LOCALIZATION METHOD BASED ON GAUSS-NETWON METHOD USING TDOA/FDOA, AND LOCALIZATION APPARATUS USING THE SAME

摘要

PURPOSE: A signal source location estimating method and a signal source location estimating apparatus using the same are provided to simultaneously use time difference of arrival (TDOA) and frequency difference of arrival (FDOA), thereby improving the accuracy of location estimation. CONSTITUTION: A signal source location estimating method includes following steps. A location and speed vector estimation value about the location and speed vector of a radar signal source is set, and an initial value about transmission value is set (S110). A TDOA and FDOA estimation value is calculated using the location and speed vector estimation value and the transmission value set by the initial value (S120). A difference value between a TDOA and FDOA measurement value measured in a receiving part and the TDOA and FDOA estimation value is calculated (S130). A Jacobian matrix is generated by differentiating each of a TDOA model equation and an FDOA model equation which are prepared in advance using the TDOA and FDOA estimation value (S140). A weighted value for altering the location and speed vector estimation value is calculated using the difference value and the Jacobian matrix, and the location and speed vector estimation value is altered using the weighted value (S150). In case the difference value is higher than a permissible threshold value or the repeated number of control procedures in previous steps is lower than a maximum value, the control procedures in the previous steps are performed again (S160). If the difference value is lower than the permissible threshold value and the repeated number of the control procedures is higher than the maximum value, an altered location and speed vector estimation value is determined as a final location speed vector of the radar signal source (S170). [Reference numerals] (AA) Start; (BB) End; (S110) Set an initial value; (S120) Calculate a TDOA and FDOA estimation value; (S130) Calculate the difference value between a TDOA and FDOA measurement value and the TDOA and FDOA estimation value; (S140) Generate a Jacobian matrix; (S150) Alter the location and speed vector estimation value; (S160) Confirm whether the difference value is higher than a permissible threshold value; (S170) Determine the location and speed