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Method of transmitting postion data from a mobile unit

  • US 20040266341A1
  • Filed: 08/31/2004
  • Published: 12/30/2004
  • Est. Priority Date: 05/31/2001
  • Status: Abandoned Application
First Claim
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1. A method of transmitting from a mobile unit position data derived from a grid coordinate system and defining unambiguously to a desired resolution a position of said unit within said coordinate system, wherein said position data is transmitted in the form of two messages spaced in time, one message comprising coordinate position data from which a lower order of data has been truncated whereby the one message defines an unambiguous position within said coordinate system at a resolution lower than said desired resolution, and the other message comprising coordinate position data from which a higher order of data has been truncated whereby the other message defines to the said desired resolution a position within said coordinate system that is ambiguous, the degree of truncation of the position data in each message being determined in accordance with a predetermined factor corresponding to a given distance within said coordinate system that is greater than the distance travelled by said mobile unit in the time space between said messages, whereby from the data of the two transmitted messages and the said predetermined factor, the position of the unit at the time of transmission of the said other message can be determined to said desired resolution.

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