Method and system for incorporating two-way ranging navigation as a calibration reference for GPS

摘要

A method and system for using two-way ranging navigation (10) to accurately determine the range along the path from source to destination by measuring the time delay during round-trip communication via satellite. The two-way ranging navigation measurements are used as calibration references, thereby improving the positioning accuracy of GPS (20). The system includes GPS (20) and a two-way ranging navigation system (10) for taking position measurements of a target (18). A correction factor (32) is determined as a function of the measurements and the GPS position is adjusted by the correction factor. The method for calibrating GPS using two-way ranging navigation involves taking a two-way ranging and navigation measurement and a GPS measurement of a target, determining a correction factor as a function of the measurements, and correcting the GPS position by taking a second GPS (10) measurement and adjusting it by the correction factor. <IMAGE>