which measure only bistatic range and Doppler, with target height estimation capability via the simultaneous exploitation of multiple FM transmitters (88–108 MHz). Results achieved with simulated...
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...
The goal of most modern automotive safety driver assistance functions is to avoid possible collisions. Pedestrian protection, predictive emergency braking or turn and crossing assist functions are usually based on two steps. First, the radar provides detailed information on the environment, and then a detection procedure is driven. Because of the complicated environment near the vehicle, this second...
Passive radar detection systems based on Global Navigation Satellite System (GNSS) signals have the advantages of wide coverage, long detecting distance and good concealment. If effectively combined with the forward scatter radar (FSR) principle, it can be used to monitor an important area, which is of great significance to national defense security. This paper mainly focused on the analysis of signal...
In an automotive environment the presence of reflecting surfaces cannot be avoided. The electromagnetic wave returning from a target vehicle can get reflected on those surfaces causing a non existing so-called ghost target. For driver assistance systems ghost targets can lead to false decisions and, therefore, they should be detected and avoided. In this paper a model for describing those ghost targets...
Orthogonal Frequency Division Multiplexing (OFDM) based waveform has been widely used as illuminator of opportunity in passive radar systems. Ambiguity function (AF) of OFDM is shown to be nearly perfect thumbtack shaped except for the undesirable high side lobes in the Doppler dimension. In this paper, we propose a novel filtered OFDM scheme to improve OFDM AF by utilizing Filtered Bank Multi-Carrier...
Frequency-Modulated Continuous-Wave Synthetic Aperture Radar (FMCW SAR) is a promising compact remote imaging sensor. A refocusing method of ground moving targets for FMCW SAR is derived considering the moving target range cell walk within a long coherent processing interval. To discriminate the target optimally, the concept of relative motion is utilized. By searching a relative factor, moving targets...
Multiple-input multiple-output (MIMO) radars with wideband signals are useful to discriminate target in clutter. With wideband MIMO radar, the problem of extended target detection in compound-Gaussian clutter is considered in this paper. By obtaining target echoes from each antenna, the detector based on generalized likelihood ratio test (GLRT) is developed. It shows that the shape parameter of clutter,...
Unmanned Aerial Systems (UAS), commonly referred to as drones, are rapidly proliferating bringing about new challenges for security and safety. The reason being their small size and ability to fly low in a highly irregular manner makes them particularly difficult to detect with conventional wide-area surveillance sensors such as a scanning radar. Here, we use staring radar that employs a 2-D antenna...
The focus of this paper is on the estimation of the velocity of moving targets with a Forward Scatter Radar system. To this aim a two-dimensional filter bank is proposed with the generic filter impulse response depending on the target electrical size and on the target trajectory that are a priori unknown. In order to limit the computational load required by the bank for practical applications, a two-step...
GMTI radars operate in high altitudes on airborne platforms and observe wide areas on the ground. Thus thousands of moving objects are detected by their Doppler and all measurements are encoded and transmitted to ground stations. Usually, this ends up in a big data or at least mass data problem, especially when results are collected over a long period of time for analysis. So exploratory data analysis...
The paper puts forward a moving target detection technique for passive bistatic radar systems based on GNSS signals for maritime surveillance applications. If from one hand navigation satellites are extremely attractive as opportunistic sources for passive radar due to their global coverage and the availability of multiple satellites, on the other hand they provide a restricted power budget. To strengthen...
This paper focuses on the feasibility of using Global Navigation Satellite System (GNSS) as the transmitters of opportunity in a passive maritime surveillance radar, mainly for the applications of maritime Moving Target Indication (MTI), as well as the target localization. This can be achieved using multistatic GNSS acquisitions with multiple satellites and a single receiver, and applying multilateration...
The detection performance of a passive radar systems is generally determined by the received reference and surveillance signals purity. In recent times a number of interference cancellation techniques have been researched to deal with the disturbances on the surveillance channel. The variety of different methods operate in the space, time and frequency domains with having different implementations...
The effectiveness analysis of the mismatched sidelobe-free filter for compression of phase-shift keyed signals is performed. At that the various types of phase-shift keying codes were considered. The comparative analysis of compression effectiveness of phase-shift keyed signals is carried out. For codes of different lengths, the pairs with the mismatched sidelobe-free filter were found, providing...
With the increasing complexity of the surrounding maritime situation, the high resolution imaging of ship targets has become a hot topic again in recent years. The optimal time selection based imaging is an effective approach for ship ISAR imaging. In this paper, two optimal time selection based imaging methods for ship targets, which use an improved Doppler Spread (DS) estimation and the Doppler...
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