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Re: [Discuss-gnuradio] GPS recording/replay with USRP1 and RFX1200

From: Daniel Hooper
Subject: Re: [Discuss-gnuradio] GPS recording/replay with USRP1 and RFX1200
Date: Fri, 30 Oct 2009 12:42:42 -0500

Thank you for the tip. So people are definitely using USRP as a GPS
receiver with the DBSRX. I knew this was somewhere out there, but I
couldn't pin the location down.

As Feng pointed out to me, the RFX1200 does not have the proper
frequency range to record/transmit on the L1 frequency of 1575 MHz. My
understanding of GPS (fairly limited) says I need to handle a 2 MHz
bandwidth, or 1574-1576 MHz to read the C/A code. So the RFX1800
should be able to handle this?


On Fri, Oct 30, 2009 at 11:52 AM, Brian Padalino <address@hidden> wrote:
> On Fri, Oct 30, 2009 at 12:06 PM, Daniel Hooper <address@hidden> wrote:
>> I am putting together a production line test system (on a budget) for
>> a portable GPS device. Looking at my options for a GPS simulator, I'm
>> getting some very, very high dollar, hits -- totally outside my
>> budget.
>> HOWEVER, I do personally own a USRP1, and I was thinking that if I can
>> buy an RFX1200 to record and replay GPS signals, that would be
>> sufficient. I don't need anything fancy, just 'is the antenna
>> connected?' and 'will it obtain lock?' kinds of qualifications.
>> My question is, has anyone tried this? Does anyone have a good reason
>> why it wouldn't work?
> I've seen some of this and have found at least the following link:
>  http://www.gps-sdr.com/source/html/main.html
> The Git repo seems to be last updated in September, so still somewhat active.
> Hope this helps.
> Brian

Daniel Hooper

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