MOVABLE BODY POSITION MEASURING SYSTEM, CENTRAL PROCESSING UNIT, AND QUESTION CONTROL METHOD USED THEREIN

摘要

A movable body position measuring system includes at least one or more transmitting/receiving stations (1-1 to 1-5) that transmit question signals to movable bodies (aircrafts 5). The transmitting/receiving stations restrict the question signal transmission coverage to the question and response coverage of an SSR mode A/C that is a mode in which questions common to all movable bodies are made, while making individual questions of an SSR mode S that is a mode in which individual questions and responses can be made. A central processing unit (2) has a means for controlling the transmitting/receiving stations to make individual questions of the SSR mode S for the movable bodies in order of importance to air-traffic control, starting with a movable body having the highest importance. This provides a movable body position measuring system that can improve the reliability and safety of multi-lateration system.