AGPS - protocol specs?

Martin Lefkowitz lefko at
Thu Mar 8 19:59:54 CET 2007

Still confused on the term nearby GPS


Ian Stirling wrote:
> Martin Lefkowitz wrote:
>>> Message: 10
>>> Date: Thu, 08 Mar 2007 13:19:40 +0000
>>> From: Ian Stirling <openmoko at>
>>>   The gpsd will output assorted parameters, including current 
>>> position, ...
>>> You can take this - or even output from a nearby (1m) GPS, and the 
>>> bitstream input and output to the GPS chip, and try to work out what 
>>> the chip sends out.
>> I don't understand what is meant by a nearby (1m) GPS.  How does the 
>> device communicate with a nearby GPS?
> It doesn't - at all.
> However, in the absence of a GPS daemon that understands the chip 
> output, if the chip could just be turned on, the nearby GPS could be 
> used to determine (almost exactly) what signals are going into the 
> chip, which makes decoding the protocol easier.

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