Low earth orbit satellite data uplink

A data uplink device comprising:

• an antenna adapted to:
• receive a low earth orbit (LEO) signal from a LEO satellite,
• receive first and second ranging signals from first and second ranging sources, respectively, and
• broadcast a data uplink signal to the LEO satellite;
• and
• a processor adapted to:
• determine position information using the LEO signal, the first ranging signal, and the second ranging signal,
• determine a timing advance parameter using a local clock reference and a LEO satellite clock reference,
• prepare the data uplink signal comprising uplink data to be broadcast to the LEO satellite, and
• synchronize the data uplink signal with the LEO satellite using the timing advance parameter.

A data uplink device comprising:

• means for determining position information using a LEO signal received from the LEO satellite, a first ranging signal received from a first ranging source, and a second ranging signal received from a second ranging source;
• means for determining a timing advance parameter using a local clock reference and a LEO satellite clock reference;
• means for preparing a data uplink signal comprising uplink data to be broadcast to the LEO satellite;
• means for synchronizing the data uplink signal with the LEO satellite using the timing advance parameter;
• and
• means for broadcasting the data uplink signal to the LEOsatellite.