Modulation signals for a satellite navigation system
AssigneeThe Secretary of State of Defence
InventorsAnthony Pratt, John Owen
Life of this patent
Estimating the term…
Abstract
I Embodiments of the present invention relate to a modulation system in which an m-level, m>2, digital subcarrier is used to modulate a signal.
Claims32
A method of generating a transmission signal comprising a carrier signal, the method comprising the step of multiplying the carrier signal by at least one subscriber modulation signal;
- wherein the at least one subscriber modulation signal comprises a number, m, of amplitude levels, where m>2.
2-3. (canceled)
(canceled)
An m-level subcarrier modulation signal comprising m signal amplitudes, where m>2, for modulating a first signal.
A signal as claimed in 23 wherein, the m signal amplitudes are, or are in proportion to, at least one of the following sets of amplitudes {+1, +1/√2, 0, −1/√2, −1}, {−√3/2, −1/2, +1/2, +√3/2}, {(±sin(67.5°), ±sin(22.5°), ±sin(22.5°), ±sin(67.5°)}, {±cos(67.5°), ±cos(22.5°), ±cos(22.5°), ±cos(67.5°)}.
31-95. (canceled)
Dependencies are inferred from the claim text.