Appeal No. 2000-2085
Application No. 08/803,937
third ranging signal and receipt of the fourth
ranging signal; and
determining the position of the object
based on the first and second known locations of
the first and second satellites, respectively,
and the first and second delays.
8. A system for determining a position of an
object utilizing two-way ranging among a
plurality of satellites at known locations in
communication with a ground station, the system
comprising:
a first satellite communication transceiver
in a first orbit at a first known location for
providing a bidirectional communication path
between the first satellite communication
transceiver and the object wherein the first
satellite communication transceiver transmits a
first ranging signal to the object as directed
by the ground station and wherein the object
transmits a second ranging signal to the first
satellite communication transceiver in response
to the first ranging signal, and the first
satellite communication transceiver further for
providing a first unidirectional communication
path between the first satellite communication
transceiver and the object corresponding to the
first satellite communication transceiver
performing one of transmitting a third ranging
signal to the object and receiving a fourth
ranging signal from the object;
a second satellite communication
transceiver in a second orbit at a second known
location for providing a second unidirectional
communication path between the second satellite
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Last modified: November 3, 2007