DGPS-BASED AIRCRAFT FLIGHT GUIDANCE TEST SYSTEM

The utilization of the GPS system for Aircraft Flight Guidance/Test (A FGT) is still currently a new research project in China. The paper des cribes the concepts and the technical realization of such a system, in cluding three components: ground subsystem, on-board subsystem and dat a communication link using TDMA technique. The purpose of the proposed AFGT system is to calibrate and verify performance of an on-board rad ar. Therefore, it must meet the requirements of evaluation of radar pe rformances in several areas: accuracy, coverage range, and others. The AFGT System's displays are separately: a Moving Colored Digital Map o n which flight trajectories, waypoints, and heights of aircrafts are c learly marked; and a Polar Coordinate Figure on which the bearings, he adings, and distances of aircrafts relative to the origin of the groun d control center are shown. The AFGT may monitor and guide several air crafts flying in the pointed airspace. It support airport surface surv eillance and air traffic control at the terminal area. A real-time sof tware package RTTEST, which includes tracking display software and on- flight test software for radar evaluation, has conducted simulation wi th satisfactory position accuracy.