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CIR scripts
===========
This is a set of script to do correlation measurement measurements
of a DAB signal. These scripts can be used to do channel impulse
response measurements using a RTLSDR receiver.
Right now there are three scripts:
* correlate_with_ref.py: Finds the NULL symbol of an IQ file, and runs
correlations against the known phase reference to find the components.
* simulate_channel.py: Reads an I/Q file generated by ODR-DabMod and
adds some additional components, somehow equivalent to signal reflexions.
Each reflexion has a delay and an amplitude factor.
* cir_measure.py: Runs a small webserver that does the correlation
all the time and updates a webpage (INCOMPLETE! NOT FUNCTIONAL!)
Example image: 
The image shows the received CIR of a real DAB signal captured with the RTLSDR.
To read in a recording using a RTL-SDR receiver, use:
rtl_sdr -f 188928000 -s 2048000 -g 20 -S - | \
dd of=DAB_9A_10_u8_G20.iq bs=2 count=1966080
replace 1966080 (ten Mode 1 transmission frames) by a larger value if you want.
Then feed the data to the script
./correlate_with_ref.py u8 DAB_9A_10_u8_G20.iq
Requirements
------------
Python with NumPy and matplotlib
The iq files must be complex float or interleaved unsigned 8-bit.
Licence
-------
MIT. See LICENCE for details.
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