Variable measurement rate method for positioning systems

A device comprising:

• a position module configured to (i) generate an intermediate signal conveying both a position of said device and a velocity of said device in response to a plurality of navigation signals received from external said device, (ii) measure both a first value of said position and a first vector of said velocity at a first time and (iii) measure a second value of said position at a second time;
• and
• a rate module configured to (i) calculate an extrapolated value of said position expected at said second time based on said first value and said first vector, (ii) adjust an interval between said second time and a third time in response to a difference between said extrapolated value and said second value and (iii) generate a position signal conveying said position and said velocity, wherein said third time occurs after said second time and said second time occurs after said first time.

A device comprising:

• means for (i) generating an intermediate signal conveying both a position of said device and a velocity of said device in response to a plurality of navigation signals received from external said device, (ii) measuring both a first value of said position and a first vector of said velocity at a first time and (iii) measuring a second value of said position at a second time;
• and
• means for (i) calculating an extrapolated value of said position expected at said second time based on said first value and said first vector, (ii) adjusting an interval between said second time and a third time in response to a difference between said extrapolated value and said second value and (iii) generating a position signal conveying said position and said velocity, wherein said third time occurs after said second time and said second time occurs after said first time.