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Indoor positioning methods based on the received signal strength indication (RSSI) ranging technology are sensitive to various environmental noises, which cause positioning errors. An improved Wi-Fi indoor positioning method using an improved unscented Kalman filter and the particle swarm optimization (PSO) is proposed to reduce ranging error and improve positioning accuracy. The received signals...
In this paper, we consider the direction-of-arrivals (DOAs) estimation of coherent narrowband signals impinging on an arbitrary linear array in a computational efficient way. A new interpolation transform based modified Capon beam-forming method is proposed without eigendecomposition, where the arbitrary linear array is transformed to a virtual uniform linear array (ULA) by utilizing the interpolation...
In this paper, we consider a millimeter wave (mmWave) multiple-input multiple-output (MIMO) communication system with hybrid beamforming architecture. To search the optimal beam pair, the beam sweeping algorithm is complex and time-consuming in the case of initial access and beam switching. With the aim of improving the robustness, we propose a novel beam management scheme to quickly determine the...
Visual tracking is challenging due to appearance changes caused by motion, illumination, occlusion and pose, among others. For these local changes, appearance model based tracking algorithms, such as MILtracker [8], have adopted local features and most recently extended to compressive domain, namely Compressive Tracking [13], for the real-time performance. However, the motion information is missed...
To ensure that the project risk assessment is scientific, firstly, a risk estimate matrix based on matrix method is established according to the trait of project risk assessment. Then using concentrated numeric statistic method and interval fuzzy processing method, the estimated data is analyzed. Finally, the method is applied to a software project risk evaluation, the result fully demonstrates its...
Doppler frequency rate-of-change of a radar signal is an important parameter in passive location, but it is too subtle to accurately estimate in a single pulse. In this paper, an algorithm of Doppler frequency rate-of-change estimation is presented. A new chirp signal is obtained after intrapulse correlation accumulation by using discrete Fourier transform (DFT). Dechirping of the new chirp signal...
In this paper, we propose an efficient blind timing skews estimation (TSE) method for TIADC systems by evaluating the autocorrelation of the analog input signal and the mean squared difference between the output samples of the two adjacent sub-ADCs. By approximating the input signal autocorrelation function using the second order Maclaurin series, an analytical solution of the blind TSE using noise...
A multi-layer adaptive optimizing parameters algorithm is developed for improving least squares support vector machines (LS-SVM), and a military equipment intelligent cost estimation model is proposed based on the optimized LS-SVM. The intelligent cost estimation process is divided into three steps in the model. In the first step, cost-drive-factor is needed to be selected, which is significant for...
To solve the problems in engineering cost prediction, such as unscientific predicting techniques, high work-load and the low veracity, cost-significant theory is used to find out cost-significant items and factors. According to lots of historical time data, the auto-correlation method, G-P arithmetic and calculating Lyapunov exponent is adopted, which simplified the trouble and high work-load of estimation...
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