Abstract
Resolution capability is an important metric for radar parameter estimation. However, the resolution limit for multi-parameters estimation has not been adequately studied. In this paper, we exploit results from Shannon's information theory to derive a joint resolution limit (JRL) for range and direction of arrival (DOA) estimation in MIMO radar. Based on the general model, the closed-form expression of scattering information is obtained for two targets with complex Gaussian scattering properties. A critical state is considered where the quadrature component of the scattering information is 1 b and corresponding intervals of range and DOA are defined as the JRL. Under the assumption of closely-spaced targets, the approximated explicit JRL is derived by a second-order Taylor series, which indicates that the JRL is inversely proportional to the number of array elements, the square root of the signal to the noise ratio, and the signal bandwidth to the carrier frequency ratio. Also, closed-form approximations for range resolution limit and DOA resolution limit are obtained as special cases. It is indicated that these resolution limits are general and not based on any specific resolution method. The accuracy and the validity of the proposed resolution limits are verified by numerical simulations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callSimilar Papers
More From: IEEE Transactions on Aerospace and Electronic Systems
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
