even I need the IF it in the matlab project :) , so what value I should put there, I will experiment the hackrf_transfer program and see to what extent I will get the desired results.. and for sure I will share my results with you and for the hackrf community as a contribution for GPS signal decoding, if I do it myself :)
On Thu, Nov 19, 2015 at 10:40 PM, Karl Koscher <[email protected]> wrote: > Just specify the frequency you want to tune to with -f. You shouldn't need > to specify -i. > > On Thu, Nov 19, 2015 at 2:29 PM, mourad ghafiri <[email protected]> > wrote: > >> @Karl Koscher >> >> I used the Gnu radio, I will use the hackrf_transfer , but please would >> you help for IF parameter >> [-i if_freq_hz] # Intermediate Frequency (IF) in Hz [2150MHz to 2750MHz] >> ? >> >> I don't know what to set for IF since I need to tune hackrf at 1.575 GHz >> and Bandwidth of 2 MHz and a sampling rate > 2*2 MHz >> >> would you give me a complete command for these requirements, >> >> Thank you so much in advance >> >> Regards; >> >> >> On Thu, Nov 19, 2015 at 10:22 PM, Karl Koscher < >> [email protected]> wrote: >> >>> How doesn't it work? You should probably just use the hackrf_transfer >>> program to record data from the HackRF. By default, it stores data in >>> complex int8 format. >>> >>> On Thu, Nov 19, 2015 at 2:18 PM, mourad ghafiri < >>> [email protected]> wrote: >>> >>>> @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 < >>>> [email protected]> 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 < >>>>> [email protected]> 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 < >>>>>> [email protected]> 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 < >>>>>>> [email protected]> 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 < >>>>>>>> [email protected]> 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 < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> How are you recording the samples? >>>>>>>>>> >>>>>>>>>> On Thu, Nov 19, 2015 at 1:05 PM, mourad ghafiri < >>>>>>>>>> [email protected]> 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 >>>>>>>>>>> [email protected] >>>>>>>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
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