Burst communications method and apparatus
First Claim
1. A transmitter comprising:
- a processor responsive to ephemeris data corresponding to an intended receiver, the processor being configured to compute an intended receiver spatial location at a future transmission time without receiving a communication from the intended receiver; and
a timing generator responsive to the processor, wherein the timing generator is configured to alter the future transmission time as a function of the intended receiver spatial location.
3 Assignments
0 Petitions
Accused Products
Abstract
A transmitter (400) offsets the transmission time and frequency of a burst transmission such that uncertainties in reception time and reception frequency are reduced. The transmitter includes an ephemeris store (454) that includes ephemeris data for one or more possible intended receivers (130). Orbits of possible intended receivers are propagated, and an intended receiver is selected. Transmission time offsets are generated as a function of transmitter location and intended receiver location. Transmission frequency offsets are substantially equal to a Doppler frequency derived from the transmitter velocity and the intended receiver velocity. Guard times and guard bands are reduced in size, resulting in greater available communications bandwidth and simpler receiver designs.
18 Citations
9 Claims
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1. A transmitter comprising:
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a processor responsive to ephemeris data corresponding to an intended receiver, the processor being configured to compute an intended receiver spatial location at a future transmission time without receiving a communication from the intended receiver; and
a timing generator responsive to the processor, wherein the timing generator is configured to alter the future transmission time as a function of the intended receiver spatial location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification