نتایج جستجو برای: doppler and bearing tracking
تعداد نتایج: 16867120 فیلتر نتایج به سال:
Towed low frequency active sonar systems (LFAS) are used in Anti-Submarine Warfare (ASW) to detect submarines. LFAS systems are hampered by reverberation in shallow water environments because the interaction of sound with the sea bottom can lead to a large number of point-like sonar contacts resulting in a high false alarm rate. Reducing the false alarm rate under a non-decreasing probability o...
We introduce a novel probabilistic tracking algorithm that incorporates combinatorial data association constraints and model-based track management using variational Bayes. We use a Bethe entropy approximation to incorporate data association constraints that are often ignored in previous probabilistic tracking algorithms. Noteworthy aspects of our method include a model-based mechanism to repla...
Multiple unattended ground sensors are deployed for surveillance, monitoring the movement of troops, military vehicles, and targeting. Usually, the probability of detection ( D P ) of an UGS is low and the false alarm density (FAD) is high. The particle filter (PF) and range-parametrized extended Kalman filter (RPEKF) have been used previously to produce improved results for the single sensor s...
BACKGROUND We hypothesized that abnormalities in regional systolic strain (epsilon) might be present among hypertensive subjects with normal ejection fraction, and, if present, could be used to identify patients at high risk for heart failure. The aim of the current case-control study was to use speckle tracking imaging to identify subclinical global and regional systolic function abnormalities...
Current studies rarely mention radar detection of hybrid vertical take-off and landing (VTOL) fixed-wing drones. We investigated signals an industry-tier VTOL drone, TX25A, compared with the results a quad-rotor DJI Phantom 4. used X-band pulse-Doppler phased array to collect tracking data two drones in coastal area near Yellow Sea China. The measurements indicate that TX25A had double values c...
Echocardiographic imaging is ideally suited for the evaluation of cardiac mechanics because of its intrinsically dynamic nature. Because for decades, echocardiography has been the only imaging modality that allows dynamic imaging of the heart, it is only natural that new, increasingly automated techniques for sophisticated analysis of cardiac mechanics have been driven by researchers and manufa...
This paper considers the problem of tracking a uniform moving source using noisy bearing measurements obtained from distant observer. Observer trajectory optimization plays central role in this problem, with objective to minimize estimation error target state. The Bearing Only Tracking (BOT) passive targets is mainly focused on observer maneuver known trajectories and rarely future prediction s...
The posterior Cramér-Rao bound on the mean square error in tracking the bearing, bearing rate, and power level of a narrowband source is developed. The formulation uses a linear process model with additive noise and a general nonlinear measurement model, where the measurements are the sensor array data. The joint Bayesian Cramér-Rao bound on the state variables over the entire observation inter...
Extended Kalman Filter (EKF) and Unscented Kalman Filter (UKF) are often used in target tracking, but the required Posterior Density Function (PDF) is still approximated by a Gaussian, which may be a gross distortion of the true underlying structure and lead to filter divergence when performing EKF or UKF. Because the uncertainty of process model in bearing only tracking is small compared with ...
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