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This paper presents a novel Ku-Band low profile antenna system for mobile sitcom. The antenna is designed in the shape of a four-to-one rectangle based on planar antenna array. The method of beam scanning tracking is used which is simple and efficient. The antenna can mechanically scan the communication satellite automatically from 0° to 90° in elevation and 360° coverage in azimuth, achieving remote...
In wireless communication environment, the time-varying channel and angular spread caused by multipath fading and the mobility of mobile degrade the performance of conventional direction of arrival (DOA) tracing algorithm. In this paper, we present a DOA tracking scheme for coherently distributed source based on support vector regression method. The mapping among the outputs of the array and the DOAs...
We propose a new two-stage approach to estimate the central direction-of-arrival (DOA) and angular spread of locally distributed source. In contrast to earlier works, an advantage of this method is that it has decoupled the central DOA and angular spread based on the steering vector which is a Schur-Hadamard product. So the central DOA can be estimated in a preliminary stage, and then angular spread...
We consider the problem of estimating the central direction of arrival (DOA) of a coherently distributed source. In this paper, the integral steering vector of coherently distributed source is deduced to be a Schur-Hadamard product comprising point source steering vector and a real vector. And then a blind estimator based on second order statistics is proposed to estimate the central DOA without adopting...
We consider the problem of estimating the parameters-the central direction of arrival (DOA) and angular spread of a coherently distributed source. This problem is encountered due to the presence of local scatterers in the vicinity of a transmitter or due to signals propagating through a random inhomogeneous medium. Since the computational complexity of the parameter estimation is normally highly demanding,...
Three coordinate laser scanner is one of the important equipments in geometric measurement and reverse engineering fields. The rapid development of manufacture precision towards precise or ultra-precise direction requires higher scanning precision. Calibration is the most direct, simplest method to check the measuring uncertainty of the scanner. This paper put forward a ball-plate based calibration...
A computationally efficient method for 2D direction-of-arrival (DOA) estimation of coherently distributed source is presented. The key idea is to construct second-order statistics calculated analytically based on the Schur-Hadamard product steering vector. So a closed form solution to 2D DOA estimation can be derived, which does not involve any eigendecomposition or singular value decomposition as...
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