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Multidimensional waveform encoding is a new multiple-input multiple-output (MIMO) technique for remote sensing. The orthogonality is acquired by digital beamforming in elevation. It has a potential to enhance ground moving target indication (GMTI) performance due to the larger along-track virtual array of the radar system. This paper proposed two modes for GMTI based on multidimensional waveform encoding:...
The embedded avionics system is a typical mission-critical and safety-critical system, and should ensure fulfillment of all constraints for all flows with individual timing requirements transmitted in networks. Scheduling strategies are used to meet this requirement, and different networking solutions have different approaches. AFDX (Avionics Full-DupleX Switched Ethernet) implements a SPQ (Strict...
EEG-based emotion recognition has received increasing attention in the past few decades. The frequency components that give effective discrimination between different emotion states are subject specific. Identification of these subject-specific discriminative frequency components (DFCs) is important for the accurate classification of emotional activities. This paper investigated the potential of adaptive...
The SMOS mission is developed for monitoring the surface soil moisture and ocean salinity by a two dimensional L-band synthetic aperture interferometric radiometer. However, artificial sources emitting in the protected L-band are contaminating the retrievals of the soil moisture and ocean salinity from the measurements. To mitigate the RFIs' impacts, the classical CLEAN algorithm was introduced and...
Radio frequency interference (RFI) has becoming a seriously limitation in the retrieval of geophysical parameters from the measurements of microwave radiometers. In this work, a novel RFI localization approach is presented here to improve the computationally complexity by using virtual arrays and direction of arrival (DOA) estimations techniques. The proposed RFI localization method utilizes the underlying...
Motor imagery based BCIs are one of the most important BCI paradigms. Although it has been studied for a long time, the EEG features for kinetic information of motor imagery are still less known. In this paper, we explored EEG patterns of hand force motor imagery. Six subjects participated in this study, who were required to imagine clenching their hands with two different levels of force during the...
Time-Triggered Ethernet (TTEthernet) improved from Avionics Full Duplex Switched Ethernet (AFDX) is supposed to enhance the determination by introducing time-triggered mechanism, while indeterminacy problem still exists in rate-constrained (RC) flows thus requiring worst-case latency analysis. Traditional network calculus model used for AFDX is not suitable for TTEthernet due to time-triggered (TT)...
Avionics Full-Duplex Switched Ethernet (AFDX) is aircraft switched data network. One characteristic of this safety-critical system is determinism which asks for end-to-end worst-case delay analysis of the flows transmitted over AFDX network. Trajectory Approach aims to analyze the worst-case transmitting scenario of one frame so as to calculate the worst delay it may experience. The computed maximum...
In traditional Power Flow (PF) formulations, the unbalancing power that caused by the transmission power loss (TPL) is provided by sole slack bus, which introduces some errors. Such errors are involved in the results of Continuation Power Flow (CPF) which is based on the parameterized PF formulations. Moreover, for certain class of systems, this kind of errors could be significant and few research...
In the whole life cycle of equipment, multi-source testability demonstration test data (TDTD) which may be acquired at different stages, in different environment and at different levels (system, subsystem or replaceable unit), can be used for testability integrated evaluation. However, the above multi-source data cannot be used for testability integrated evaluation directly for they share many distinctions...
The time-triggered principle establishes and maintains a system-wide synchronized time-base by the local clocks of the device. The proposed concept of Time-Triggered Ethernet (TTE) guarantees the determinacy of time-critical message for avionics and safety-critical systems. This paper presents an algorithm based on path-hop of tasks to generate a rational scheduling timetable to ensure is free of...
Rehabilitation method of motor dysfunction is a challenging issue of neural rehabilitation. Neuromuscular electrical stimulation (NMES) has been frequently used in rehabilitation therapy to improve neural recovery such as stroke and spinal cord injury. Stimulus, acting on sensorimotor neural system components, resulted in the increased cortical excitability which accompanied with motor performance...
For sparse Radar signals, sparse imaging method is subversion of the traditional imaging method, which breaks through the limitations existing in traditional imaging method. In order to improve the imaging quality of Radar signals, we don't only realize the sparse radar imaging algorithm, but also propose a new method for choosing regularization parameter in 2D radar imaging. The imaging result verifies...
The interpretation of Synthetic Aperture Radar (SAR) images of dynamic ocean scene is extremely complex, owing to the comprehensive mechanisms of ocean SAR imaging. Along-track Interferometric SAR (AT-InSAR) technique provides us a convenient tool to cope with these problems. But the lack of in-situ data of AT-InSAR is one of the most restricted factors for the further study of this technique. Simulation...
Time-Triggered (TT) communication, which enhances real-time requirement and packets transmission certainty, can satisfy the requirements of Distributed Integrated Modular Avionic (DIMA). Due to clock skew between source end and destination systems, the end to end performance is inaccurate. Therefore, clock synchronization service is crucial for TT messages transmission in Time-Triggered Ethernet (TTEthernet)...
The coherence and blind velocity are two important questions in multiple-input multiple-output (MIMO) radar ground moving target indication (GMTI). Multi-frequency signal is an effective way to solve the blind velocity problem, and multi-frequency signals are usually transmitted by MIMO radar. However, by this way the coherence is lost. This paper proposed an efficient way by circular-shift transmission...
Aperture synthesis measurements, also termed complex visibilities, are the sparse samplings in the (u,v) frequency plane, which causes undesirable side lobes in the synthesized beam. Through the side lobes, artificial sources emitting in the protected 1400–1427MHz band are contaminating the retrievals of the soil moisture and ocean salinity (SMOS) satellite launched by the European Space Agency (ESA)...
Radio frequency interference (RFI) is one of the most significant limiting factors in the retrieval of geophysical parameters measured by microwave radiometers. In this work, based on the measured visibilities of European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission, RFI mitigation results are presented using two approaches of array factor synthesis of synthetic aperture interferometric...
For sparse signals (direct or indirect), sparse imaging methods can break through limitations of the conventional SAR methods. In this paper, we introduce the basic theory of sparse representation and reconstruction, and then implements several imaging algorithms including FFT and sparse methods. Through comparison, we conclude a good sparse reconstruction algorithm in SAR imaging. Besides, a new...
By analyzing physical connection of cognitive radio network, underlay color-sensitive graph coloring (UCSGC) model which is used in underlay spectrum allocation is proposed here. After analyzing, color-sensitive graph coloring (CSGC) is a special UCSGC. Under the model, this paper gives an Optimized Genetic Algorithm (OGA) to maximize the benefits of the network. The algorithm not only is convergent,...
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