GPS recording/replay with USRP1 and RFX1200
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GPS recording/replay with USRP1 and RFX1200
by Daniel Hooper
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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? Thanks, -- Daniel Hooper _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: GPS recording/replay with USRP1 and RFX1200
by Brian Padalino
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On Fri, Oct 30, 2009 at 12:06 PM, Daniel Hooper <enginerdy@...> 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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: GPS recording/replay with USRP1 and RFX1200
by Daniel Hooper
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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? Thanks On Fri, Oct 30, 2009 at 11:52 AM, Brian Padalino <bpadalino@...> wrote: > On Fri, Oct 30, 2009 at 12:06 PM, Daniel Hooper <enginerdy@...> 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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: GPS recording/replay with USRP1 and RFX1200
by Matt Ettus
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The RFX1800 is the best board to use for this. Matt Daniel Hooper wrote: > 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? > > Thanks > > > > On Fri, Oct 30, 2009 at 11:52 AM, Brian Padalino <bpadalino@...> wrote: >> On Fri, Oct 30, 2009 at 12:06 PM, Daniel Hooper <enginerdy@...> 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 >> > > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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