Hyperbolic localization method for MIMO radar

Classic localization methods in conventional radar cannot be used to multiple-input multiple-output radar directly. In this paper, we proposed a new localization model for MIMO radar system, which make hyperbolic location method can be extended to MIMO radar. TOAs equations are build from multipath between transmitters and receivers to estimate the target position. The equations are redundant since number of paths is more than number of target coordinates. Our new model makes full use of redundant paths to decrease the impact of TOA measurement errors and improve estimation accuracy. Then, we proposed a two-steps method to solve the overdetermined and nonlinear TOAs equations. Different with conventional Taylor expansion method, which needs an initial position closed to the target and iterative process is necessary, we calculate the initial position in first step and use partly Taylor expansion and BLUE algorithm in the second step to obtain accurate results. GDOP performance of the new method is analyzed. CRLB of the proposed algorithm is derived as well and localization error of new algorithm is almost equal to CRLB which prove the value of the new method.