Created
November 10, 2019 08:53
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NOAA Captures
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import time | |
import pypredict | |
import subprocess | |
satellites = ['NOAA-18','NOAA-19','NOAA-15'] | |
freqs = [137912500, 137100000, 137620000] | |
sample = '44100' | |
wavrate='11025' | |
def runForDuration(cmdline, duration): | |
try: | |
child = subprocess.Popen(cmdline) | |
time.sleep(duration) | |
child.terminate() | |
except OSError as e: | |
print "OS Error during command: "+" ".join(cmdline) | |
print "OS Error: "+e.strerror | |
def recordFM(freq, fname, duration): | |
# still experimenting with options - unsure as to best settings | |
cmdline = ['rtl_fm',\ | |
'-f',str(freq),\ | |
'-s',sample,\ | |
'-g','43',\ | |
'-F','9',\ | |
'-A','fast',\ | |
'-E','dc',\ | |
fname+'.raw'] | |
runForDuration(cmdline, duration) | |
def transcode(fname): | |
cmdline = ['sox','-t','raw','-r',sample,'-es','-b','16','-c','1','-V1',fname+'.raw',fname+'.wav','rate',wavrate] | |
subprocess.call(cmdline) | |
def decode(fname): | |
cmdline = ['/root/atpdec-1.7/atpdec',fname+'.wav'] | |
subprocess.call(cmdline) | |
def recordWAV(freq,fname,duration): | |
recordFM(freq,fname,duration) | |
transcode(fname) | |
def spectrum(fname,duration): | |
cmdline = ['rtl_power','-f','137000000:138000000:1000','-i','1m','-g','40',fname+'.csv'] | |
runForDuration(cmdline,duration) | |
def findNextPass(): | |
predictions = [pypredict.aoslos(s) for s in satellites] | |
aoses = [p[0] for p in predictions] | |
nextIndex = aoses.index(min(aoses)) | |
return (satellites[nextIndex],\ | |
freqs[nextIndex],\ | |
predictions[nextIndex]) | |
while True: | |
(satName, freq, (aosTime, losTime)) = findNextPass() | |
now = time.time() | |
towait = aosTime-now | |
if towait>0: | |
print "waiting "+str(towait)+" seconds for "+satName | |
time.sleep(towait) | |
# dir= sat name and filename = start time | |
fname='./'+satName+'/'+str(aosTime) | |
print "beginning pass "+fname+" predicted end "+str(losTime) | |
recordWAV(freq,fname,losTime-aosTime) | |
decode(fname) # make picture | |
# spectrum(fname,losTime-aosTime) | |
print "finished pass "+fname+" at "+str(time.time()) | |
time.sleep(60.0) |
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