2007/5/24, Ben Loftin <[EMAIL PROTECTED]>:
Trond,
> If anyone is interested, I have a complete coarse acquisition module
> written for GNU Radio. The source code is available from
> http://code.google.com/p/opengnss/. Some cleaning of the code is still
> required. You can find images of the current results here:
> http://trondd.blogspot.com/2007/05/opengnss-status.html
Awesome, I would like to try it out, what is the best way to get the needed
blocks assuming they are not in a patch already?
Any thoughts on the next step of tracking?
I want to try both the BASS tracking described by James Bao-Yen Tsui
in Fundamentals of Global Positioning System Receivers: A Software
Approach and a conventional PLL based tracking module.
But before I can get down to tracking, I have to implement the fine
frequency estimation.
Also, if I want to test it from my captured files would I change line 85 of
acquisition.py to pull from a file or is this done somewhere else. Thanks.
Take a look at the gr_gnss-acquistion-test.py script in the scripts
folder. Basically this is all you need:
file_src = gr.file_source(gr.sizeof_gr_complex,
"../data/L1-4MHz-svn1-nav.dat")
self.acquisition = acquisition(fs=fs, svn=1, alpha=alpha)
self.ca_sink = gr.vector_sink_f()
self.fd_sink = gr.vector_sink_f()
self.rmax_sink = gr.vector_sink_f()
self.connect( self.src, self.acquisition)
self.connect( (self.acquisition, 0), self.ca_sink )
self.connect( (self.acquisition, 1), self.fd_sink )
self.connect( (self.acquisition, 2), self.rmax_sink )
--
Trond Danielsen
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