Position location of multiple transponding platforms and users using two-way ranging as a calibration reference for GPS

A method for locating the position of a target, comprising the steps of:

• a) taking a first global positioning system measurement of the target at a first predetermined period of time;
• b) taking a two way ranging navigation measurement of the target at said first predetermined period of time, said two way ranging navigation system comprising:
• i) at least one ground station;
• ii) a plurality of transponding platforms in communication with said ground station through a first link;
• and
• iii) a target in communication with said transponding platforms through a second link, said first and second links defining a path for carrying transmissions including a unique coded signal wherein each said path is a two way communication network between one of said plurality of transponding platforms, said ground station and said target, said communication network includes ranging determination for said target with respect to at least two of said paths including a transmission with said unique coded signal portion;
• c) determining a correction factor as a function of said two-way ranging navigation measurement and said global positioning system measurement;
• and
• d) obtaining a corrected global positioning system measurement by taking a second global positioning system measurement of said target at a second predetermined time and adjusting said second global positioning system measurement by said correction factor.