71 lines
2.1 KiB
Python
Executable File
71 lines
2.1 KiB
Python
Executable File
import time
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import pypredict
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import subprocess
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satellites = ['NOAA-18','NOAA-19','NOAA-15']
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freqs = [137912500, 137100000, 137620000]
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sample = '44100'
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wavrate='11025'
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def runForDuration(cmdline, duration):
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try:
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child = subprocess.Popen(cmdline)
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time.sleep(duration)
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child.terminate()
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except OSError as e:
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print "OS Error during command: "+" ".join(cmdline)
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print "OS Error: "+e.strerror
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def recordFM(freq, fname, duration):
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# still experimenting with options - unsure as to best settings
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cmdline = ['rtl_fm',\
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'-f',str(freq),\
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'-s',sample,\
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'-g','43',\
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'-F','9',\
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'-A','fast',\
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'-E','dc',\
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fname+'.raw']
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runForDuration(cmdline, duration)
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def transcode(fname):
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cmdline = ['sox','-t','raw','-r',sample,'-es','-b','16','-c','1','-V1',fname+'.raw',fname+'.wav','rate',wavrate]
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subprocess.call(cmdline)
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def decode(fname):
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cmdline = ['/root/atpdec-1.7/atpdec',fname+'.wav']
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subprocess.call(cmdline)
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def recordWAV(freq,fname,duration):
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recordFM(freq,fname,duration)
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transcode(fname)
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def spectrum(fname,duration):
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cmdline = ['rtl_power','-f','137000000:138000000:1000','-i','1m','-g','40',fname+'.csv']
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runForDuration(cmdline,duration)
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def findNextPass():
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predictions = [pypredict.aoslos(s) for s in satellites]
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aoses = [p[0] for p in predictions]
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nextIndex = aoses.index(min(aoses))
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return (satellites[nextIndex],\
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freqs[nextIndex],\
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predictions[nextIndex])
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while True:
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(satName, freq, (aosTime, losTime)) = findNextPass()
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now = time.time()
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towait = aosTime-now
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if towait>0:
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print "waiting "+str(towait)+" seconds for "+satName
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time.sleep(towait)
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# dir= sat name and filename = start time
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fname='./'+satName+'/'+str(aosTime)
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print "beginning pass "+fname+" predicted end "+str(losTime)
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recordWAV(freq,fname,losTime-aosTime)
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decode(fname) # make picture
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# spectrum(fname,losTime-aosTime)
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print "finished pass "+fname+" at "+str(time.time())
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time.sleep(60.0)
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