Method and system for tracking satellites to locate unknown transmitting accurately
First Claim
1. In a satellite tracking system, a method of tracking a satellite comprising the steps of:
- transmitting a tracking signal from a transmitter having a known location to the satellite;
receiving and retransmitting the tracking signal at the satellite;
receiving the retransmitted tracking signal at at least one receiver having a known location;
determining time delay and Doppler shift of the tracking signal received at the at least one receiver; and
determining at least one of a position and velocity of the satellite based upon the determined time delay and Doppler shift.
1 Assignment
0 Petitions
Accused Products
Abstract
A satellite tracking system, including a terrestrial transmitter, a plurality of terrestrial receivers, and a controller/analyzer, operates in two modes. In an active mode, the transmitter emits a tracking signal within a spread spectrum to a satellite and at least one of the receivers receives the signal retransmitted by the satellite. The controller/analyzer then determines the satellite position and velocity from the received signal. In a passive mode, at least two receivers each receive a signal transmitted from the satellite during normal operation and the controller/analyzer determines the satellite position and velocity from the received signals. The satellite position and velocity can be used to determine the position of an unknown transmitter that causes interference at the satellite.
43 Citations
22 Claims
-
1. In a satellite tracking system, a method of tracking a satellite comprising the steps of:
-
transmitting a tracking signal from a transmitter having a known location to the satellite; receiving and retransmitting the tracking signal at the satellite; receiving the retransmitted tracking signal at at least one receiver having a known location; determining time delay and Doppler shift of the tracking signal received at the at least one receiver; and determining at least one of a position and velocity of the satellite based upon the determined time delay and Doppler shift. - View Dependent Claims (2, 3, 4)
-
-
5. In a satellite tracking system, a method of tracking a satellite comprising the steps of:
-
receiving at a plurality of receivers having known locations a signal from the satellite; transmitting the received signals to a central location; determining a difference in time delay and Doppler shift of the received signals at the central location; and determining at least one of a position and velocity of the satellite based upon the determined difference in time delay and Doppler shift. - View Dependent Claims (6, 7, 8, 9)
-
-
10. A satellite tracking system for tracking a satellite comprising:
-
means for transmitting a tracking signal to the satellite, the transmitting means having a known location; means for receiving the tracking signal retransmitted from the satellite, the first receiving means having a known location; means for controlling the transmitting means and receiving means; and means for determining at least one of a position and velocity of the satellite based upon the received retransmitted tracking signal. - View Dependent Claims (11, 12, 13)
-
-
14. A satellite tracking system for tracking a satellite comprising:
-
first means for receiving a signal transmitted from the satellite, the first receiving means having a known location; second means for receiving the signal transmitted from the satellite, the second receiving means having a known location; means for controlling the first receiving means and second receiving means; and means for determining at least one of a position and velocity of the satellite based upon the received signals. - View Dependent Claims (15, 16, 17)
-
-
18. A satellite tracking system operable in two modes for tracking a satellite comprising:
-
means for transmitting a tracking signal to the satellite, the transmitting means having a known location; first means for receiving a signal, including the tracking signal retransmitted from the satellite, the first receiving means having a known location; second means for receiving a signal, including the tracking signal retransmitted from the satellite, the second receiving means having a known location; means for controlling the transmitting means, first receiving means, and second receiving means; and means for determining at least one of a position and velocity of the satellite based upon at least one of the received retransmitted tracking signals. - View Dependent Claims (19, 20, 21, 22)
-
Specification