PLACEMENT OF CALIBRATION EARTH STATIONS FOR GROUND BASED BEAM FORMING IN A SATELLITE SYSTEM

摘要

A system and method for estimating calibration parameters and locating a Calibration Earth Station (CES) is described. The method may be performed offline. The method includes: providing LxM pilot signal measurements in a matrix R from L CESs and the M feed elements, wherein the matrix R comprises a set of channel coefficients c = {c1, c2,..., cM}, and k = {k1, k2,..., kL} perturbations; linking a subset of channel coefficients {c1, c2,..., cM} using each of the L CESs; and estimating a relative estimate of the k = {kl, k2,...,kL} perturbations across the L CESs by using each of the L CESs as a bridging element. In the method, the bridging element provides a strong pilot signal for at least two of the L CESs. A set of criteria for determining locations of CESs have been described. A set of desirable properties for the solution set of L CESs have been disclosed. A combination of inner loop and outer loop methods for determining the final set of optimal locations have been described.