A method for determining calibration constants for calibrating a receive only phased array antenna comprising the steps of: providing a pair of transmit signals i and j (15, 17) with unknown polarization; identifying known parameters including a location x n of an antenna element n of said phased array antenna, an orientation Δ x n of said antenna element n, polarization of element n relative to the orientation of element n, and a location of a transmitter x 1 (14, 15); identifying unknown parameters including weights w n of the elements and vertical magnitude E v and horizontal magnitude E h of each of said transmit signals (15, 17); determining a receive signal at each of said antenna elements (18 1 -18 n) based on said transmit signals (15, 17), where ξ is the energy received at an element; defining six simultaneous equations with seven unknowns using one antenna element p as a standard, a second antenna element m, where m ≠ p, and a third antenna element n, where n ≠ p and n ≠ m; said six simultaneous equations being: A i, n B i, n 0 0 ξ n, i 0 0 A i, m B i, m 0 0 0 ξ m, i 0 A i, p B i, p 0 0 0 0 ξ p, i 0 0 A j, n B j, n ξ j, n 0 0 0 0 A j, m B j, m 0 ξ m, j 0 0 0 A j, p B j, p 0 0 ξ p, j E v, i E h, i E v, j E h, j w n w m w p = 0 0 0 0 0 0 where; A i, n ≡ e − jkr i, n r i, n Δ x n → • e ^ v B i, n ≡ e − jkr i, n r i, n Δ x n → • e ^ h wherein ê ν is the unit vector in vertical direction and ê h is the unit vector in horizontal and direction, r i, n ≙ r → n − r → ′ i, defining the distance between source i to the location of element n solving said six simultaneous equations for weights for every possible set of three antenna elements to find a vector of calibration weight for each antenna element (18 1 -18 n); and averaging said calibration weights for each antenna element (18 1 -18 n). providing a pair of transmit signals i and j (15, 17) with unknown polarization; identifying known parameters including a location x n of an antenna element n of said phased array antenna, an orientation Δ x n of said antenna element n, polarization of element n relative to the orientation of element n, and a location of a transmitter x 1 (14, 15); identifying unknown parameters including weights w n of the elements and vertical magnitude E v and horizontal magnitude E h of each of said transmit signals (15, 17); determining a receive signal at each of said antenna elements (18 1 -18 n) based on said transmit signals (15, 17), where ξ is the energy received at an element; defining six simultaneous equations with seven unknowns using one antenna element p as a standard, a second antenna element m, where m ≠ p, and a third antenna element n, where n ≠ p and n ≠ m; said six simultaneous equations being: A i, n B i, n 0 0 ξ n, i 0 0 A i, m B i, m 0 0 0 ξ m, i 0 A i, p B i, p 0 0 0 0 ξ p, i 0 0 A j, n B j, n ξ j, n 0 0 0 0 A j, m B j, m 0 ξ m, j 0 0 0 A j, p B j, p 0 0 ξ p, j E v, i E h, i E v, j E h, j w n w m w p = 0 0 0 0 0 0 where; A i, n ≡ e − jkr i, n r i, n Δ x n → • e ^ v B i, n ≡ e − jkr i, n r i, n Δ x n → • e ^ h wherein ê ν is the unit vector in vertical direction and ê h is the unit vector in horizontal and direction, r i, n ≙ r → n − r → ′ i, defining the distance between source i to the location of element n solving said six simultaneous equations for weights for every possible set of three antenna elements to find a vector of calibration weight for each antenna element (18 1 -18 n); and averaging said calibration weights for each antenna element (18 1 -18 n).