EFFECT IN RANGE DIFFERENCE POSITION ESTIMATION DUE TO STATIONS POSITION ERRORS

This work addresses the subject of systematic errors caused by using i ncorrect coordinates for the sites where the stations are located in a three-dimensional aircraft position estimation system, composed of on e transmitter/receiver and three receiving stations. The differences i n the aircraft ranges from the receiving stations are used to derive t he position estimate, A general analytic expression is developed to as sess the error resulting from using erroneous coordinates for the rece ivers location. Evaluation has been performed for certain representati ve conditions.