Approaches for instantaneous passive source localization using a towed horizontal receiver array in a random range-dependent ocean waveguide are examined. They include: (1) Moving array triangulation, (2) array invariant, (3) bearings-only target motion analysis in modified polar coordinates via the extended Kalman filter, and (4) bearings-migration minimum mean-square error. These methods are ...

The attenuation of coherent and random noise still poses technical challenges in seismic data processing, especially in onshore environments. Multichannel Singular Spectrum Analysis (MSSA) is an existing and effective technique for random-noise reduction. By incorporating a randomizing operator into MSSA, this modification creates a new and powerful filtering method that can attenuate both cohe...

In this paper, an improved inertial frame alignment algorithm for a marine SINS under mooring conditions is proposed, which significantly improves accuracy. Since the horizontal alignment is easy to complete, and a characteristic of gravity is that its component in the horizontal plane is zero, we use a clever method to improve the conventional inertial alignment algorithm. Firstly, a large mis...

Tilt-horizontal coupling in inertial sensors limits the performance of active isolation systems such as those used in gravitational wave detectors. Inertial rotation sensors can be used to subtract the tilt component from the signal produced by horizontal inertial sensors, but such techniques are often limited by the sensor noise of the tilt measurement. A different approach is to mechanically ...

Based on regression analysis this paper gives a description for simple image filter design. Specifically 3 3 filter implementations of a quadratic surface, residuals from this surface, gradients and the Laplacian are given. For the residual a 5 5 filter is given also. It is shown that the 3 3 filter for the residual gives low values for horizontal and vertical lines and edges as opposed to diag...

This paper is a study on image noise reduction of modified sigma filter using image decomposition. Conventional sigma filter has been shown to be a good solution both in terms of filtering accuracy and computational complexity. However, the sigma filter does not preserve well small edges especially for high level of additive noise. In this paper, we propose here a new method using a modified si...

We have designed a micro parallel positioning platform with two translational motions and a rotational motion that can tilt through large angles. Combined with a laser source mounted on its own slide, the platform can be used to produce fully three-dimensional micro-scale components. We investigate the kinematics, workspace, Jacobian matrix, and singularities of this parallel mechanism, and ana...

The essay is divided into three major sections. The middle contains three letters written by Susanna Moodie in Belleville in the late 1850s to Richard Bentley, her English publisher. These detail her growing interest in and resistance to the spiritualist movement, an interest which culminates in her active involvement, described in the final letter. Section I provides information about the move...