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Re: [Discuss-gnuradio] Anyone do you know good GPS receiver Method?


From: Nick Foster
Subject: Re: [Discuss-gnuradio] Anyone do you know good GPS receiver Method?
Date: Fri, 25 Nov 2011 17:40:20 -0800

On Fri, Nov 25, 2011 at 7:01 AM, Nick Othieno <address@hidden> wrote:
> Hi Ryan,
>
> What did you use for your setup, ie daughterboards, antenna and LNA (if you
> do not mind my asking). I have been trying a setup for months that uses a
> DBSRX2 and a mighty mouse 2 antenna only, but I have never been able to
> acquire the L1 signal. I am wondering where I have gone wrong in the setup.

I've successfully used a DBSRX + active antenna to receive GPS signals
before. What software are you using to do the correlation and find the
L1 signal?

--n

>
> Nick
>
> On Fri, Nov 18, 2011 at 9:47 AM, Wolfarth, Ryan <address@hidden> wrote:
>>
>> Hi folks,
>>
>> My group is using USRPs to do the task Kouki described, although our flow
>> diagram is a little different.  We only use the USRP2 to receive the raw RF
>> data which is written to file.  This data is processed to the point where we
>> decode the navigation bits, but no position is ever found.  We're more
>> interested in the effects of ionosphere scintillations on GNSS signal
>> structure so we don't need to calculate antenna position.
>>
>> I can recommend two books that have helped me immensely.  The Kaplan "blue
>> book:"
>>
>>
>> http://www.amazon.com/Understanding-GPS-Principles-Applications-Second/dp/1580538940/ref=sr_1_1?ie=UTF8&qid=1321627222&sr=8-1
>>
>> And the Kaplan "blue book:"
>>
>> http://www.gpstextbook.com/
>>
>> I do know of a group that has used a USRP1 to develop a 4 channel L1
>> receiver, but they had to modify the FPGA to do all the real time
>> processing.  Let me know if you have additional questions!
>>
>> -Ryan
>>
>> On Fri, Nov 18, 2011 at 7:56 AM, Brian Padalino <address@hidden>
>> wrote:
>>>
>>> 2011/11/18 山本弘貴 <address@hidden>:
>>> > Hi, All
>>> > I have  very trouble
>>> > My experiment enviroment isUBUNTU 11.04 , USRP N200, DBSRX2 ,active
>>> > antenna and gnuradio
>>> > I am worrying about good software GPS receiver is not exist .
>>> > I want to receive L1 signal , and want to demodulate that signal
>>> > However GPS signal is used  Spread spectrum modulation scheme.
>>> > I try to creating gnuradio-companion's blocks.(use to Spread spectrum
>>> > demodulation blocks)
>>> > but that is very difficult so Now I think method is
>>> >
>>> >  GPS L1 signal → USRP N200 → gnuradio-companion(UHD_source→File_sink)
>>> > → software decode soft → output(Location data)
>>> >
>>> >
>>> > Eventually I want to Calculate location data,
>>> > Please let me know if you're a good this way
>>>
>>> I recently came across this product listing at Spark Fun:
>>>
>>>    http://www.sparkfun.com/products/10981
>>>
>>> Which has a link to a book all about GPS receiving and even comes with
>>> MATLAB source code:
>>>
>>>
>>>  
>>> http://www.amazon.com/Software-Defined-GPS-Galileo-Receiver-Single-Frequency/dp/0817643907
>>>
>>> I am sure, with the source, you could adapt it to use the USRP
>>> recorded signal, and then possibly port the MATLAB over to either
>>> Python (using Josh's signal processing in Python blocks) or straight
>>> C++.
>>>
>>> > I am sorry that My English is not good
>>> >
>>> > Kouki
>>>
>>> Good luck - it's definitely not a trivial task, but it sounds extremely
>>> fun.
>>>
>>> Brian
>>>
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>>
>>
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