A technique is presented for estimating the primary measurements of forward scatter radar with a planar array. The space-timeprocessing based on three-dimensional discrete Fourier transform is employed and the comput...
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ISBN:
(纸本)9781785610387
A technique is presented for estimating the primary measurements of forward scatter radar with a planar array. The space-timeprocessing based on three-dimensional discrete Fourier transform is employed and the computation is reduced without loss of accuracy. By analyzing the Cramer-Rao lower bound, the performance of the given approach is shown. Meanwhile, the effect of the target's complex scatter coefficient to the Doppler measurement is noticed. Numerical simulation presents an estimation of primary measurements with good accuracy.
Smart noise jamming based on digital radio frequency memory (DRFM) has both oppressive jamming effect and deceptive jamming effect, and it is difficult to be effectively suppressed by traditional anti-jamming methods....
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Dear editor,Fast Fourier transform(FFT)is one of the most fundamental algorithms used in digital signal *** applications such as orthogonal frequency division multiplexing(OFDM),long term
Dear editor,Fast Fourier transform(FFT)is one of the most fundamental algorithms used in digital signal *** applications such as orthogonal frequency division multiplexing(OFDM),long term
SyntheticAperture Radar (SAR) has the ability to work inevery hour, under all weather conditions. The multichannel SAR well solved the dilemma between the swathcoverage and the azimuth resolution. However in reality, ...
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ISBN:
(纸本)9781785610387
SyntheticAperture Radar (SAR) has the ability to work inevery hour, under all weather conditions. The multichannel SAR well solved the dilemma between the swathcoverage and the azimuth resolution. However in reality, the phase equalization of each sub-channel is influencedby many unideal factors, which can degrade the imagequality. In this paper, firstly the main factors are summarized and their effects are calculated. Then the interferometric phasemethod is introduced to compensate the phase error. Finally we applied the following methods of error estimation and compensation in the channel uncertainty simulation and get a good imagining result.
Aircraft detection in optical remote sensing image is an important research direction in the field of remote sensing. The existing detection methods are difficult to achieve satisfactory results. Traditional detection...
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The remote sensing object detection algorithms based on deep learning have high detection performances, but the network structures are too complexity to meet the real-timeprocessing requirements in on-board remote se...
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作者：
Xi, YingLiu, HaiboWang, YanhuaLi, YangRadar Research Lab
School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China
Scatter center matching is one of the choke points of radar automatic target recognition (RATR) based on Synthetic Aperture Radar (SAR). Accuracy of scattering center extraction is an important factor affecting target...
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Microblog is a social platform with huge user community and mass data. We propose a semantic recommendation mechanism based on sentiment analysis for microblog. Firstly, the keywords and sensibility words in this mech...
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Microblog is a social platform with huge user community and mass data. We propose a semantic recommendation mechanism based on sentiment analysis for microblog. Firstly, the keywords and sensibility words in this mechanism are extracted by natural language processing including segmentation, lexical analysis and strategy selection. Then, we query the background knowledge base based on linked open data （LOD） with the basic information of users. The experiment result shows that the accuracy of recommendation is within the range of 70% -89% with sentiment analysis and semantic query. Compared with traditional recommendation method, this method can satisfy users＇ requirement greatly.
Synthetic aperture radar (SAR) plays an indispensable role in national defence and civil fields due to its unique advantages. Although many methods have been proposed, the recognition to SAR images still faces many di...
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Aiming at the fact that traditional cache replacement strategy lacks pertinence to the semantic cache in the process of extensible markup language （XML） algebra query, a replacement strategy based on the semantic ca...
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Aiming at the fact that traditional cache replacement strategy lacks pertinence to the semantic cache in the process of extensible markup language （XML） algebra query, a replacement strategy based on the semantic cache contribution value is proposed. First, pattern matching rules for XML algebra query and semantic caches are given. Second, the method of calculating the semantic cache contribution value is proposed. In XML documents with four different sizes, the experimental results of time efficiency show that this strategy supports environment of the XML algebra query and it has better time efficiency than both least frequency used （LFU） and least recently used （LRU）.
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