Method and apparatus for determining time in a satellite positioning system

An apparatus for determining a reference time associated with a satellite positioning system, said apparatus comprising:

• a storage unit, to store a set of position values, said position values to indicate a relative position of a set of satellites, and wherein each of said set of position values is associated with a time of measurement that differs from said reference time by an offset;
• and
• a processing unit, coupled to said storage unit, to determine said offset based on said set of position values and an estimate of a relative velocity of each of said set of satellites.

A method for determining time associated with a satellite positioning system, said method comprising the steps of:

• storing a value to indicate a velocity of at least one satellite;
• and
• determining said time based on said value.

A method for determining a time associated with a satellite positioning system, said method comprising the steps of:

• comparing a first record of at least a portion of a satellite message that is received by a first entity to a second record of said satellite message to determine a first time value, wherein said second record of said satellite message is received at a second entity;
• and
• determining a second time value based on a relative velocity of a set of satellites, wherein at least one of said first time value and said second time value indicates said time associated with said satellite positioning system.

A method for determining a time associated with a satellite positioning system, said method comprising the steps of:

• comparing a first record of at least a portion of a satellite message that is received by a first entity to a second record of said satellite message to determine a first time value, wherein said second record of said satellite message is received at a second entity;
• and
• determining a second time value based on a set of error statistic values, wherein at least one of said first time value and said second time value indicate said time associated with said satellite positioning system.