Monthly Archives: January 2009

FFTW

I downloaded and installed FFTW as a library to provide FFT routines for the acquisition stage.
To convert the definition files to libraries I followed the instructions provided on the following website.
http://www.fftw.org/install/windows.html
I had to run the Visual Studio 2008 command prompt to allow correct access to the Lib.exe file.
I also ran into problems with VS2008 incorrectly [...]

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Aquisition of GPS

From a previous post the basic GPS signal is as follows.

Let be the CA code transmitted by the satellite and be the CA code created by the receiver.
As
can only possibly change after C(t) is repeated 20 times it will be thought of as a constant.
All constants will be dropped or added as [...]

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Basic GPS Signal Information

GPS L1 Signal can be represented from the following components
is a C/A signal component.  The C/A component is a repeating Gold Code 1023 units long with at a frequency of 1.023 MHz.   These units are called chirps rather than bits to emphasize that no data is transmitted through them.
 is the information carrying part [...]

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GN3S v2 streamer problems - buffer overrun…

I tested the dongle at school and it worked fine.  I installed a usb2 card in my pc at home and this removed the interface2 error.  However i belive my home PC has problems with the bus as I now get buffer overruns.
E:\temp\senior proj\GN3Sv2\Application>gn3sv2 -s 625
 ———-
 GN3S v2 - GNSS IF Streamer for Windows
 ———-
Saving data to [...]

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Problems with Obtaining new dataset.

Tried the GN3Sv2 on my home pc.
It has usb 1, but am getting an error as follows.
error in usb_fx2_configure,
usb_claim_interface: could not claim interface 2, win error: The parameter is in
correct.
Device not programmed_
When the device is not plugged in the following error occures.
Could not find an EK3 device
Need to find a computer with usb2 to test [...]

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