Low earth orbit satellite providing navigation signals
First Claim
1. A method of providing a low earth orbit (LEO) signal from a LEO satellite, the method comprising:
- providing a plurality of transmit channels over a plurality of transmit slots, wherein the transmit channels comprise a set of communication channels associated with a first set of the transmit slots and a set of navigation channels corresponding to unused communication capacity associated with a second set of the transmit slots;
generating a pseudo random noise (PRN) ranging overlay comprising a first navigation signal and a second navigation signal;
applying the PRN ranging overlay to the navigation channels to distribute the first navigation signal over a first set of the navigation channels and to distribute the second navigation signal over a second set of the navigation channels;
combining the communication channels and the first and second sets of navigation channels into a LEO signal; and
broadcasting the LEO signal from the LEO satellite, wherein the LEO signal is a composite LEO signal comprising the communication channels and the first and second sets of navigation channels.
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Abstract
Low earth orbit (LEO) satellites are used to provide navigation signals. In one embodiment, a method of providing a LEO signal from a LEO satellite includes providing a plurality of transmit channels over a plurality of transmit slots. The transmit channels comprise a set of communication channels and a set of navigation channels. The method also includes generating a first pseudo random noise (PRN) ranging overlay corresponding to a navigation signal. The method further includes applying the first PRN ranging overlay to a first set of the navigation channels. In addition, the method includes combining the communication channels and the navigation channels into a LEO signal. The method also includes broadcasting the LEO signal from the LEO satellite.
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Citations
29 Claims
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1. A method of providing a low earth orbit (LEO) signal from a LEO satellite, the method comprising:
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providing a plurality of transmit channels over a plurality of transmit slots, wherein the transmit channels comprise a set of communication channels associated with a first set of the transmit slots and a set of navigation channels corresponding to unused communication capacity associated with a second set of the transmit slots; generating a pseudo random noise (PRN) ranging overlay comprising a first navigation signal and a second navigation signal; applying the PRN ranging overlay to the navigation channels to distribute the first navigation signal over a first set of the navigation channels and to distribute the second navigation signal over a second set of the navigation channels; combining the communication channels and the first and second sets of navigation channels into a LEO signal; and broadcasting the LEO signal from the LEO satellite, wherein the LEO signal is a composite LEO signal comprising the communication channels and the first and second sets of navigation channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 26, 27)
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13. A low earth orbit (LEO) satellite comprising:
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an antenna adapted to broadcast a LEO signal from the LEO satellite; and a processor adapted to; provide a plurality of transmit channels over a plurality of transmit slots, wherein the transmit channels comprise a set of communication channels associated with a first set of the transmit slots and a set of navigation channels corresponding to unused communication capacity associated with a second set of the transmit slots, generate a pseudo random noise (PRN) ranging overlay comprising a first navigation signal and a second navigation signal, apply the PRN ranging overlay to the navigation channels to distribute the first navigation signal over a first set of the navigation channels and to distribute the second navigation signal over a second set of the navigation channels and combine the communication channels and the first and second sets of navigation channels into the LEO signal, wherein the LEO signal is a composite LEO signal comprising the communication channels and the first and second sets of navigation channels. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 28, 29)
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25. A low earth orbit (LEO) satellite comprising:
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means for providing a plurality of transmit channels over a plurality of transmit slots, wherein the transmit channels comprise a set of communication channels associated with a first set of the transmit slots and a set of navigation channels corresponding to unused communication capacity associated with a second set of the transmit slots; means for generating a pseudo random noise (PRN) ranging overlay comprising a first navigation signal and a second navigation signal; means for applying the PRN ranging overlay to the navigation channels to distribute the first navigation signal over a first set of the navigation channels and to distribute the second navigation signal over a second set of the navigation channels; means for combining the communication channels and the first and second sets of navigation channels into a LEO signal; and means for broadcasting the LEO signal from the LEO satellite, wherein the LEO signal is a composite LEO signal comprising the communication channels and the first and second sets of navigation channels.
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Specification