[Discuss-gnuradio] Re: How to scan the whole ISM band?

[Goodman Roy]

I need time and power strength information to draw spectrogram. I have to finish this project as soon as possible, so I am looking for an easiest way to learn and solve this problem. I wonder if the following method can draw the spectrogram correctly. I really appreciate your help!

 

I run the command "./usrp_spectrum_sense.py -d 8 2400e6 2480e6", and then write the self.u into a file, "usrpoutput". Because I set the decimation equal to 8, there are 8M samples/sec at USB. I can get the interval between samples is 0.125usec(1/8=0.125). The self.u is in time domain. I can get the amplitude of the self.u from the file, usrpoutputand, and get the time index of self.u through n*0.125usec where n means nth sample.  I put the time and amplitude information into matlab and then I can draw the spectrogram using the command "spectrogram" in the matlab.

 

---------------------------------------- code ---------------------------------------------------------------

        self.u = usrp.source_c(fusb_block_size=options.fusb_block_size,
                               fusb_nblocks=options.fusb_nblocks)

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I need time and amplitude information to draw spectrogram. I have to finish this project as soon as possible, so I am looking for an easiest way to learn and solve this problem. I wonder if the above method can draw the spectrogram correctly. I really appreciate your help!

 

Thank you,

Roy