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A multi-constellation GNSS RF front-end with an integer-N PLL has been implemented for Compass and GPS applications in a 0.35μm SiGe BiCMOS process. A LNA in common-emitter topology with a noise figure of 1.7dB is integrated on the chip. An inter-N PLL based frequency synthesizer is designed to generate different local oscillator (LO) signals for down-converting the received Compass/GPS signals in...
Traditional methods based on bag-of-word representation are easily affected by noise, and they also cannot handle the problem when a test distribution differs from the training distribution. In this paper, we propose a novel method for human action recognition by bagging data dependent representation. Different with traditional methods, the proposed method represents each video by several histograms...
In traditional bag-of-words method, each local feature is treated evenly for representation. One disadvantage of this method is that it is not robust to noise, which makes the performance impaired. In this paper, a novel human action recognition approach which learns weights for features is proposed, where each feature is assigned a weight for human action representation. These weights are learned...
Array manifold error is the key factor which influences the performance of DOA algorithm. In ship borne radar, after distance and velocity resolution, the corresponding spatial azimuth of first-order sea echo can be computed. The first-order sea echo on the fixed frequency can be considered as scale source. After array covariance matrix's eigen value decomposition, the vector corresponding to the...
This paper discuss the detection Sobel edge dete ction prohibit of operator, The edge detection operator effect slove the problem of positioning, Uesing the high-pass Butter worth filter and Sobel edge detection operator, which effectivel y solve this problem. We use DSP programming environment to verify the feasibility of the method and experimental result s verify the proposed. this method is very...
Based on the suppression of Gaussian noise using higher-order statistical quantity, processing of several communication signals --BPSK, OQPSK, MSK, GMSK with Gaussian noise at a low SNR was carried out. Simulation results prove that BPSK signal has a good processing result at low SNR using bi-spectrum. Target detection at low SNR was carried out under Non-Gaussian noise, which proves that a low SNR...
In this paper, a digital image watermark algorithm based on discrete wavelet transform and chaos theory is referred. During the embedding of the watermarking, discrete wavelet transform is done firstly and extract low frequency part as the embedding field; then the chaotic sequence is used to encrypt the watermark and transform the encrypted part and extract the low frequency; finally, embed the low...
In this study, in order to improve the effectiveness of abnormal signal detection, we first develop a novel parasitic discrete wavelet transform (P-DWT) to perform fast wavelet instantaneous correlation (F-WIC) and then propose a new design method of the parasitic filters for the P-DWT. Furthermore, we show a judgment standard for assessing the credibility of the abnormal signal detection by using...
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