GPS recording/replay with USRP1 and RFX1200

GNU Radio
1

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 H.

2

On Fri, Oct 30, 2009 at 12:06 PM, Daniel H. [email protected]
wrote:

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

3

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 P. [email protected]
wrote:

Brian

–
Daniel H.

4

The RFX1800 is the best board to use for this.

Matt