METHOD FOR OBTAINING RECIPROCATING DELAY TIME (RTD) FOR RATIO TERMINAL OF WIRELESS NETWORK GLOBAL POSITIONING INTEGRATING (WGP) SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a method by which a bias parameter is adaptively adjusted in accordance with a possible change by automatically measuring an RTD parameter (bias) used in a WGP system and continuously improving the quality of estimation.;SOLUTION: In this method, the estimated amount of the RTD parameter is obtained by using a radio terminal which can receive superior GPS signals without requiring the setting of a specific system for calibration nor calibration by means of many skilled persons at a job site and a previously obtained parameter stored in a data base is updated by using the estimated RTD parameter. The estimated RTD parameter is used at the time of deciding the position where the ratio terminal is not able to receive the superior GPS signals based on the information obtained from a radio network.;COPYRIGHT: (C)2002,JPO