The results of an experiment combining Doppler beam steering (DBS) and angle of arrival (AOA) measurements are presented. Non-zero values of vertical beam AOAs and oo-zenith DBS power measurements have been attributed to the action of tilted specular layers by various authors. This study aims to directly compare the two sets of measurements in an eeort to determine whether the action of tilting...

This paper describes a design effort for a prototype ultra-wideband (UWB) tracking system that is currently under development at NASA Johnson Space Center (JSC). The system is being studied for use in tracking of lunar/Mars rovers during early exploration missions when satellite navigation systems are not available. The UWB technology is exploited to implement the tracking system due to its pro...

This paper extends the low complexity, Matrix Pencil direction of arrival (DOA) estimation algorithm to the CDMA case. The CDMA processing gain is used to suppress interfering signals, allowing Matrix Pencil to accurately estimate the DOA of the signal of interest. It is shown here that this CDMA/MP algorithm is able to estimate an angle of arrival (AOA) with a low mean square error using only ...

In this report we present an analysis of the non-random and the Bayesian Cramer-Rao lower bound (CRLB) for the joint estimation of angle-of-arrival (AoA), angle-of-departure (AoD), and the multipath amplitudes, for the millimeter-wave (mmWave) wireless networks. Our analysis is applicable to multipath channels with Gaussian noise and independent path parameters. Numerical results based on unifo...

294 Abstract — In this paper the beamforming and radiation pattern of various linear and planar phased antenna arrays configurations are presented. They are intended for use in indoor location estimation and wireless process monitoring applications based on the determining of direction-of-arrival (DOA) of radio signals by measuring the angle-of-arrival (AOA). Beamforming and the steering of ant...

This paper investigates the linear separation requirements for Angle-of-Arrival (AoA) and range sensors, in order to achieve the optimal performance in estimating the position of a target from multiple and typically noisy sensor measurements. We analyse the sensor-target geometry in terms of the Cramer-Rao inequality and the corresponding Fisher information matrix, in order to characterize loca...

Passive positioning systems with a small aperture array exhibit poor accuracy of target estimation in far-field environments. To improve this accuracy, this paper presents a novel angle-of-arrival (AOA)-based cross-localization algorithm for direction finding using orientation angle. Improved geometric and numerical target-positioning models are constructed after analyzing the mechanism of the ...

Jittering effects significantly degrade the performance of UAV millimeter-wave (mmWave) communications. To investigate impacts jitter on mmWave communications, we firstly model channel based geometric relationship between element antennas uniform planar arrays (UPAs). Then, extract (I) attitude angles & position coordinates and (II) angle arrival (AoA) departure (AoD) channel, also derive distr...

This article addresses the underwater acoustical localization problem by using time-difference-of-arrival (TDOA) and bearing-angle-of-arrival (BAOA) measurements. For acoustic equipment, such as ultrashort baseline system (USBL), whose bearing measurements are different from traditional angle-of-arrival (AOA) model, a closed-form solution for hybrid TDOA/BAOA-based source is developed. However,...