Method and system for determining a position of a transceiver unit utilizing two-way ranging in a polystatic satellite configuration including a ground radar

摘要

A method and system for determining the position of an object (12), such as an aircraft, utilizes two-way ranging with a polystatic satellite configuration and ground radar (13). A ground transceiver (13) at a first known location provides a bidirectional communication path between the ground transceiver (13) and the object (12) wherein the ground transceiver (13) transmits a first ranging signal to the object (12) and the object (12) transmits a second ranging signal to the ground transceiver (13) in response to the first ranging signal. A first communication transceiver (11) at a second known location provides a first unidirectional communication path (R3) between the first communication transceiver (11) and the object (12) wherein the first communication transceiver (11) performs one of transmitting a third ranging signal to the object (12) and receiving a third ranging signal from the object (12) in response to the first ranging signal. A second communication transceiver (11) is arranged at a third known location for providing a second unidirectional communication path (R4) between the second communication transceiver (11) and the object (12) wherein the second communication transceiver (11) performs one of transmitting a fourth ranging signal to the object (12) and receiving a fourth ranging signal from the object (12) in response to the first ranging signal. A signal processor (13, 14, 16) determines a first, second and third path length, and determines the position of the object (12) based on the first, second and third known locations and the first, second and third path lengths.