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This paper presents a compartmental filtering method to improve signal-to-noise ratio (SNR) of the radio-echo sounding (RES) data of ice sheets while preserve weak signals in the deep layers. The proposed method performs local low-rank filtering on different internal layers of ice sheet to avoid weak signals from being filtered by global denoising methods. Experimental results show that the proposed...
The singularity expansion method (SEM) assumes that the electromagnetic scattering wave of an object has a fixed poles distribution, i.e. the resonant frequency is fixed. So the object can be identified by extracting poles from radar data. While studying ground penetrating radar (GPR) echo signal features of nonmetallic pipelines, the paper finds that the GPR signal's frequency center downshifts when...
In this paper, according to the two design principles of uniform distribution and less element shadowing for effective aperture, a novel two-dimensional (2-D) sparse ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna array topology is proposed for near-field high-resolution imaging. Compared with another different array having the same number of transceivers, the proposed optimal array...
Ground penetrating radar (GPR) velocity tomography has shown much promise in the detection of geological hazardous bodies. Using GPR velocity tomography technology, faults parallel to the transmission direction can be more accurately detected than faults perpendicular to transmission direction. This indicates that ray coverage has a great influence on inversion accuracy. In order to identify accurately...
This paper presents a indices-based dispatching support system which provides a hierarchical multi-level multi-department structure to combines a management-level and technical level to the system operators. By digging a “past” state, monitoring a “present” state and forecasting a “future” state, a comprehensive system operation can be realized. The advanced dispatching operation can be further provided...
The paper presents an adaptive and responsive service framework that integrates context aware techniques with an open source service oriented platform OSGi. The adoption of context aware techniques will allow the proposed service framework to dynamically and effectively manage services resources in response to in-bound tasks identified by the framework. The core services (i.e system services) of the...
This paper presents a new approach to the problem of system decomposition in a power system state estimation problem. The complexity of power systems is growing thus challenging the way measurements for state estimation are traditionally managed. Following a previous experience in defining a decentralized solution for state estimation, the authors here propose a procedure to automatically identify...
Path planning is an effective means to improve the operational effectiveness of aircrafts. A reasonable estimation and description of threats existing in operation space are significant before generating a specific path for an aircraft. To avoid depending on experts' experience excessively when we evaluate the threat situations, an index based threat modeling method named IBTMM is proposed. IBTMM...
An anisotropic flat index (AFX) is among the operational BRDF and albedo products offered in both the V004 and V005 reprocessed versions. We examine this BRDF shape indicator with 20 ground multiangular data sets as well as MODIS satellite samples, and find that the AFX routinely captures the BRDF shape. An AFX < 1.0 indicates a dome shaped anisotropic pattern with prominent backscatter peak reflectances,...
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