A Method of Dual-Satellites Geolocation Using TDOA and FDOA and Its Precision Analysis

Abstract

To solve the problem of locating the fixed emitter with known altitude by dual satellites using time difference of arrival(TDOA) and frequency difference of arrival(FDOA) information,an analytic solution in three dimensional spaces is presented.This method could get the solution not only when the direction of satellites moving is different from the directions of two satellites line,but also get the solution when the directions are the same.Its geolocation error is analyzed in theoretically as well as by Monte-Carlo simulation.And the analytic statement of location error was got.The analysis reviewed that the direction of dual-satellites had better be parallel to the line of two satellites to make large location error area smaller.