[Hackrf-dev] how to set IF in GNU Radio for HackRF

[mourad ghafiri]

@Karl Koscher

unfortunately the approach doesn't function well... please any hint to
achieve that  goal which is:

having an GPS L1 signal streaming for post processing with matlab/octave ?
we have HackRF and a GPS L1 antenna ... but we don't have enough knowledge
in hardware side, but we do know how to manipulate a file streaming with
float or int8 matrix data in Matlab/octave.

Yours Sincerely;

On Thu, Nov 19, 2015 at 10:11 PM, mourad ghafiri <mourad.ghafiri at gmail.com>
wrote:

> @David Brown
>
> I appreciate your interaction with that basic question, in fact we are
> recording a L1 GPS streaming for post processing in a Matlab project for
> GPS positioning... so all we need simply is a file that contain an int8
> type record.
>
> @Karl Koscher
>
> thank you so much, I will try this blocks Immediately and get back to you;
> if you still have time to complete this friendly (hackerfly :) )
> conversation.
>
> On Thu, Nov 19, 2015 at 10:04 PM, Karl Koscher <supersat at cs.washington.edu
> > wrote:
>
>> Use a Complex to Float/Real and Float to Char type converter block
>> between the HackRF source block and the file sink, and then change the file
>> sync type to char. Or you can use the hackrf_transfer program and avoid
>> these conversions altogether.
>>
>> On Thu, Nov 19, 2015 at 1:49 PM, mourad ghafiri <mourad.ghafiri at gmail.com
>> > wrote:
>>
>>> thank you  for your quick answer, please how to record the streaming in
>>> int8 type
>>>
>>> Regards;
>>>
>>> On Thu, Nov 19, 2015 at 9:40 PM, Karl Koscher <
>>> supersat at cs.washington.edu> wrote:
>>>
>>>> You are recording complex floats. The intermediate frequency is your
>>>> frequency of interest minus what the HackRF is tuned to. If your HackRF is
>>>> tuned to 1.575 GHz but you want to decode the GPS L1 signal, then your IF
>>>> is 420 kHz.
>>>>
>>>> On Thu, Nov 19, 2015 at 1:36 PM, mourad ghafiri <
>>>> mourad.ghafiri at gmail.com> wrote:
>>>>
>>>>> I attached the flow graph for the recording as well as a real time
>>>>> spectrum , I'm not sure what blocks to use or what parameters to set for
>>>>> this block in order to have the right streaming.
>>>>> thanks for showing interest to the question
>>>>>
>>>>> On Thu, Nov 19, 2015 at 9:16 PM, Karl Koscher <
>>>>> supersat at cs.washington.edu> wrote:
>>>>>
>>>>>> How are you recording the samples?
>>>>>>
>>>>>> On Thu, Nov 19, 2015 at 1:05 PM, mourad ghafiri <
>>>>>> mourad.ghafiri at gmail.com> wrote:
>>>>>>
>>>>>>> Hello;
>>>>>>>
>>>>>>> please any help to figure out what is the Intermediate Frequency
>>>>>>> used for HackRF in Gnuradio...
>>>>>>>
>>>>>>> I'm recording a streaming file for GPS and I don't know what is the
>>>>>>> appropriate type ( int; float...) and what is the appropriate IF to use in
>>>>>>> order to process that streaming in Matlab.
>>>>>>>
>>>>>>> Best Regards;
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> HackRF-dev mailing list
>>>>>>> HackRF-dev at greatscottgadgets.com
>>>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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