The estimation of the directions of arrival of the spread-spectrum signals with three orthogonal sensors

Xin Wang, Zong-xin Wang
2002 IEEE Transactions on Vehicular Technology  
An effective technique in estimating the directions of arrival (DOAs) of incoming signals using three orthogonal sensors is proposed. The model of channel with multipath transmissions for code-division multiple access (CDMA) users whose signals are modulated with binary phase-shift keying (BPSK) is used. Utilizing the maximum-likelihood (ML) method, the channel impulse response vectors of three sensors can be estimated, then all of the corresponding propagation delays and amplitude weights of
more » ... litude weights of three sensors' channels can be obtained respectively. By comparing the propagation delays of three sensors' channels, we can identify the same signal replica, then the DOI of it can be estimated by the relation of the three corresponding attenuation weights. Calculating results show this method can reach fairly high accuracy, and it needs only three sensors while in other techniques the required number of sensors is greater than the number of estimated signals. Index Terms-Direction of arrival (DOA), maximum-likelihood (ML) estimation, PN code, propagation delay and amplitude weight.
doi:10.1109/tvt.2002.801762 fatcat:t4rrgz5snfgltmyt5dowfjzesm