[time-nuts] GPS first LO need to be locked?

[jimlux]

On 4/3/17 9:32 PM, Logan Cummings wrote:
> Dave,
>
>     I was able to find [2] here:
> http://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Akos_IONGPS_2003_3FreqRX.pdf
>


So those folks were trying to use 1 ADC for all three bands, so they had 
to choose a sampling rate that lets them separate the signals later in 
software.

But that ADC is a MAX104 - a 1GSPS, 8 bit converter - that draws 5 Watts!!!

I'm not sure that's a good trade against a 1 or 2 bit converter for each 
band, in terms of the downstream data rate and processing.





> [3] was harder, and I don't have a link but a google search for the title
> in quotes got me a link on semanticscholar that let me download the PDF.
>
> Interesting stuff!
>
> Hope that helps,
> -Logan
>
> On Fri, Mar 31, 2017 at 9:17 AM, David C. Partridge <
> david.partridge at perdrix.co.uk> wrote:
>
>> links [2] and [3] give 404 errors
>>
>> Dave
>>
>> -----Original Message-----
>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Attila
>> Kinali
>> Sent: 31 March 2017 12:35
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] GPS first LO need to be locked?
>>
>>  [2] "A Prototyping Platform for Multi-Frequency GNSS Receivers", by Akos,
>> Ene and Thor, 2003 http://waas.stanford.edu/~wwu/papers/gps/PDF/
>> AkosIONGPS033FreqRX.pdf
>>
>> [3] "Design of a GPS and Galileo Multi-Frequency Front-End", by Parada,
>> Chastellain, Botteron, Tawk, Farine, 2009 http://202.194.20.8/proc/
>> VTC09Spring/DATA/04-04-01.PDF
>>
>>
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