This invention relates to improving the signal-to-noise ratio of semi-codeless tracking by presenting a method and apparatus which employs an optimal W-code timing pattern, and/or provides signal-to-noise gain by adding L1 and L2 W-code bit timing estimate signals before combining the L1 W-code estimate signal with the L2 W-code estimate signal.

 
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< Process for transmitting status messages to terminals of a satellite data transmission system, in particular in a satellite navigation system

< GPS carrier phase measurement representation and method of use

> Mobile telephone system capable of effectively utilizing GPS information even if direct reception by a mobile telephone apparatus is difficult

> Subscription system for GPS information
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