TY - GEN
T1 - An analysis of phase synchronization mismatch sensitivity for coherent MIMO radar systems
AU - Godrich, Hana
AU - Haimovich, Alexander M.
AU - Poor, H. Vincent
PY - 2009
Y1 - 2009
N2 - In this study, the hybrid Cramer-Rao bound (CRB) is developed for target localization, to establish the sensitivity ofthe estimation mean-square error (MSE) to the level of phase synchronization mismatch in coherent Multiple-Input MultipleOutput(MIMO) radar systems with widely distributed antennas. The lower bound on the MSE is derived for the joint estimation of the vector of unknown parameters, consisting of the target location and the mismatch of the allegedly known system parameters, i.e. phase offsets at the radars. Synchronization errors are modeled as being random and Gaussian. A closed-form expression for the hybrid CRB is derived for the case of orthogonal waveforms. The bound on the target localization MSE is expressed as the sum of two terms, the first represents the CRB with no phase mismatch, and the second captures the mismatch effect. The latter is shown to depend on the phase error variance, the num ber of mismatched transmitting and receiving sensors and the system geometry. For a given phase synchronization error variance, this expression offers the means to analyze the achievable localization accuracy. Alternatively, for a predetermined localization MSE target value, the derived expression may be used to determine the necessary phase synchronization level in the distributed system.
AB - In this study, the hybrid Cramer-Rao bound (CRB) is developed for target localization, to establish the sensitivity ofthe estimation mean-square error (MSE) to the level of phase synchronization mismatch in coherent Multiple-Input MultipleOutput(MIMO) radar systems with widely distributed antennas. The lower bound on the MSE is derived for the joint estimation of the vector of unknown parameters, consisting of the target location and the mismatch of the allegedly known system parameters, i.e. phase offsets at the radars. Synchronization errors are modeled as being random and Gaussian. A closed-form expression for the hybrid CRB is derived for the case of orthogonal waveforms. The bound on the target localization MSE is expressed as the sum of two terms, the first represents the CRB with no phase mismatch, and the second captures the mismatch effect. The latter is shown to depend on the phase error variance, the num ber of mismatched transmitting and receiving sensors and the system geometry. For a given phase synchronization error variance, this expression offers the means to analyze the achievable localization accuracy. Alternatively, for a predetermined localization MSE target value, the derived expression may be used to determine the necessary phase synchronization level in the distributed system.
KW - Hybrid CRB
KW - Localization
KW - MIMO radars
KW - Mismatch parameters
UR - http://www.scopus.com/inward/record.url?scp=77951140636&partnerID=8YFLogxK
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U2 - 10.1109/CAMSAP.2009.5413314
DO - 10.1109/CAMSAP.2009.5413314
M3 - Conference contribution
AN - SCOPUS:77951140636
SN - 9781424451807
T3 - CAMSAP 2009 - 2009 3rd IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing
SP - 153
EP - 156
BT - CAMSAP 2009 - 2009 3rd IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing
T2 - 2009 3rd IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, CAMSAP 2009
Y2 - 13 December 2009 through 16 December 2009
ER -