TY - JOUR
T1 - DOA and steering vector estimation using a partially calibrated array
AU - Weiss, Anthony J.
AU - Friedlander, Benjamin
N1 - Funding Information:
This work was supported by the United States Army Research Office under Contract DAAL03-91-C-0022, sponsored by U.S. Army Communications Electronics Command, Center for Signals Warfare.
PY - 1996
Y1 - 1996
N2 - We consider the problem of estimating directions of arrivai (DOAs) using an array of sensors, where some of the sensors are perfectly calibrated, while others are uncalibrated. We identify a cost function whose minimizer is a statistically consistent and efficient estimator of the unknown parameters - the DOAs and the gains and phases of the uncalibrated sensors. Next we present an iterative algorithm for finding the .minimum of that cost function. The proposed algorithm is guaranteed to converge. The performance of the estimation algorithm is compared with the Cramer Rao bound (CRB). The derivation of the bound is also included. It is shown that DOA accuracy can be improved by adding uncalibra1[ed sensors to a precisely calibrated array. Moreover, the number of sources that can be resolved may be larger than the number that can be resolved by the calibrated portion of the array.
AB - We consider the problem of estimating directions of arrivai (DOAs) using an array of sensors, where some of the sensors are perfectly calibrated, while others are uncalibrated. We identify a cost function whose minimizer is a statistically consistent and efficient estimator of the unknown parameters - the DOAs and the gains and phases of the uncalibrated sensors. Next we present an iterative algorithm for finding the .minimum of that cost function. The proposed algorithm is guaranteed to converge. The performance of the estimation algorithm is compared with the Cramer Rao bound (CRB). The derivation of the bound is also included. It is shown that DOA accuracy can be improved by adding uncalibra1[ed sensors to a precisely calibrated array. Moreover, the number of sources that can be resolved may be larger than the number that can be resolved by the calibrated portion of the array.
UR - http://www.scopus.com/inward/record.url?scp=0030193922&partnerID=8YFLogxK
U2 - 10.1109/7.532263
DO - 10.1109/7.532263
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AN - SCOPUS:0030193922
SN - 0018-9251
VL - 32
SP - 1047
EP - 1057
JO - IEEE Transactions on Aerospace and Electronic Systems
JF - IEEE Transactions on Aerospace and Electronic Systems
IS - 3
ER -