diff options
Diffstat (limited to 'gsm-tvoid/src/python/gsm_scan.py')
| -rwxr-xr-x | gsm-tvoid/src/python/gsm_scan.py | 99 |
1 files changed, 46 insertions, 53 deletions
diff --git a/gsm-tvoid/src/python/gsm_scan.py b/gsm-tvoid/src/python/gsm_scan.py index 9d5cbcf..6e09f7f 100755 --- a/gsm-tvoid/src/python/gsm_scan.py +++ b/gsm-tvoid/src/python/gsm_scan.py @@ -31,19 +31,37 @@ class burst_callback(gr.feval_ll): def __init__(self, fg): gr.feval_ll.__init__(self) self.fg = fg - + self.offset_mean_num = 30 #number of FCCH offsets to average + self.offset_vals = [] + def eval(self, x): try: - #print "burst_callback: ", x, "\n"; - if gsm.BURST_CB_ADJ_OFFSET == x: - #return 0 - #TODO: rework so this will work on file input + #TODO: rework so this will work on file input + if gsm.BURST_CB_SYNC_OFFSET == x: + last_offset = self.fg.burst.last_freq_offset() + self.fg.offset -= last_offset + print "burst_callback: SYNC_OFFSET:", last_offset, " ARFCN: ", self.fg.arfcn, "\n"; + self.fg.set_channel(self.fg.arfcn) + + elif gsm.BURST_CB_ADJ_OFFSET == x: last_offset = self.fg.burst.last_freq_offset() - if 20000.0 > abs(last_offset) > 500.0: - self.fg.offset -= last_offset - print "burst_callback: ADJ_OFFSET:", last_offset, " ARFCN: ", self.fg.arfcn, "\n"; - self.fg.set_channel(self.fg.arfcn) + #print "burst_callback: ADJ_OFFSET:", last_offset, " ARFCN: ", self.fg.arfcn, "\n"; + self.offset_vals.append(last_offset) + + if len(self.offset_vals) >= self.offset_mean_num: + sum = 0.0 + while len(self.offset_vals): + sum += self.offset_vals.pop(0) + + mean_offset = sum / self.offset_mean_num + self.fg.offset -= mean_offset + + #retune if greater than 100 Hz + if mean_offset > 100.0: + print "burst_callback: mean offset:", mean_offset, "\n"; + self.fg.set_channel(self.fg.arfcn) + elif gsm.BURST_CB_TUNE == x: print "burst_callback: BURST_CB_TUNE: ARFCN: ", self.fg.burst.next_arfcn, "\n"; self.fg.set_channel(self.fg.burst.next_arfcn) @@ -196,25 +214,25 @@ class app_flow_graph(stdgui.gui_flow_graph): sps = input_rate/gsm_symb_rate - # Attempt to enable realtime scheduling - r = gr.enable_realtime_scheduling() - if r == gr.RT_OK: - realtime = True - print "Realtime scheduling ENABLED" - else: - realtime = False - print "Realtime scheduling FAILED" - -# if options.fusb_block_size == 0 and options.fusb_nblocks == 0: - if realtime: # be more aggressive - options.fusb_block_size = gr.prefs().get_long('fusb', 'rt_block_size', 1024) - options.fusb_nblocks = gr.prefs().get_long('fusb', 'rt_nblocks', 16) - else: - options.fusb_block_size = gr.prefs().get_long('fusb', 'block_size', 4096) - options.fusb_nblocks = gr.prefs().get_long('fusb', 'nblocks', 16) - - print "fusb_block_size =", options.fusb_block_size - print "fusb_nblocks =", options.fusb_nblocks +# # Attempt to enable realtime scheduling +# r = gr.enable_realtime_scheduling() +# if r == gr.RT_OK: +# realtime = True +# print "Realtime scheduling ENABLED" +# else: +# realtime = False +# print "Realtime scheduling FAILED" +# +# # if options.fusb_block_size == 0 and options.fusb_nblocks == 0: +# if realtime: # be more aggressive +# options.fusb_block_size = gr.prefs().get_long('fusb', 'rt_block_size', 1024) +# options.fusb_nblocks = gr.prefs().get_long('fusb', 'rt_nblocks', 16) +# else: +# options.fusb_block_size = gr.prefs().get_long('fusb', 'block_size', 4096) +# options.fusb_nblocks = gr.prefs().get_long('fusb', 'nblocks', 16) +# +# print "fusb_block_size =", options.fusb_block_size +# print "fusb_nblocks =", options.fusb_nblocks # Build the flowgraph # Setup our input source @@ -302,31 +320,6 @@ class app_flow_graph(stdgui.gui_flow_graph): self.clocked_scope = scopesink.scope_sink_f(self, panel, sample_rate=gsm_symb_rate,v_scale=1) self.connect(self.clocker, self.clocked_scope) - elif options.decoder.count("F"): - #configure clock recovery - gain_mu = 0.01 - gain_omega = .25 * gain_mu * gain_mu # critically damped - self.clocker = gr.clock_recovery_mm_cc( sps, - gain_omega, - 0.5, #mu - gain_mu, - 0.3) #omega_relative_limit, - - - # configure demodulator - self.demod = gr.quadrature_demod_cf(1); - - self.burst = gsm.burst_ff() - self.connect(self.filter, self.clocker, self.demod, self.burst) - - if self.scopes.count("d"): - self.demod_scope = scopesink.scope_sink_f(self, panel, sample_rate=input_rate) - self.connect(self.demod, self.demod_scope) - - if self.scopes.count("c"): - self.clocked_scope = scopesink.scope_sink_f(self, panel, sample_rate=gsm_symb_rate,v_scale=1) - self.connect(self.clocker, self.clocked_scope) - # setup decoder parameters # equalizer |