In this paper, we introduce a sub-band direction-of-arrival (DOA) estimation method suitable for employment within an automatic bearing tracking system. Inspired by the magnitude-squared coherence (MSC), we extend the MSC to the sub-band and propose the sub-band magnitude-squared coherence (SMSC) to measure the coherence between the frequency sub-bands of wideband signals. Then, we design a sub...

This paper presents a novel compressed sensing based track before detect (CS-TBD) algorithm. The proposed algorithm reconstructs the whole radar scenario (direction of arrival (DOA)Doppler plane) for each range gate at consecutive scans using an improved stagewise orthogonal matching pursuit (StOMP) algorithm, resulting in a three-dimensional range-DOA-Doppler space. It then performs temporal t...

ALGORITHMS FOR ADAPTIVE NOISE CONTROL IN NOISY DOPPLER ENVIRONMENTS ROBERT W. STEWART, STEPHAN WEISS, DAVID H. CRAWFORD Signal Processing Division, Dept. of Electronic and Electrical Engineering, University of Strathclyde, Glasgow G1 1XW, Scotland, UK Abstract. This paper discusses the convergence and tracking behaviour of LMStype algorithms in a certain type of environment, which is characteri...

Severity of aortic stenosis. The study by Garcia et al. (1) in this issue of the Journal has bearing on a long-standing clinical quandary: Doppler continuity aortic valve areas (2,3), taken in the context of typical catheterization valve area cutoff values (4,5), often appear to produce misclassification toward higher degrees of severity, particularly in patients with relatively mild obstructio...

We proposed two approaches to tracking moving target with bearing-only measurement through incorporating observer trajectory optimization into passive tracking systems. The two optimizers algorithm are designed separately, and they are independent of any state estimators, which make them possible to be combined with any state estimators to achieve high accuracy maneuvering/non-maneuvering targe...

Experimental data from the SACLANTCEN 1993 Mediterranean Experiment are reviewed to assess reduction of search space for localization and tracking an acoustic source in a three-dimensional environment. Key this goal is availability initial estimate range depth (called 2D guess); ambiguous bearing can be obtained guess through Environmental Signal Processing, ambiguity removed by searching only ...

AIMS Obesity has become a major health problem worldwide. Cardiovascular abnormalities have been described not only in obese adults but also in obese children and adolescents. The aim of the present study was to investigate left and right, systolic and diastolic ventricular dysfunction in obese paediatric patients without comorbidities using 2D speckle tracking longitudinal strain. METHODS AN...

GPS, Pseudolites (PL) and Inertial Navigation Systems (INS) exhibit complementary performance characteristics, advantage of which can be taken through integration. System integration can be made at different levels, namely loose coupling, tight coupling and ultra-tight coupling, depending on the desired robustness (vs complexity) of the of the overall system design. In ultra-tight integration, ...

The architecture of the ultra-tight GPS/INS/PL integration is the key to its successful performance; the crux of this architecture is the Doppler feedback to the GPS receiver tracking loops. This Doppler derived from INS, when integrated with the carrier tracking loops, removes the Doppler due to vehicle dynamics from the GPS/PL signal thereby warranting a significant reduction in the carrier t...