@Karl Koscher ok, I will try it this night, have a nice day as well :)
On Thu, Nov 19, 2015 at 10:47 PM, Karl Koscher <[email protected]> wrote: > Try specifying a receive frequency of 1.575 GHz with hackrf_transfer and > tell matlab your IF is 420 kHz. The sum of the two frequencies is 1.57542 > GHz, which is the L1 GPS frequency. > > On Thu, Nov 19, 2015 at 2:44 PM, mourad ghafiri <[email protected]> > wrote: > >> 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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