[Discuss-gnuradio] usrp_spectrum_sense.py

[cbwangmail]

hi everyone:

i have a problem about usrp_spectrum_sense.py .i want to implement a spectrum sense to environment with the resolution 25Khz,

but i don't kown how can i adjust the parameters in the usrp_spectrum_sense.py.here is some codes about the parameters:

 

parser = OptionParser(option_class=eng_option, usage=usage)
        parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0,0),
                          help="select USRP Rx side A or B (default=A)")
        parser.add_option("-g", "--gain", type="eng_float", default=None,
                          help="set gain in dB (default is midpoint)")
        parser.add_option("", "--tune-delay", type="eng_float", default=1e-3, metavar="SECS",
                          help="time to delay (in seconds) after changing frequency [default=%default]")
        parser.add_option("", "--dwell-delay", type="eng_float", default=10e-3, metavar="SECS",
                          help="time to dwell (in seconds) at a given frequncy [default=%default]")
        parser.add_option("-F", "--fft-size", type="int", default=256,
                          help="specify number of FFT bins [default=%default]")
        parser.add_option("-d", "--decim", type="intx", default=128,
                          help="set decimation to DECIM [default=%default]")
        parser.add_option("", "--real-time", action="", default=False,
                          help="Attempt to enable real-time scheduling")
        parser.add_option("-B", "--fusb-block-size", type="int", default=0,
                          help="specify fast usb block size [default=%default]")
        parser.add_option("-N", "--fusb-nblocks", type="int", default=0,
                          help="specify number of fast usb blocks [default=%default]")

 

 

 

        self.freq_step =   usrp_rate / 20 

        self.min_center_freq = self.min_freq + self.freq_step/2
        nsteps = math.ceil((self.max_freq - self.min_freq) / self.freq_step)
        self.max_center_freq = self.min_center_freq + ((nsteps-1) * self.freq_step)

        self.next_freq = self.min_center_freq

 

it looks i can get the output with the resolution 25Khz ,but  the problem is when i send a signal with the frequent point 430M,

bandwidth 50Khz ,running the usrp_spectrum_sense.py, i can get a change in the 430Mhz,but the bandwidth is bigger than 50Khz(about 400Khz),so what should i do with this problem?

thanks in advance!

 

 

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