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US 10,218,408 B1Granted
Synchronized CPDMA (code phase division multiple access)
AssigneeHigher Ground LLC
InventorsShmuel Shaffer, Bruce Leonard McKinley, Scott A. McDermott
Life of this patent
Estimating the term…
Abstract
A communications protocol in accordance with one exemplary embodiment uses information from GPS satellites to synchronize the phases of transmitters, and aligns the phase with a spreading code used to de-spread the received signals at, for example, a ground station.
Claims13
A communications system comprising:
- a location determining module adapted to determine a location of one or more of a terminal and a geostationary communications satellite;
- and
- an alignment module, the alignment module at least in communication with and at least using information corresponding to the determined location from the location determining module to align arrival code-phases of signals for a ground station receiver by altering a clock for a modulated signal transmitted from the terminal,
- wherein the alignment module:
- determines an alignment time and aligns a code-phase of a spreading code on a clock tick boundary, wherein the determining of the alignment time includes:
- determining a geographic position of the terminal;
- determining a position of the communications satellite;
- determining a distance between the terminal and the communications satellite;
- and
- adjusting a starting time of the spreading code by a function of a communications signal travel distance modulo predetermined time period.
7 more elements
A communications method for a communications terminal comprising:
- determining a location of one or more of the communications terminal and a geostationary communications satellite;
- using information corresponding to the determined location to align arrival code-phases of signals as a ground station receiver;
- and
- determining an alignment time and aligning a code-phase of a spreading code on a clock tick boundary for a signal transmitted from the terminal, wherein the determining of the alignment time includes:
- determining a geographic position of the terminal;
- determining a position of the communications satellite;
- determining a distance between the terminal and the communications satellite;
- and
- adjusting a starting time of the spreading code by a function of a communications signal travel distance modulo predetermined time period.
6 more elements
A communications method for a communications terminal comprising:
- determining a location of one or more of the communications terminal and a geostationary communications satellite;
- using information corresponding to the determined location to align arrival code-phases of signals at a ground station receiver;
- and
- determining an alignment time and aligning a code-phase of a spreading code on a clock tick boundary for a signal transmitted from the terminal, wherein the determining of the alignment time includes:
- determining a geographic position of the terminal;
- determining a position of the communications satellite;
- determining a distance between the terminal and the communications satellite;
- and
- adjusting a starting time of the spreading code by a function of a distance the communications signal travels from the terminal to the communications satellite modulo predetermined time period.
6 more elements
A communications method for a communications terminal comprising:
- determining a location of one or more of the communications terminal and a geostationary communications satellite;
- using information corresponding to the determined location to align arrival code-phases of signals at a ground station receiver;
- and
- determining an alignment time and aligning a code-phase of a spreading code on a clock tick boundary for a signal transmitted from the terminal, wherein the determining of the alignment time includes:
- determining a geographic position of the terminal;
- a determining a geographic position of the ground station receiver;
- determining a position of the communications satellite;
- determining a distance between the terminal and the communications satellite;
- determining a distance between the ground station receiver and the communications satellite;
- establishing a total distance a signal traverses by adding the distance between the terminal and the communications satellite and the distance between a ground station receiver and the communications satellite;
- and
- adjusting a starting time of the spreading code by a function of a communications signal travel distance modulo predetermined time period.
9 more elements
Dependencies are inferred from the claim text.