A nonlinear system model of maneuvering target detection was introduced. To estimate offset angles of pitch and azimuth, relative velocity of missile and target, and distance information while detecting maneuvering target, extended Kalman filter algorithm was introduced. Simulations of nominal trajectory and extreme trajectory shows that the proposed system model and filter design approach can ...

Aimed at the problem of large error caused by uncertain factors in fitting process traditional multiplicative seasonal model, advantages Markov chain this study are applied to model optimize prediction results. Based on residual value between theoretical and actual values, values different intervals divided into states. The transition probability matrix is established through probabilities; the...

Recent implementations of virtual sound using head related transfer functions often include an analytical low frequency diffraction model to reproduce stable azimuth cues which are independent of the quality and accuracy of high frequency pinnae data. This paper investigates the previously neglected effects of surface acoustic impedance on the salient azimuth cues produced by a single sphere di...

Changes in velocity of the large outlet glaciers and ice streams in Antarctica are important for ice sheet mass balance and hence sea level. The ice flow velocity is also a critical variable in understanding glacier dynamics. Polar Record Glacier, with a calved iceberg in front, is about 50 km to the west of the Zhongshan Station, East Antarctica. SAR interferometry can detect the surface displ...

I present two methods for constructing angle gathers in 3-D seismic imaging by downward extrapolation. Angles in angle gathers refer to the scattering angle at the reflector and provide a natural access to analyzing migration velocity and amplitudes. In the first method, angle gathers are extracted at each downwardcontinuation step by mapping transformations in constant-depth frequency slices. ...

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT During logging-while-drilling (LWD) operations, complex drill string movements and the weight of the drill...

Seismic methods play an important role in the development of tight fractured reservoirs with substantial spatial variability of fracture density. Here, we apply a comprehensive processing sequence designed for layered azimuthally anisotropic media to wide-azimuth P-wave data acquired over a fractured gas sand formation in the Rulison field, Colorado. The main processing steps include nonhyperbo...

A four-polarisation camera was used to map the absorbance of olivine micro-grains before and after high-temperature annealing (HTA). It is shown that HTA xenoliths at above 1200 °C in O2 flow makes them magnetised. Different modes operation polariscope with polarisation control sample transmission reflection were used. The type assembled for non-transparent samples HTA. optical observation plac...