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This paper presents a localization algorithm to detect lung sounds using a circular array of microphones. We use the natural basis functions of propagation waves in height invariant wavefields to form a spatial minimum variance (MV) problem in eigen space. We also derive a Nyquist criteria for localizing sources within a circular region. This Nyquist criteria shows that the radius of the region where...
The paper presents some most important design issues of antennas with modelled monopulse radiation pattern in both azimuth and elevation, especially of dielectric substrate microstripe antenna structures. An approach to optimisation of the antenna patterns is discussed and an example of circular antenna array solution is presented. The issue of feeding such antenna arrays is discussed. The solution...
This paper presents a broadband pattern synthesis technique which steers a broad null in a given sector using a constraint derived from an integrated power response over the sector, specifies the frequency response in an arbitrary look direction without using presteering delays and cancels unwanted directional interferences by minimizing the mean output power of the processor.
This paper presents a broadband antenna array pattern synthesis technique with the capability to steer a main beam of specified frequency response in a desired direction without presteering the array. Sidelobes are controlled using a weighting function in the integrated power response of the array in such a way that the array response drops as the distance from the look direction increases. Using...
In this paper a robust and adaptive method of circular object detection is proposed. The proposed method aims to limit the need for parameter adjustment when applied to a wide range of different images, by implementing a hybrid algorithm using the circular Hough transform for region segmentation, and a refined localised version of the Randomized Circle Detection algorithm to perform circular object...
Most digital camera uses the color filter array to reduce the cost and size. When we use the color filter array, however, we need to interpolate the missing color components. In this paper, we propose an advanced directionally weighted demosaicing algorithm for the color filtered images of the single-sensor digital camera. The proposed algorithm estimates the missing pixels by summing weighted color-differences...
A modified adaptive noise cancelling (ANC) hybrid algorithm incorporating techniques of optimal wideband FIR filtering operation and the trimmed mean (TM)-levelization, a dynamic level-based thresholding process, is described in this paper for wideband active sonar echolocation system. This novel technique performs effective suppression of unwanted part of the training data thus localizing potentials...
We present the design of a randomly distributed radio frequency signal detection and reception array constructed of wireless sensor network nodes. The design stresses initial signal detection using the wireless network array. All other array operations depend on first detecting a signal of interest prior to activating follow-on sequences of signal processing, potentially including geolocation of the...
We consider the fundamental ability of multisensor receiver of finite spatial extent to localize a wireless transmitter in space. Spatial localization is identified with a multisensor receiver's ability to distinguish source transmitters from different regions in space based on imperfect measurements within the finite spatial extent spanned by the receiver's sensors. Two transmitters positioned within...
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