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Wyświetlanie 1-8 z 8
Tytuł:
Algorithm for Target Tracking Using Passive Radar
Autorzy:
Malanowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226412.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
passive coherent location
passive bistatic radar
target tracking
Opis:
In the paper the problem of target tracking in passive radar is addressed. Passive radar measures bistatic parameters of a target: bistatic range and bistatic velocity. The aim of the tracking algorithm is to convert the bistatic measurements into Cartesian coordinates. In the paper a two-stage tracking algorithm is presented, using bistatic and Cartesian tracking. In addition, a target localization algorithm is applied to initialize Cartesian tracks from bistatic measurements. The tracking algorithm is tested using simulated and real data. The real data were obtained from an FM-based passive radar called PaRaDe, developed at Warsaw University of Technology.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 345-350
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Achieving position accuracy against moving target analyze
Autorzy:
Wąż, M.
Panasiuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/320685.pdf
Data publikacji:
2008
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
manewr taktyczny
śledzenie celu
tactical maneuver
target tracking
Opis:
Each navigator has to be able to achieve position by own ship against all types of targets. Maneuver calculations depend mostly on target position and movement vector measurements accuracy. This article presents how the time and maneuver course changes when changes target movement and position data accuracy changes.
Źródło:
Annual of Navigation; 2008, 13; 131-137
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The collapse of sequential Bayesian estimator in two-target tracking problem
Autorzy:
Stano, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/92973.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
track coalescence
Bayesian operator
target tracking
particle filter
Opis:
Track coalescence is a phenomenon that occurs in multi-target tracking applications where certain types of manoeuvres performed simultaneously by several targets can utterly confuse algorithms that track their positions. In its simplest form, the phenomenon occurs when two similar objects, initially well separated, get close to each other and follow similar manoeuvres for a period of time sufficient to confound the tracking algorithm so that when the objects finally depart from each other the tracking algorithm is prone to provide erroneous estimates. This two-target track coalescence is discussed in this paper with the focus on the compound coalescence, when two identical tracks follow the midpoint of two well separated targets. First, the problem is illustrated on a classic problem of tracking two targets manoeuvring in a clutter, which is modeled as a nonlinear stochastic system. It is shown how, otherwise accurate and precise, estimates obtained by a standard particle filter eventually collapse leading to the coalescence of tracks. The phenomenon is given theoretical explanation by the analysis of Bayesian update operator acting on L2-space of probability densities that reveals that the coalescence is an unavoidable consequence of the probabilistic mixing between distributions describing positions of two targets. Finally, the practical consequences of these theoretical results are discussed together with potential approaches to deal with track coalescence in real applications.
Źródło:
Studia Informatica : systems and information technology; 2018, 1-2(22); 32-45
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Target association in the process of tracking radar and AIS integration
Asocjacja obiektów w procesie integracji radaru śledzącego i AIS
Autorzy:
Kazimierski, W.
Powiązania:
https://bibliotekanauki.pl/articles/360439.pdf
Data publikacji:
2010
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
śledzenie obiektów
integracja radar-AIS
radar śledzący
target tracking
radar–AIS integration
tracking radar
Opis:
The article presents issues connected with association of radar and AIS targets in the process of integration of this two systems. Theoretical analysis of the problem has been carried out. IMO requirements has been depicted and included in three association criteria proposed, which sequentially implemented in the algorithm allow firm association of radar and AIS targets. The general condition for association has been presented and it has been subsequently detailed for each criterion. As the basic test association of the position has been taken and it can be supplemented by association of movement vector and history of association in the furtherer steps. In each case the association gate has been defined. The sizes of gates, which allow to consider chosen criterion as fulfilled has been determined by analysis. The presented association algorithms may be used as the first step of radar–AIS integration to lead to multisensory vector fusion in the consecutive steps
W artykule przedstawiono problematykę związaną z asocjacją obiektów radarowych i AIS w ramach procesu integracji tych dwóch systemów. Przeprowadzono teoretyczną analizę zagadnienia. Opisano wymagania IMO i z ich uwzględnieniem zaproponowano trzy kryteria asocjacji, które zastosowane sekwencyjnie w algorytmie pozwolą na jednoznaczne wskazanie przyporządkowanych obiektów z radaru i AIS. Przedstawiono ogólny warunek asocjacji, który następnie rozwinięto szczegółowo dla poszczególnych kryteriów. Jako test podstawowy przyjęto asocjację pozycji, która w kolejnych krokach może być uzupełniona o asocjację wektora ruchu i historii asocjacji w poprzednich krokach. W każdym przypadku zdefiniowano bramkę asocjacyjną. Na drodze analitycznej wyznaczono wielkości bramek, a więc konkretne wartości, które pozwolą uznać wybrane kryterium za spełnione. Zaprezentowane algorytmy asocjacji mogą stanowić pierwszy etap integracji obiektów śledzonych przez radar i AIS, aby w kolejnych doprowadzić do fuzji wektorów z obu systemów.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 22 (94); 18-22
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single target tracking algorithm for lightweight Siamese networks based on global attention
Autorzy:
Wang, Zhentao
He, Xiaowei
Cheng, Rao
Powiązania:
https://bibliotekanauki.pl/articles/2173664.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
target tracking
Siamese network
semantic information
training strategy
feature fusion
deep learning
śledzenie celu
sieć syjamska
informacja semantyczna
strategia szkolenia
fuzja funkcji
głęboka nauka
Opis:
Object tracking based on Siamese networks has achieved great success in recent years, but increasingly advanced trackers are also becoming cumbersome, which will severely limit deployment on resource-constrained devices. To solve the above problems, we designed a network with the same or higher tracking performance as other lightweight models based on the SiamFC lightweight tracking model. At the same time, for the problems that the SiamFC tracking network is poor in processing similar semantic information, deformation, illumination change, and scale change, we propose a global attention module and different scale training and testing strategies to solve them. To verify the effectiveness of the proposed algorithm, this paper has done comparative experiments on the ILSVRC, OTB100, VOT2018 datasets. The experimental results show that the method proposed in this paper can significantly improve the performance of the benchmark algorithm.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e139961
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multisensor Tracking of Marine Targets : Decentralized Fusion of Kalman and Neural Filters
Autorzy:
Stateczny, A.
Kazimierski, W.
Powiązania:
https://bibliotekanauki.pl/articles/226579.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
target tracking
sensor fusion
Kalman filter
neural filters
Opis:
This paper presents an algorithm of multisensor decentralized data fusion for radar tracking of maritime targets. The fusion is performed in the space of Kalman Filter and is done by finding weighted average of single state estimates provided be each of the sensors. The sensors use numerical or neural filters for tracking. The article presents two tracking methods - Kalman Filter and General Regression Neural Network, together with the fusion algorithm. The structural and measurement models of moving target are determined. Two approaches for data fusion are stated - centralized and decentralized - and the latter is thoroughly examined. Further, the discussion on main fusing process problems in complex radar systems is presented. This includes coordinates transformation, track association and measurements synchronization. The results of numerical experiment simulating tracking and fusion process are highlighted. The article is ended with a summary of the issues pointed out during the research.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 1; 65-70
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Servo tracking of targets at sea
Autorzy:
Ahmed, A.
Brdyś, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/908404.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
śledzenie celu
urządzenie śledzące
filtr Kalmana
adaptacyjny układ sterowania
target tracking
tracker
Kalman filter
adaptive control
Opis:
This paper details a proposal for the position control system of a two-axis ship-mounted tracker. Aspects of the non-linear dynamics governing Line-Of-Sight (LOS) errors between the tracker and the target are presented. It is shown that the regulation of LOS errors can be achieved by introducing a feed-forward term based on the target’s velocity. This velocity is not measurable, and an estimator is required. Given that the tracking problem is non-linear, the classical separation principle does not hold, and cascading the estimator and regulator together may not lead to an optimal position control system. The ‘LQAdaptive’ system proposed here aims therefore to improve conformity to the separation principle. Simulation trials show that tracking is improved under the LQAdaptive system in comparison to a simple estimator-regulator structure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 2; 197-207
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of the accuracy requirements for relative course and closest point of approach
Autorzy:
Juszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/135158.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
radar systems
IMO performance standards
target tracking
safety of navigation
risk assessment
marine simulation
Opis:
Closest point of approach (CPA) is a basic factor taken into consideration for risk assessment during the meeting of two ships at sea. Navigators should use radars with automatic target tracking for collision avoidance and should know the accuracy to which radar data are calculated. Basic information about these requirements can be found in IMO resolutions. The currently binding document for devices manufactured after 2008 is IMO Resolution MSC.192(79). But there are two independent requirements for relative motion. One of these refers to relative motion parameters (relative course and speed) and the other one to the value that is the result of this motion (CPA). The other important document is Standard 62388. This specifies the minimum operational and performance requirements, methods of testing and the required test results published by IEC and also refers to radar equipment. However, this standard is not so popular in different publications focusing on radar equipment, so these requirements were not analyzed in the article. The main problem described in this paper refers to the mutual consistency of IMO Resolution requirements. The results of simulations and their analysis are presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 108-113
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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